Lead pencil contains – (1) lead (2) ferrous sulphide (3) lead sulphide (4) graphite

Lead pencil contains – (1) lead (2) ferrous sulphide (3) lead sulphide (4) graphite
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(4) graphite Explanation: Most pencil cores are made of graphite mixed with a clay binder, leaving grey or black marks that can be easily erased. Graphite pencils are used for both writing and drawing, and the result is durable: although writing can usually be removed with an eraser, it is resistant to moisture, most chemicals, ultraviolet radiation and natural aging.
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Lead pencil contains (1) lead (2) ferrous sulphide (3) lead sulphide (4) graphite

Description : Lead pencil contains (1) lead (2) ferrous sulphide (3) lead sulphide (4) graphite

Last Answer : graphite

Lead pencil contains (A) Graphite (B) Lead sulphide (C) Lead (D) Both (B) & (C)

Description : Lead pencil contains (A) Graphite (B) Lead sulphide (C) Lead (D) Both (B) & (C)

Last Answer : A) Graphite

Lead pencil contains - (1) Lead nitrate (2) Graphite (3) Lead peroxide (4) Lead Sulphate

Description : Lead pencil contains - (1) Lead nitrate (2) Graphite (3) Lead peroxide (4) Lead Sulphate

Last Answer : (2) Graphite Explanation: Most pencil cores are made of graphite mixed with a clay binder which leaves grey or black marks that can be easily erased.

The material used in the manufacture of lead pencil is – (1) Graphite (2) Lead (3) Carbon (4) Mica

Description : The material used in the manufacture of lead pencil is – (1) Graphite (2) Lead (3) Carbon (4) Mica

Last Answer : (1) Graphite Explanation: Pencils create marks via physical abrasion, leaving behind a trail of solid core material that adheres to a sheet of paper or other surface. They are noticeably distinct from ... of graphite mixed with a clay binder, leaving grey or black marks that can be easily erased.

The material used in the manufacture of lead pencil is (1) Graphite (2) Lead (3) Carbon (4) Mica

Description : The material used in the manufacture of lead pencil is (1) Graphite (2) Lead (3) Carbon (4) Mica

Last Answer : Graphite

Iron rust is (A) Ferrous oxide (B) Hydrated ferric oxide (C) Powdered iron (D) Ferric sulphide

Description : Iron rust is (A) Ferrous oxide (B) Hydrated ferric oxide (C) Powdered iron (D) Ferric sulphide

Last Answer : (B) Hydrated ferric oxide

A greenish grey layer seen at interface of yolk and egg white is due to the formation of: a. Ferrous nitrate b. Ferrous prusside c. Ferrous citrate d. Ferrous sulphide

Description : A greenish grey layer seen at interface of yolk and egg white is due to the formation of: a. Ferrous nitrate b. Ferrous prusside c. Ferrous citrate d. Ferrous sulphide

Last Answer : d. Ferrous sulphide

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

Can I use a 4b graphite pencil for regular drawing?

Description : Can I use a 4b graphite pencil for regular drawing?

Last Answer : Why not try it and see whether it suits your particular needs?

Lead pencil contains

Description : Lead pencil contains

Last Answer : Graphite

Which of the following is also known as 'Galena'? (1) Lead sulphate (2) Lead oxide (3) Lead sulphide (4) Calcium sulphate

Description : Which of the following is also known as 'Galena'? (1) Lead sulphate (2) Lead oxide (3) Lead sulphide (4) Calcium sulphate

Last Answer : (3) Lead sulphide Explanation: Galena, also called lead glance, is the natural mineral form of lead sulfide. It is the most important ore of lead and an important source of silver.

Which compound is used as oxidizing agent for lead sulphide to restore the color of lead paintings?

Description : Which compound is used as oxidizing agent for lead sulphide to restore the color of lead paintings?

