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

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
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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)^(-)`
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An aluminium strip is kept immersed in a freshly prepared ferrous sulphate solution taken in a test tube, the change observed is that a) Green solution slowly turns brown b) Lower end of the test tube becomes slightly warm c)A colourless gas with smell of burning sulphur is evolved c)Light green solution changes to blue

Description : An aluminium strip is kept immersed in a freshly prepared ferrous sulphate solution taken in a test tube, the change observed is that a) Green solution slowly turns brown b) Lower end of the test ... c)A colourless gas with smell of burning sulphur is evolved c)Light green solution changes to blue

Last Answer : a) Green solution slowly turns brown

What happens when: a) When a mixture of sodium acetate and soda lime is heated in a hard glass test tube.

Description : What happens when: a) When a mixture of sodium acetate and soda lime is heated in a hard glass test tube.

Last Answer : Methane gas is evolved. CH 3 COONA + NaOH CaO Na 2 CO 3 + CH 4 b) Methane is burnt in air or oxygen or methane undergoes complete combustion. It forms carbon dioxide and water. CO 2 + H ... ultraviolet light (sunlight). Organic product chloromethane is formed CH 4 + Cl 2 UV CH 3 Cl + HCl

A gas has smell like rotten egg and turns lead acetate paper black. The gas is :

Description : A gas has smell like rotten egg and turns lead acetate paper black. The gas is :

Last Answer : A gas has smell like rotten egg and turns lead acetate paper black. The gas is : A. `NO_(2)` B. `H_(2)S` C. `CO_(2)` D. `SO_(2)`

Gas X and Gas Y in solution state react to give a turns substance Z. X has unpleasant odour and turns lead acetate paper black. In the first reaction

Description : Gas X and Gas Y in solution state react to give a turns substance Z. X has unpleasant odour and turns lead acetate paper black. In the first reaction

Last Answer : Gas X and Gas Y in solution state react to give a turns substance Z. X has unpleasant odour and turns lead ... )Orarr` D. `SO_(2)+H_(2)O_(2)rarr`

Gas X and Gas Y in solution state react to give a turns substance Z. X has unpleasant odour and turns lead acetate paper black. In the first reaction

Description : Gas X and Gas Y in solution state react to give a turns substance Z. X has unpleasant odour and turns lead acetate paper black. In the first reaction

Last Answer : Gas X and Gas Y in solution state react to give a turns substance Z. X has unpleasant odour and turns lead acetate ... 2)` C. `H_(2)S` D. `SO_(3)`

Gas X and Gas Y in solution state react to give a turns substance Z. X has unpleasant odour and turns lead acetate paper black. In the first reaction

Description : Gas X and Gas Y in solution state react to give a turns substance Z. X has unpleasant odour and turns lead acetate paper black. In the first reaction

Last Answer : Gas X and Gas Y in solution state react to give a turns substance Z. X has unpleasant odour and turns lead acetate ... SO_(2)` D. `SO_(2) and O_(3)`

Which of the following turns lead acetate paper black?

Description : Which of the following turns lead acetate paper black?

Last Answer : Which of the following turns lead acetate paper black? A. `SO_(2)` B. `SO_(3)` C. `H_(2)S` D. `H_(2)SO_(4)`

If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains A. Hydrogen sulphide B. Carbon dioxide C. Methane D. Oxygen

Description : If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains A. Hydrogen sulphide B. Carbon dioxide C. Methane D. Oxygen

Last Answer : ANS: A

Which of the following salts release reddish brown gas when heated in a dry test tube ?

Description : Which of the following salts release reddish brown gas when heated in a dry test tube ?

Last Answer : Which of the following salts release reddish brown gas when heated in a dry test tube ? A. `LiNO_(3)` B. `KNO_(3)` C. `Pb(NO_(3))_(2)` D. `AgNO_(3)`

Which of the following can not evolve more than one gas (vapour) if heated in dry test tube.

Description : Which of the following can not evolve more than one gas (vapour) if heated in dry test tube.

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List any two observations when Ferrous Sulphate is heated in a dry test tube? -Science

Description : List any two observations when Ferrous Sulphate is heated in a dry test tube? -Science

Last Answer : Two Observations Are: 1) Change in colour of crystals from green to white. 2) Evolution of gas. The gases evolved are SO2 and SO3.

