A piece of magnesium ribbon was heated to redness in an atmosphere of nitrogen and then cooled with water. The gas evolved is

A piece of magnesium ribbon was heated to redness in an atmosphere of nitrogen and then cooled with water. The gas evolved is
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A piece of magnesium ribbon was heated to redness in an atmosphere of nitrogen and then cooled with ... . ammonia B. hydrogen C. nitrogen D. oxygen
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0.257g of organic substance was heated with conc. sulphuric acid and then distilled with excess of strong alkali .the ammonia gas evolved was absorbed in 50ml of .1M HCl which required 23.2ml of c for neutralization at the end of the process. Determine the % of nitrogen in the compound ?

Description : 0.257g of organic substance was heated with conc. sulphuric acid and then distilled with excess of strong alkali .the ammonia gas evolved was absorbed in 50ml of .1M HCl which required 23.2ml of c for neutralization at the end of the process. Determine the % of nitrogen in the compound ?

Last Answer : A. Vol of 0 .1M HCl taken = 50ml Vol of .1MNaOH used for neutralization of unused acid=23.2ml Now, 23.2 ml of .1MNaOH =23.2ml of .1MHCl Vol of .1MHCl unused=23.2ml Vol of .1MHCl required ... NH3 solution contain nitrogen = 14*26.8/10*1000 Percentage of Nitrogen=14*26.8*100/10*1000*.257 =14.6%

In a gas-liquid shell and tube heat exchanger, the(A) Presence of a non-condensable gas decreases the condensing film co￾efficient (B) Gases under high pressure are routed through the tube side, because high pressure gases are corrosive in nature (C) Gases to be heated/cooled is normally routed through the shell side, because the corrosion caused by the cooling water or steam condensate remain localised to the tubes (D) All 'a', 'b' & 'c'

Description : In a gas-liquid shell and tube heat exchanger, the (A) Presence of a non-condensable gas decreases the condensing film co￾efficient (B) Gases under high pressure are routed through the tube side, because high pressure ... water or steam condensate remain localised to the tubes (D) All 'a', 'b' & 'c'

Last Answer : (D) All 'a', 'b' & 'c'

The gas used in a refrigerator is - (1) cooled down on flowing (2) heated up on flowing (3) cooled down when compressed (4) cooled down when expanded

Description : The gas used in a refrigerator is - (1) cooled down on flowing (2) heated up on flowing (3) cooled down when compressed (4) cooled down when expanded

Last Answer : (4) cooled down when expanded Explanation: Common refrigerants used in various applications are ammonia, sulfur dioxide, and non-halogenated hydrocarbons such as propane. Compressing these gasses into liquids they are made to give up their heat.

Pick out the correct statement. (A) A real gas on expansion in vacuum gets heated up (B) An ideal gas on expansion in vacuum gets cooled (C) An ideal gas on expansion in vacuum gets heated up (D) A real gas on expansion in vacuum cools down whereas ideal gas remains unaffected

Description : Pick out the correct statement. (A) A real gas on expansion in vacuum gets heated up (B) An ideal gas on expansion in vacuum gets cooled (C) An ideal gas on expansion in vacuum gets heated up (D) A real gas on expansion in vacuum cools down whereas ideal gas remains unaffected

Last Answer : (D) A real gas on expansion in vacuum cools down whereas ideal gas remains unaffecte

Dinitrogen gas is evolved when sodium nitrite is heated below `500^(º)C`

Description : Dinitrogen gas is evolved when sodium nitrite is heated below `500^(º)C`

Last Answer : Dinitrogen gas is evolved when sodium nitrite is heated below `500^(º)C` A. alone B. ... chloride C. with sodium chloride D. with potassium nitrate

Dinitrogen gas is evolved when sodium nitrite is heated below `500^(º)C`

Description : Dinitrogen gas is evolved when sodium nitrite is heated below `500^(º)C`

Last Answer : Dinitrogen gas is evolved when sodium nitrite is heated below `500^(º)C` A. alone B. ... chloride C. with sodium chloride D. with potassium nitrate

Two inorganic compounds A and B were heated in a dry test tube. A evolved a colourless gas which turned lead acetate paper black and B evolved a gas w

Description : Two inorganic compounds A and B were heated in a dry test tube. A evolved a colourless gas which turned lead acetate paper black and B evolved a gas w