Last Answer : Ans-H2O2

Write the molecular formulae of: 1. Copper oxide 2. Iron (III) chloride 3. Sodium hydroxide 4. Iron (II) sulphide 5. Lead (II) oxide 6. Hydrogen nitrate (nitric acid) 7. Hydrogen sulphate (sulphuric acid) 8. Calcium hydroxide 9. Magnesium carbonate 10.Ammonium carbonate

Description : Write the molecular formulae of: 1. Copper oxide 2. Iron (III) chloride 3. Sodium hydroxide 4. Iron (II) sulphide 5. Lead (II) oxide 6. Hydrogen nitrate (nitric ... Hydrogen sulphate (sulphuric acid) 8. Calcium hydroxide 9. Magnesium carbonate 10.Ammonium carbonate

Last Answer : 1. Copper oxide - CuO 2. Iron (III) chloride - FeCl3 3. Sodium hydroxide - NaOH 4. Iron (II) sulphide - FeS 5. Lead (II) oxide - PbO 6. Hydrogen nitrate (nitric acid) - HNO3 7. ... ) - H2SO4 8. Calcium hydroxide - Ca(OH)2 9. Magnesium carbonate - MgCO3 10.Ammonium carbonate - (NH4)2CO3

Tear gas used by the police to disperse the mob contains - (1) Carbon dioxide (2) Chlorine (3) Ammonia (4) Hydrogen sulphide

Description : Tear gas used by the police to disperse the mob contains - (1) Carbon dioxide (2) Chlorine (3) Ammonia (4) Hydrogen sulphide

Last Answer : (2) Chlorine Explanation: Tear gas, formally known as a lachrymatory agent, is a possibly lethal chemical weapon that stimulates the corneal nerves in the eyes to cause tears, pain, and even blindness.

Gobar gas mainly contains – (1) Carbon dioxide (2) Carbon monoxide (3) Hydrogen sulphide (4) Methane

Description : Gobar gas mainly contains – (1) Carbon dioxide (2) Carbon monoxide (3) Hydrogen sulphide (4) Methane

Last Answer : (4) Methane Explanation: Biogas or Lobar gas is produced by the anaerobic digestion or fermentation of biodegradable materials such as biomass, manure, sewage, municipal waste, green waste, plant material ... (CO2) and may have small amounts of hydrogen sulphide (H2S), moisture and siloxanes.

Gobar gas mainly contains (1) Carbon dioxide (2) Carbon monoxide (3) Hydrogen sulphide (4) Methane

Description : Gobar gas mainly contains (1) Carbon dioxide (2) Carbon monoxide (3) Hydrogen sulphide (4) Methane

Last Answer : Methane

In the Froth Floatation process, zinc sulphide and lead sulphide can be separated by__________

Description : In the Froth Floatation process, zinc sulphide and lead sulphide can be separated by__________

Last Answer : In the Froth Floatation process, zinc sulphide and lead sulphide can be separated by__________ A. ... C. using depressent D. using froth stablisers

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

The sewer which resists sulphide corrosion, is A. Brick sewer B. Cast iron sewer C. R.C.C. sewer D. Lead sewer

Description : The sewer which resists sulphide corrosion, is A. Brick sewer B. Cast iron sewer C. R.C.C. sewer D. Lead sewer

Last Answer : ANS: D

Litharge is (A) Lead oxide (B) Zinc oxide (C) Zinc sulphide (D) Cellulosic photographic material

Description : Litharge is (A) Lead oxide (B) Zinc oxide (C) Zinc sulphide (D) Cellulosic photographic material

Last Answer : (A) Lead oxide

Minamata disease is due to pollutant a) Lead b) Mercury c) Hydrogen Sulphide d) Sulphur dioxide

Description : Minamata disease is due to pollutant a) Lead b) Mercury c) Hydrogen Sulphide d) Sulphur dioxide

Last Answer : b) Mercury

Muntz metal is a/an alloys of (A) Magnesium & tin (B) Ferrous material (C) Lead & tin (D) Copper & zinc