When a metal sulphate is heated in dry test tube, the colour changes from blue to white. Then metal sulphate may be :

Description : When a metal sulphate is heated in dry test tube, the colour changes from blue to white. Then metal sulphate may be :

Last Answer : When a metal sulphate is heated in dry test tube, the colour changes from blue to white. Then metal sulphate may ... . `Na_(2)SO_(4)` D. None of these

Which of the following compounds is used as an antiknock compound? (a) Ethyllithium (b) Tetraethyllead (c) Ethyl acetate (d) Lead acetate

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Last Answer : Tetraethyllead

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

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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

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

Lead acetate test in sewer manhole is done to test the presence of A. Methane gas B. Hydrogen sulphide C. Carbondioxide gas D. Diesel vapours

Description : Lead acetate test in sewer manhole is done to test the presence of A. Methane gas B. Hydrogen sulphide C. Carbondioxide gas D. Diesel vapours

Last Answer : ANS: B

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

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

Last Answer : 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

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

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%

Which of the following compounds will give a positive test with Fehling's solution? (a) Formaldehyde (b) Acetone (c) Ethyl acetate (d) Acetic acid

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Photographic plates are covered with black paper because (a) the cellulose acetate of the paper must remain fresh (b) sunlight is easily absorbed by black paper and it helps develop the film (c) the silver bromide present on the plate is very sensitive to light and black paper prevents contact with light (d) the conversion of silver bromide to metallic silver is essential

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`H_(2)S` reacts with lead acetate forming black compound which reacts with `O_(3)` to form another compound Y. The colour of the compound Y is:

Description : `H_(2)S` reacts with lead acetate forming black compound which reacts with `O_(3)` to form another compound Y. The colour of the compound Y is:

Last Answer : `H_(2)S` reacts with lead acetate forming black compound which reacts with `O_(3)` to form another compound ... : A. black B. violet C. white D. green

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Description : What is the Formula of the colored precipitate obtained in the sulfur test or lead acetate test?

Last Answer : What is the answer ?

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Description : Guanidine group of argentine gives positive test with (A) Lead acetate (B) Sakaguchi reagent (C) Tricholoroacetic acid (D) Molisch’s reagent

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Consider following properties of the noble gases. I. They readily form compounds which are colourless. II: They generally do not form ionic compounds.

Description : Consider following properties of the noble gases. I. They readily form compounds which are colourless. II: They generally do not form ionic compounds.

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2g of ferrous sulphate crystals are heated in a dry boiling tube. (i) List any two observations. (ii) Name the type of chemical reaction taking place. (iii) ‘Write the chemical equation for the reaction. -Chemistry

Description : 2g of ferrous sulphate crystals are heated in a dry boiling tube. (i) List any two observations. (ii) Name the type of chemical reaction taking place. (iii) ‘Write the chemical equation for the reaction. -Chemistry

Last Answer : Answer. (i) •Green colour of Fe SO4 disappears and reddish brown solid is formed. • Smell of burning sulphur. (ii) Decomposition reaction

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Description : Bromine is a----------? A. black solid B. red-brown liquid (Answer) C. colourless gas D. highly inflammable gas

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Description : When chloroform is heated with aqueous NaOH, it gives (a) Formic acid (b) Sodium formate (c) Acetic acid (d) Sodium acetate

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As Rhombic sulphur is heated in a test tube : `{:(,"Process","Temperature"),((a),"Viscosity increases",T_(1)),((b),"Visconsity decrease",T_(2)),((c),"

Description : As Rhombic sulphur is heated in a test tube : `{:(,"Process","Temperature"),((a),"Viscosity increases",T_(1)),((b),"Visconsity decrease",T_(2)),((c),"

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As Rhombic sulphur is heated in a test tube : `{:(,"Process","Temperature"),((a),"Viscosity increases",T_(1)),((b),"Visconsity decrease",T_(2)),((c),"

Description : As Rhombic sulphur is heated in a test tube : `{:(,"Process","Temperature"),((a),"Viscosity increases",T_(1)),((b),"Visconsity decrease",T_(2)),((c),"

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Which of the following compounds would be unaffected by boiling aqueous NaOH? (a) Chloroethane (b) Acetaldehyde (c) Chlorobenzene (d) Ethyl acetate

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Give reasons for the following observations: (a) The element carbon forms a very large number of compounds. (b) Air holes of a gas burner have to be adjusted when the heated vessels get blackened by the flame. (c) Use of synthetic detergents causes pollution of water. -Chemistry

Description : Give reasons for the following observations: (a) The element carbon forms a very large number of compounds. (b) Air holes of a gas burner have to be adjusted when the heated vessels get blackened by the flame. (c) Use of synthetic detergents causes pollution of water. -Chemistry