Last Answer : Two inorganic compounds A and B were heated in a dry test tube. A evolved a colourless gas which turned lead acetate ... ` D. `S^(2-), NO_(3)^(-)`

Magnesium ribbon on burning in air produces a) magnesium oxide ,water and light c) magnesium oxide and heat b) magnesium oxide , heat and light d) magnesium oxide, water and heat

Description : Magnesium ribbon on burning in air produces a) magnesium oxide ,water and light c) magnesium oxide and heat b) magnesium oxide , heat and light d) magnesium oxide, water and heat

Last Answer : b) magnesium oxide , heat and light

Why should a magnesium ribbon be cleaned before burning in air ? -Chemistry-10

Description : Why should a magnesium ribbon be cleaned before burning in air ? -Chemistry-10

Last Answer : Magnesium gets covered with a layer of magnesium oxide when kept in air for a long time. This layer hinders the burning of magnesium. Hence, it is to be cleaned before burning.

You are provided with magnesium ribbon and sulpher powder. Explain with the help of an activity that metal oxides are basic and non-metal oxide are acidic in nature. -Chemistry

Description : You are provided with magnesium ribbon and sulpher powder. Explain with the help of an activity that metal oxides are basic and non-metal oxide are acidic in nature. -Chemistry

Last Answer : Aim: To test the nature of oxides formed by metals and non-metals. Materials Required: Sulphur powder, Mg ribbon, water, blue litmus paper, red litmus paper. Procedure: 1.Take magnesium ribbon ... the metallic oxides are basic in nature whereas most of the non-metallic oxides are acidic in nature.

Is Magnesium ribbon burns leaving white ash?

Description : Is Magnesium ribbon burns leaving white ash?

Last Answer : Need answer

Which compound is formed when a Magnesium ribbon is burnt in air? (1) Magnesium Nitrate (2) Magnesium Carbonate (3) Magnesium Oxide (4) Magnesium Nitride

Description : Which compound is formed when a Magnesium ribbon is burnt in air? (1) Magnesium Nitrate (2) Magnesium Carbonate (3) Magnesium Oxide (4) Magnesium Nitride

Last Answer : (3) Magnesium Oxide Explanation: When Magnesium burns air it reacts with oxygen present in air to form magnesium oxide.

Give reason: Magnesium ribbon should not be kept near bottles containing volatile chemicals.

Description : Give reason: Magnesium ribbon should not be kept near bottles containing volatile chemicals.

Last Answer : Magnesium is a reactive metal therefore it should not be kept near bottles containing volatile chemicals.

The displacement reaction between iron (III) oxide and a metal X is used for welding the rail tracks. Here X is: (a) Copper granules (b) Magnesium ribbon (c) Sodium pellets (d) Aluminum dust

Description : The displacement reaction between iron (III) oxide and a metal X is used for welding the rail tracks. Here X is: (a) Copper granules (b) Magnesium ribbon (c) Sodium pellets (d) Aluminum dust

Last Answer : (d) Aluminum dust

The redness in atmosphere at Sunrise and Sunset is due to – (1) Refraction of light (2) Reflection of light (3) Dispersion of light (4) Scattering of light

Description : The redness in atmosphere at Sunrise and Sunset is due to – (1) Refraction of light (2) Reflection of light (3) Dispersion of light (4) Scattering of light

Last Answer : (4) Scattering of light Explanation: The red colour in the sky at sunset (and sunrise) is due to an effect called Rayleigh scattering. At sunrise or sunset, since the Sun is low on the horizon, ... through more of the atmosphere - and therefore bounce off more molecules -than at other times of day.

The redness in atmosphere at Sunrise and Sunset is due to : (1) Refraction of light (2) Reflection of light (3) Dispersion of light (4) Scattering of light

Description : The redness in atmosphere at Sunrise and Sunset is due to : (1) Refraction of light (2) Reflection of light (3) Dispersion of light (4) Scattering of light

Last Answer : Scattering of light

Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. -History

Description : Saloni took a piece of burning charcoal and collected the gas evolved in a test tube. -History

Last Answer : She can find the nature of the gas by using a wet litmus paper. After bringing the litmus paper in contact with the gas, if it turns the blue litmus paper into red, it is acidic. Similarly, if it ... basic. (b) (i) Carbon + Oxygen → Carbon dioxide (ii) Carbon dioxide + Lime water → Milky

Which of the following statements concerning the specific gravity of a battery electrolyte is true? A. The electrolyte becomes less dense when it is cooled. B. The specific gravity reading is lowered when the electrolyte is heated. C. The most accurate hydrometer reading is obtained immediately after water is added. D. The temperature does not affect the specific gravity of the electrolyte.