Description : Muntz metal is a/an alloys of (A) Magnesium & tin (B) Ferrous material (C) Lead & tin (D) Copper & zinc

Last Answer : (D) Copper & zinc

Which of the following is an yellow pigment? (A) Titanium dioxide (B) Ferrous sulphate (C) Lead chromates (D) Zinc sulphides

Description : Which of the following is an yellow pigment? (A) Titanium dioxide (B) Ferrous sulphate (C) Lead chromates (D) Zinc sulphides

Last Answer : (C) Lead chromates

The pigment used in paints for corrosive resistance, is (A) White lead (B) Ferrous oxide (C) Zinc white (D) Red lead

Description : The pigment used in paints for corrosive resistance, is (A) White lead (B) Ferrous oxide (C) Zinc white (D) Red lead

Last Answer : Answer: Option D

The positive plants of nickel iron cell is made up of a. Nickel hydroxide b. Lead peroxide c. Ferrous hydroxide d. Potassium hydroxide

Description : The positive plants of nickel iron cell is made up of a. Nickel hydroxide b. Lead peroxide c. Ferrous hydroxide d. Potassium hydroxide

Last Answer : a. Nickel hydroxide

The positive plates of nickel iron cell is made up of a. Nickel hydroxide b. Lead peroxide c. Ferrous hydroxide d. Potassium hydroxide

Description : The positive plates of nickel iron cell is made up of a. Nickel hydroxide b. Lead peroxide c. Ferrous hydroxide d. Potassium hydroxide

Last Answer : a. Nickel hydroxide

Philosopher’s wool contains zinc as its (a) oxide (b) bromide (c) nitrate (d) sulphide

Description : Philosopher’s wool contains zinc as its (a) oxide (b) bromide (c) nitrate (d) sulphide

Last Answer : Ans:(a)

Tear gas used by the police to disperse the mob contains – (1) carbon dioxide (2) chlorine (3) ammonia (4) hydrogen sulphide

Description : Tear gas used by the police to disperse the mob contains – (1) carbon dioxide (2) chlorine (3) ammonia (4) hydrogen sulphide

Last Answer : (2) chlorine Explanation: Tear gas is a compound. Each molecule of tear gas contains one atom of chlorine. The compound 2- chlorobenzalmalononitrile, a cyanocarbon, is the defining component of a "tear gas" commonly referred to as CS gas, which is used as a riot control agent.

If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains A. Hydrogen sulphide B. Carbon dioxide C. Methane D. Oxygen

Description : If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains A. Hydrogen sulphide B. Carbon dioxide C. Methane D. Oxygen

Last Answer : ANS: B

If the flame of a miner’s safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains A. Hydrogen sulphide B. Carbon dioxide C. Methane D. Oxygen

Description : If the flame of a miner’s safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains A. Hydrogen sulphide B. Carbon dioxide C. Methane D. Oxygen

Last Answer : ANS: C

Tear gas used by the police to disperse the mob contains (1) carbon dioxide (2) chlorine (3) ammonia (4) hydrogen sulphide

Description : Tear gas used by the police to disperse the mob contains (1) carbon dioxide (2) chlorine (3) ammonia (4) hydrogen sulphide

Last Answer : chlorine

Ferrous sulphate contains — % Fe a. 10 b. 20 c. 30 d. 40

Description : Ferrous sulphate contains — % Fe a. 10 b. 20 c. 30 d. 40

Last Answer : b. 20

How do you change the lead in a mechanical pencil?

Description : How do you change the lead in a mechanical pencil?

Last Answer : Usually you can pull the eraser off and add more lead that way. Sometimes you have to feed it in from the tip of the pencil, if the eraser won't come off. To do this, just click the pencil, hold it clicked, and slide a piece of lead into the tip.

Why is a bad pin like a broken lead pencil? -Riddles

Description : Why is a bad pin like a broken lead pencil? -Riddles

Last Answer : Because it has no point.