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When ethanol is heated with concentrated H2SO4, a gas is produced. Which of the following compounds is formed when this gas is treated with bromine in CCl4?E2 (a) Bromomethane (b) 1,2-Dibromoethane (c) Bromoethane (d) 1,1,2,2-Tetrabromoethane

Description : When ethanol is heated with concentrated H2SO4, a gas is produced. Which of the following compounds is formed when this gas is treated with bromine in CCl4?E2 (a) Bromomethane (b) 1,2-Dibromoethane (c) Bromoethane (d) 1,1,2,2-Tetrabromoethane

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The filament of an electric lamp becomes white hot but the lead-in wires holding the filament are only slightly heated because they (a) have smaller current passing through them (b) have very low resistance (c) have higher melting point (d) are made of black iron

Description : The filament of an electric lamp becomes white hot but the lead-in wires holding the filament are only slightly heated because they (a) have smaller current passing through them (b) have very low resistance (c) have higher melting point (d) are made of black iron

Last Answer : Ans:(b)

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'

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The complex organic compounds that may have first evolved in the direction of origin of life on earth, may have been

Description : The complex organic compounds that may have first evolved in the direction of origin of life on earth, may have been

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What are the two differences between organic compounds and inorganic compounds ?

Description : What are the two differences between organic compounds and inorganic compounds ?

Last Answer : The two differences between organic and inorganic compounds are mentioned below: 1. All organic compounds must have carbon in their molecules. Such as: CH 4, C 2 H 3 OH etc. But molecules of ... On the other hand, due to ionic bonds, the reaction of inorganic compounds is faster. Thank you!

“Despite their white, fluffy appearance, Polar Bear skin is actually black, and their fur is transparent and colourless. ”

Description : “Despite their white, fluffy appearance, Polar Bear skin is actually black, and their fur is transparent and colourless. ” 

Last Answer : Ask anyone what colour a polar bear is and they will exclaim, white with great enthusiasm, but truth be told, their fur is actually transparent and holds no colour. It only appears white ... ultraviolet light, which means polar bears stand out like a sore thumb against their icy white backdrop.

Soap Organic Compounds or Inorganic Compounds ?

Description : Soap Organic Compounds or Inorganic Compounds ?

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What is the name of the first organic compound prepared from inorganic compounds ?

Description : What is the name of the first organic compound prepared from inorganic compounds ?

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Description : Across a membrane phospholipids act as carrier of (A) Organic compounds (B) Inorganic ions (C) Nucleic acids (D) Food materials

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Sulphur can be utilized by bacteria in the form of a. Organic compounds b. Inorganic compounds c. Elemental compounds d. All of the above

Description : Sulphur can be utilized by bacteria in the form of a. Organic compounds b. Inorganic compounds c. Elemental compounds d. All of the above

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Covalent bonds are mainly found in (a) Organic compounds (b) Inorganic compounds (c) Electrolytes (d) None of the above

Description : Covalent bonds are mainly found in (a) Organic compounds (b) Inorganic compounds (c) Electrolytes (d) None of the above

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Contraceptive pills in the market contain – (1) steroid-hormones (2) inorganic compounds (3) herbicides (4) antibiotics

Description : Contraceptive pills in the market contain – (1) steroid-hormones (2) inorganic compounds (3) herbicides (4) antibiotics

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Enzymes are – (1) Micro organisms (2) Proteins (3) Inorganic compounds (4) Moulds

Description : Enzymes are – (1) Micro organisms (2) Proteins (3) Inorganic compounds (4) Moulds

Last Answer : (2) Proteins Explanation: Enzymes are proteins that act as a catalyst, lowering the activation energy of a reaction, therefore dramatically increasing the rate of the reaction. Like all ... of amino acids that fold to produce a three-dimensional product which determines their specific activities.

Saprophytes are the organisms which depend for food on – (1) living plants (2) living animals (3) dead and decaying material (4) inorganic chemical compounds

Description : Saprophytes are the organisms which depend for food on – (1) living plants (2) living animals (3) dead and decaying material (4) inorganic chemical compounds

Last Answer : (3) dead and decaying material Explanation: Saprophytes are the organisms which depend for food on dead and decaying material.

The inorganic elements or compounds which occur naturally in the earth’s crust are known as?

Description : The inorganic elements or compounds which occur naturally in the earth’s crust are known as?

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Mention the differences between organic and inorganic compounds.

Description : Mention the differences between organic and inorganic compounds.

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Who suggested the classification of chemical compounds as inorganic and organic?

Description : Who suggested the classification of chemical compounds as inorganic and organic?

Last Answer : J.J.Berzelius