Chemistry Quiz Set 10

Question No.1

The setting down of the Plaster of Paris consists of

1. Dehydration
2. Oxygenation
3. Reduction
4. Hydration to make other hydrates

Select Answer

Correct Answer: ( D )  

• The compound Plaster of Paris is prepared by heating Gypsum at 120 °C. 
• The chemical formula for the plaster of paris is (CaSO₄) $1\over{2}$H₂O.

$ \underset{(Gypsum) }{{CaSO_4}~ 2H_2O } $ $ {\overset {\Delta} {\rightarrow}}$ $ \underset{ (Plaster ~ of ~ Paris) }{{CaSO_4} ~ {1\over 2}H_2O }~ $ + $ {1\over2}H_2O $

Question No.2

Which of the following has the zero electron affinity in the periodic table?

1. Radium
2. Oxygen
3. Nitrogen
4. Radon

Select Answer

Correct Answer: ( D )  

Question No.3

Alkaline water decomposition of oils and fats give, soaps and ______

1. Ethanol
2. Glycol
3. Glycerol
4. Ethanoic acid

Select Answer

Correct Answer: ( C )  

Question No.4

Baryllium Sulphate is less soluble in water due to

1. High inflammable energy
2. Low Energy of dissociation
3. Low inflammable energy
4. Lonic band

Select Answer

Correct Answer: ( A )  

Question No.5

A real gas at a much higher pressure than and ideal gas have

1. Same volume
2. Low volume
3. High volume
4. None of these

Select Answer

Correct Answer: ( B )  

Question No.6

What is the name of that system, which uses radioactivity to decide the period of materials of-pre-historic period ?

1. Radium dating
2. Carbon dating
3. Uranium dating
4. Deuterium dating

Select Answer

Correct Answer: ( C )  

Question No.7

The three elements most needed in common fertilisers are :

1. Sulphur, Phosphorous and Sodium
2. Phosphorous, Sodium and Nitrogen
3. Nitrogen, Potassium and Phosphorous
4. Calcium, Phosphorous and Potassium

Select Answer

Correct Answer: ( C )  

Question No.8

An atomic pile is used for

1. producing X-rays
2. conducting nuclear fission
3. conducting thermonuclear fusion
4. accelerating atoms

Select Answer

Correct Answer: ( B )  

Question No.9

Milk is a colloidal system in which:

1. Water is dispersed in fat
2. Fat is dispersed in water
3. Fat and water are dispersed in each other
4. Fat is dissolved

Select Answer

Correct Answer: ( B )  

Question No.10

Cement is made hard with

1. dehydration
2. Dissociation of water
3. Polymerisation
4. hydration and dissociation of water

Select Answer

Correct Answer: ( D )  

Question No.11

Soap is prepared by boiling caustic soda with

1. Alcohol
2. Kerosene oil
3. Glycerine
4. Fats

Select Answer

Correct Answer: ( D )  

Question No.12

The acid used in lead storage cells is

1. phosphoric acid
2. sulphuric acid
3. hydrochloric acid
4. nitric acid

Select Answer

Correct Answer: ( B )  

Question No.13

Which among the following is a carbohydrate ?

1. Nylon
2. Cane-sugar
3. Turpentine
4. Hydrogen peroxide

Select Answer

Correct Answer: ( B )  

Question No.14

When there are two electrons in the same orbital, they have:

1. same spin
2. opposite spin
3. same or opposite spin
4. no spin

Select Answer

Correct Answer: ( B )  

Question No.15

What happens when a chemical bond is formed ?

1. energy is always absorbed
2. energy in always released
3. more energy is released than is absorbed
4. energy is neither released nor absorbed

Select Answer

Correct Answer: ( A )  

Question No.16

Silk fibre chemically is :

1. Carbohydrate
2. Fat
3. Protein
4. Cellulose

Select Answer

Correct Answer: ( C )  

Question No.17

The substance which does not expand on going from liquid state to solid state is

1. Water
2. Cast-iron
3. Aluminium
4. Type metal

Select Answer

Correct Answer: ( D )  

Type metal, alloy of lead, antimony, and tin are used to make type characters for printing.

Question No.18

Where does the oxygen that keeps us alive come from?

1. Carbon dioxide
2. Carbonates absorbed from soil
3. Oxides of minerals
4. Water

Select Answer

Correct Answer: ( D )  

Question No.19

Commercial nitric acid is coloured because it contains dissolved

1. Oxygen
2. Nitrous oxide
3. Nitrogen dioxide
4. Coloured impurities

Select Answer

Correct Answer: ( C )  

Question No.20

In which of the following states maximum iron ore is found ?

1. FeCO₃
2. Fe₂O₃
3. Fe₃O₄
4. FeS₂

Select Answer

Correct Answer: ( B )  

Fe₂O₃ is called Ferric oxide or Hematite. It is a Red-brown solid.Insoluble in water and soluble in strong acid. Oxidation state: +3.

Fe₃O₄ is called Ferrous ferric oxide or Magnetite.It is Black, gray with brownish tint in reflected sun. Oxidation state: +2 and +3

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