A lead pencil consists of a cylinder of wood -Maths 9th

Description : A lead pencil consists of a cylinder of wood -Maths 9th

Last Answer : Radius of solid graphite cylinder (r) = 1/2 mm = 1/2 x 1/10 = 1/20 cm Length of graphite cylinder (h) = 14 cm Volume of graphite cylinder (h) = πr2h = 22/7 x 1/20 x 1/20 x 14 = 0.11 cm3 Radius ... Volume of the wood = Volume of the pencil - Volume of the graphite = 5.39 cm3 - 0 .11 cm3 = 5.28 cm3

Is pencil lead a compound element or solution?

Description : Is pencil lead a compound element or solution?

Last Answer : Pencil lead is a mixture of graphite (the element carbon) andclay- which is itself a mixture of several different compounds andelements.

Is pencil lead a compound or an element or an homogeneous mixture or a heterogeneous mixture?

Description : Is pencil lead a compound or an element or an homogeneous mixture or a heterogeneous mixture?

Last Answer : It is a homogeneous mixture.

Consider a pack contains 2black, 9 white and 3 pink pencils. If a pencil is drawn at random from the pack, replaced and the process repeated 2 more times, What is the probability of drawing 2 black pencils and 1 pink pencil? a)3/ 49 b)3/686 c)3/14 d)3/545

Description : Consider a pack contains 2black, 9 white and 3 pink pencils. If a pencil is drawn at random from the pack, replaced and the process repeated 2 more times, What is the probability of drawing 2 black pencils and 1 pink pencil? a)3/ 49 b)3/686 c)3/14 d)3/545

Last Answer : Answer: B) Here, total number of pencils = 14 Probability of drawing 1 black pencil = 2/14 Probability of drawing another black pencil = 2/14 Probability of drawing 1 pink pencil = 3/14 Probability of drawing 2 black pencils and 1 pink pencil = 2/14 * 2/14 * 3/14 = 3/686

Match the following: List-I List-II (Minerals) (Mining areas) A. Graphite 1. Bellary B. Lead 2. Didwana C. Salt 3. Rampa D. Silver 4. Zawar Codes: (a) 3 4 1 2 (b) 1 4 2 3 (c) 3 1 4 2 (d) 2 3 1 4

Description : Match the following: List-I List-II (Minerals) (Mining areas) A. Graphite 1. Bellary B. Lead 2. Didwana C. Salt 3. Rampa D. Silver 4. Zawar Codes: (a) 3 4 1 2 (b) 1 4 2 3 (c) 3 1 4 2 (d) 2 3 1 4

Last Answer : Ans: (b)

Match the following: [IAS 1998] Minerals Mining area A: Graphite 1. Bellary B. Lead 2. Didwana C. Salt 3. Rampa D. Silver 4. Zawar A B C D (a) 3 4 1 2 (b) 1 4 2 3 (c) 3 1 4 2 (d) 2 3 1 4

Description : Match the following: [IAS 1998] Minerals Mining area A: Graphite 1. Bellary B. Lead 2. Didwana C. Salt 3. Rampa D. Silver 4. Zawar A B C D (a) 3 4 1 2 (b) 1 4 2 3 (c) 3 1 4 2 (d) 2 3 1 4

Last Answer : Ans: (b)

Material of construction of foundry crucible is (A) Lead (B) Stainless steel (C) Graphite

Description : Material of construction of foundry crucible is (A) Lead (B) Stainless steel (C) Graphite

Last Answer : Option C

Pick out the wrong statement. (A) Wrought iron contains about 0.02% carbon (B) Wrought iron cannot be easily forged and welded (C) The chilled cast iron does not contain graphite (D) Spheroidal grey cast iron contains graphite flakes

Description : Pick out the wrong statement. (A) Wrought iron contains about 0.02% carbon (B) Wrought iron cannot be easily forged and welded (C) The chilled cast iron does not contain graphite (D) Spheroidal grey cast iron contains graphite flakes