Description : Which of the following statements concerning the specific gravity of a battery electrolyte is true? A. The electrolyte becomes less dense when it is cooled. B. The specific gravity reading is lowered ... water is added. D. The temperature does not affect the specific gravity of the electrolyte.

Last Answer : Answer: B

What happen with the air in a soccer ball with a cooled and heated?

Description : What happen with the air in a soccer ball with a cooled and heated?

Last Answer : The air pressure goes down when cooled, goes up when heated. Asoccer ball left outdoors in freezing weather does not have muchbounce. Left outside on a hot day, has a lot of bounce.

What happen with the air in a soccer ball with a cooled and heated?

Description : What happen with the air in a soccer ball with a cooled and heated?

Last Answer : The air pressure goes down when cooled, goes up when heated. Asoccer ball left outdoors in freezing weather does not have muchbounce. Left outside on a hot day, has a lot of bounce.

What is the perfect condition for dehumidification of air? A. air is heated above its dew point temperature B. air is cooled up to its dew point temperature C. air is heated below its dew point temperature D. air is cooled below its dew point temperature

Description : What is the perfect condition for dehumidification of air? A. air is heated above its dew point temperature B. air is cooled up to its dew point temperature C. air is heated below its dew point temperature D. air is cooled below its dew point temperature

Last Answer : ANSWER : D

When the humidity ratio of air increases the air is said to be A. dehumidified B. humidified C. heated D. cooled

Description : When the humidity ratio of air increases the air is said to be A. dehumidified B. humidified C. heated D. cooled

Last Answer : ANSWER : B

The power required to drive a turbo compressor for a given pressure ratio decreases when A. Air is heated at entry B. Air is cooled at entry C. Air is cooled at exit D. Air is heated at exit

Description : The power required to drive a turbo compressor for a given pressure ratio decreases when A. Air is heated at entry B. Air is cooled at entry C. Air is cooled at exit D. Air is heated at exit

Last Answer : ANSWER : B

Which plastic acquires hardness perma- nently when heated and cooled?

Description : Which plastic acquires hardness perma- nently when heated and cooled?

Last Answer : Thermosetting plastics

Why does glass crack when suddenly heated or cooled?

Description : Why does glass crack when suddenly heated or cooled?

Last Answer : Glass is a bad conductor of heat but expands easily on heating. When it is suddenly heated or cooled, due to rapid expansion and contraction along the hot region and cold region it begins to crack.

Double pipe heat exchangers are preferably useful, when (A) High viscosity liquid is to be cooled (B) Requirement of heat transfer area is low (C) Overall heat transfer co-efficient is very high (D) A corrosive liquid is to be heated

Description : Double pipe heat exchangers are preferably useful, when (A) High viscosity liquid is to be cooled (B) Requirement of heat transfer area is low (C) Overall heat transfer co-efficient is very high (D) A corrosive liquid is to be heated

Last Answer : (B) Requirement of heat transfer area is low

The oxygen evolved during photosynthesis, comes from water molecules. Which one of the following pairs of elements is involved in this reaction?(a) Magnesium and Molybdenum (b) Magnesium and Chlorine (c) Manganese and Chlorine (d) Manganese and Potassium

Description : The oxygen evolved during photosynthesis, comes from water molecules. Which one of the following pairs of elements is involved in this reaction? (a) Magnesium and Molybdenum (b) Magnesium and Chlorine (c) Manganese and Chlorine (d) Manganese and Potassium

Last Answer : (c) Manganese and Chlorine

During photosynthesis in plants, the gas evolved is - (1) Carbon dioxide (2) Nitrogen (3) Oxygen (4) Hydrogen

Description : During photosynthesis in plants, the gas evolved is - (1) Carbon dioxide (2) Nitrogen (3) Oxygen (4) Hydrogen

Last Answer : (3) Oxygen Explanation: Photosynthesis is a process used by plants and other organisms to convert the light energy captured from the sun into chemical energy that can be used to fuel the organism ... , through primary production, or indirectly, as the ultimate source of the energy in their food.