Last Answer : (B) Wrought iron cannot be easily forged and welded

The gas involved in Bhopal incident was - (1) Hydrogen sulphide (2) Nitrogen dioxide (3) Methyl chloride (4) Methyl isocyanide

Description : The gas involved in Bhopal incident was - (1) Hydrogen sulphide (2) Nitrogen dioxide (3) Methyl chloride (4) Methyl isocyanide

Last Answer : (4) Methyl isocyanide

Brass gets discoloured in air due to constant exposure in presence of: (1) Aluminium phosphide (2) Hydrogen sulphide (3) Hydrogenated wafers (4) Aluminium sulphide

Description : Brass gets discoloured in air due to constant exposure in presence of: (1) Aluminium phosphide (2) Hydrogen sulphide (3) Hydrogenated wafers (4) Aluminium sulphide

Last Answer : (2) Hydrogen sulphide Explanation: Brass gets discoloured in air because of Hydrogen sulphide. Transition elements are coloured. The brass is combination of Zn and Cu. But it is discoloured due to hydrogen sulphide in air.

Silver gets corroded due to ______ in air. (1) Oxygen (2) Hydrogen Sulphide (3) Carbon dioxide (4) Nitrogen

Description : Silver gets corroded due to ______ in air. (1) Oxygen (2) Hydrogen Sulphide (3) Carbon dioxide (4) Nitrogen

Last Answer : (2) Hydrogen Sulphide Explanation: Silver is a fairly stable metal and under normal circumstances does not corrode quickly. However, it is particularly susceptible to the effects of the sulfide ... atmosphere, especially in marine environment, and readily forms a surface tarnish of silver sulphide.

The chemical that is used to ripen mangoes is - (1) Calcium sulphide (2) Calcium carbide (3) Calcium carbonate (4) Calcium chloride

Description : The chemical that is used to ripen mangoes is - (1) Calcium sulphide (2) Calcium carbide (3) Calcium carbonate (4) Calcium chloride

Last Answer : (2) Calcium carbide Explanation: Calcium carbide is used for artificially ripening fruit. When calcium carbide comes in contact with moisture, it produces acetylene gas, which is quite ... the natural ripening agent ethylene. Acetylene acts like ethylene and accelerates the ripening process.

Ozone depletion in the atmosphere is mainly caused by - (1) sulphur dioxide (2) nitrogen dioxide (3) hydrogen sulphide (4) chlorofluorocarbon

Description : Ozone depletion in the atmosphere is mainly caused by - (1) sulphur dioxide (2) nitrogen dioxide (3) hydrogen sulphide (4) chlorofluorocarbon

Last Answer : (4) chlorofluorocarbon Explanation: A chlorofluorocarbon (CFC) is an organic compound that contains only carbon, chlorine, hydrogen and fluorine, produced as a volatile derivative of methane and ethane. They contribute to ozone depletion in the upper atmosphere.

Copper and Silver lie below in the electrochemical series and yet they are found in the combined state as sulphide in nature.Comment.

Description : Copper and Silver lie below in the electrochemical series and yet they are found in the combined state as sulphide in nature.Comment.

Last Answer : Ans. : Due to high polarizing power of Cu and Ag ions, their sulphides are even more stable than the metals. 

If we add equimolar amounts of ferric hydroxide sol and arsenic sulphide sol, what will happen ?

Description : If we add equimolar amounts of ferric hydroxide sol and arsenic sulphide sol, what will happen ?

Last Answer : Ans. Both the sols will get coagulated. 

Write the molecular formula for the oxide and sulphide of following elements. (a) Sodium (b) Calcium (c) Hydrogen

Description : Write the molecular formula for the oxide and sulphide of following elements. (a) Sodium (b) Calcium (c) Hydrogen

Last Answer : (a) Sodium oxide Na2O Sodium sulphide Na2S (b) Calcium oxide CaO Calcium sulphide CaS (c) Hydrogen oxide H2O Hydrogen sulphide H2S