During photosynthesis in plants, the gas evolved is (1) Carbon dioxide (2) Nitrogen (3) Oxygen (4) Hydrogen

Description : During photosynthesis in plants, the gas evolved is (1) Carbon dioxide (2) Nitrogen (3) Oxygen (4) Hydrogen

Last Answer : Oxygen

If the atmosphere is cooled, what is its capacity for water vapour? -General Knowledge

Description : If the atmosphere is cooled, what is its capacity for water vapour? -General Knowledge

Last Answer : The answer is 'Lowered'

If the atmosphere is cooled, what is its capacity for water vapour? -General Knowledge

Description : If the atmosphere is cooled, what is its capacity for water vapour? -General Knowledge

Last Answer : answer:

If the atmosphere is cooled, what is its capacity for water vapour?

Description : If the atmosphere is cooled, what is its capacity for water vapour?

Last Answer : Lowered

This early atmosphere was rich in CO2 and H2O. How did oxygen enter our atmosphere? (a) Meteorites. (b) From organisms that evolved to convert CO2 and H20 into sugars (energy), resulting in the waste product oxygen. (c) Volcanic emissions. (d) Methanogenic bacteria.

Description : This early atmosphere was rich in CO2 and H2O. How did oxygen enter our atmosphere? (a) Meteorites. (b) From organisms that evolved to convert CO2 and H20 into sugars (energy), resulting in the waste product oxygen. (c) Volcanic emissions. (d) Methanogenic bacteria.

Last Answer : (b) From organisms that evolved to convert CO2 and H20 into sugars (energy), resulting in the waste product oxygen.

A mixture of white powder and coke is heated in nitrogen gas very strongly. The product are

Description : A mixture of white powder and coke is heated in nitrogen gas very strongly. The product are

Last Answer : A mixture of white powder and coke is heated in nitrogen gas very strongly. The product are A. `Al_(2)O_(3),C_(2) ... D. `Al_(2)(CO_(3))_(3),N_(2)O`

Write chemical equation reactions taking place when carried out with the help of (a) Iron reacts with steam (b) Magnesium reacts with dil HCl (c) Copper is heated in air. -Chemistry

Description : Write chemical equation reactions taking place when carried out with the help of (a) Iron reacts with steam (b) Magnesium reacts with dil HCl (c) Copper is heated in air. -Chemistry

Last Answer : This is the Answer.

Which one of the following gases is liberated when ethyl alcohol is heated with methyl magnesium iodide?

Description : Which one of the following gases is liberated when ethyl alcohol is heated with methyl magnesium iodide?

Last Answer : Which one of the following gases is liberated when ethyl alcohol is heated with methyl magnesium ... Methane B. Ethane C. Carbondioxide D. Propane

Which one of the following gases is liberated when ethyl alcohol is heated with methyl magnesium iodide?

Description : Which one of the following gases is liberated when ethyl alcohol is heated with methyl magnesium iodide?

Last Answer : Which one of the following gases is liberated when ethyl alcohol is heated with methyl magnesium ... Methane B. Ethane C. Carbondioxide D. Propane

Magnesium is heated in air.

Description : Magnesium is heated in air.

Last Answer : Write balanced chemical equations : Magnesium is heated in air.

For the estimation of nitrogen, 1.4 g of an organic compound was digested by Kjeldahl method and the evolved ammonia acid absorbed in 60 mL of `M/10`

Description : For the estimation of nitrogen, 1.4 g of an organic compound was digested by Kjeldahl method and the evolved ammonia acid absorbed in 60 mL of `M/10`

Last Answer : For the estimation of nitrogen, 1.4 g of an organic compound was digested by Kjeldahl method and the evolved ammonia ... ` B. `10%` C. `3%` D. `5%`

A student dropped few pieces of marble in dilute hydrochloric acid contained in a test tube. The evolved gas was then passed through lime water. What change would be observed in lime water? Write balanced chemical equation for both the change observed?

Description : A student dropped few pieces of marble in dilute hydrochloric acid contained in a test tube. The evolved gas was then passed through lime water. What change would be observed in lime water? Write balanced chemical equation for both the change observed?

Last Answer : Answer. When dilute HCl is added to marble which is calcium carbonate, it forms calcium chloride, water and carbon dioxide. The chemical equation for the reaction is as follows: CaCO3 + 2HCl → CaCl2 + H2O ... reaction between lime water and carbon dioxide is as follows: Ca(OH)2 + CO2 → CaCO3 + H2O

In order to find the specific heat capacity of an unknown material a 50 g piece is heated to 80 degrees Celsius and fully immersed in a well insulated calorimeter filled with 100 g of water at 10 degr?

Description : In order to find the specific heat capacity of an unknown material a 50 g piece is heated to 80 degrees Celsius and fully immersed in a well insulated calorimeter filled with 100 g of water at 10 degr?

Last Answer : Assuming that the full question, which the questioner failed to post, is given in the Discussion, below.Taking the specific heat capacity of water as 4.2 Joules per gram per degree C, the metal has a specific heat capacity as approx 0.68 Joules/(g °C).

__________ printers print the characters by striking them on the ribbon which is then pressed on the paper. A. Impact B. Non Impact C. Both (A) and (B) D. None of the Above

Description : __________ printers print the characters by striking them on the ribbon which is then pressed on the paper. A. Impact B. Non Impact C. Both (A) and (B) D. None of the Above

Last Answer : A. Impact

What happens when a piece of bangle is heated in a candle flame?

Description : What happens when a piece of bangle is heated in a candle flame?

Last Answer : When a piece of bangle is heated in a candle flame, it first becomes soft and then melts as glass does not have a definite melting point.

Which of the following is the best example of law of conservation of mass? [NCERT 1975] (A) 12 g of carbon combines with 32 g of oxygen to form 44 g of CO2. (B) When 12 g of carbon is heated in a vacuum there is no change in mass. (C) A sample of air increases in volume when heated at constant pressure but its mass remains unaltered. (D) The weight of a piece of platinum is the same before and after heating in air.

Description : Which of the following is the best example of law of conservation of mass? [NCERT 1975] (A) 12 g of carbon combines with 32 g of oxygen to form 44 g of CO2. (B) When 12 g of carbon is ... mass remains unaltered. (D) The weight of a piece of platinum is the same before and after heating in air.

Last Answer : (A) 12 g of carbon combines with 32 g of oxygen to form 44 g of CO2.

What is the most abundant gas in our atmosphere oxygen hydrogen nitrogen water?

Description : What is the most abundant gas in our atmosphere oxygen hydrogen nitrogen water?

Last Answer : It is nitrogen, followed by oxygen.

Fire in fuel gas pipelines is extinguished most effectively by (A) Spraying water (B) Blanketting the area with nitrogen atmosphere (C) Fire fighting foam (D) None of these

Description : Fire in fuel gas pipelines is extinguished most effectively by (A) Spraying water (B) Blanketting the area with nitrogen atmosphere (C) Fire fighting foam (D) None of these

Last Answer : Option B

1/125th part of nitrogen gas isolated from atmosphere did not combine with any other substance due to

Description : 1/125th part of nitrogen gas isolated from atmosphere did not combine with any other substance due to

Last Answer : 1/125th part of nitrogen gas isolated from atmosphere did not combine with any other substance due to A. ... noble gases D. The presence of `O_(2)`.

Which gas does not form the part, of atmosphere? (1) Nitrogen (2) Helium (3) Chlorine (4) None of the above

Description : Which gas does not form the part, of atmosphere? (1) Nitrogen (2) Helium (3) Chlorine (4) None of the above

Last Answer : (3) Chlorine Explanation: The atmosphere of Earth is a layer of gases surrounding the planet Earth that is retained by Earth's gravity. The atmosphere protects life on Earth by absorbing ... temperature variations). Air is the name given to the atmosphere used in breathing and photosynthesis.

Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N2) to the atmosphere? (a) Aerobic nitrate oxidation and nitrite reduction (b) Decomposition of organic nitrogen and conversion of dinitrogen to ammonium compounds (c) Enteric fermentation in cattle and nitrogen fixation by Rhizobium in root nodules of legumes (d) Anaerobic ammonium oxidation and denitrification

Description : Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N2) to the atmosphere? (a) Aerobic nitrate oxidation and nitrite reduction (b) ... fixation by Rhizobium in root nodules of legumes (d) Anaerobic ammonium oxidation and denitrification

Last Answer : (d) Anaerobic ammonium oxidation and denitrification

Which gas does not form the part of atmosphere ? (1) Nitrogen (2) Helium (3) Chlorine (4) None of the above

Description : Which gas does not form the part of atmosphere ? (1) Nitrogen (2) Helium (3) Chlorine (4) None of the above

Last Answer : Chlorine