Match List-I with List-II

List I (Process)

1. Heating Camphor
2. Cooling of water vapour up to room temperature
3. Cooking an egg
4. Formation of water vapour at room temperature

List II (Type of change)

1. Chemical
2. Evaporation
3. Condensation
4. Sublimation

• (a) - 4, (b) - 3, (c) - 1, (d) - 2

• (a) - 4, (b) - 1, (c) - 3, (d) - 2

• (a) - 2, (b) - 1, (c) - 3, (d) - 4

• (a) - 2, (b) - 3, (c) - 1, (d) - 4

Identify the element having zero valency:

• Sulphur

• Phosphorous

• Lead

• Radon

There are six electrons, six protons and six neutrons in an atom of an element. What is the atomic number of the element?

• 6

• 12

• 18

• 24

Which one of the following has different number of molecules? (All are kept at normal temperature and pressure)

• 3 gram of Hydrogen

• 48 gram of Oxygen

• 42 gram of Nitrogen

• 2 gram of Carbon

Statement I and Statement II. You are to examine these two statements carefully and select the answers to these items using the code given below :

Statement I: The granules of modern gunpowder (also called black powder) are typically coated with Graphite.

Statement II: Graphite prevents the build-up of electrostatic charge.

• Both the statements are individually true and Statement II is the correct explanation of Statement I.

• Both the statements are individually true but Statement II is not the correct explanation of Statement I

• Statement I is true but Statement II is false

• Statement I is false but Statement II is true

Statement I and Statement II. You are to examine these two statements carefully and select the answers to these items using the code given below :

Statement I: Colour of nitroge, dioxide changes to colourless at low temperature.

Statement II: At low temperature Nitrogen tctroxide (N₂O₄) is formed which is colourless.

• Both the statements are individually true and Statement II is the correct explanation of Statement I.

• Both the statements are individually true but Statement II is not the correct explanation of Statement I

• Statement I is true but Statement II is false

• Statement I is false but Statement II is true

Statement I and Statement II. You are to examine these two statements carefully and select the answers to these items using the code given below :

Statement I: Oxygen gas is easily produced at a faster rate by heating a mixture of potassium chlorate and manganese dioxide than heating potassium chlorate alone.

Statement II: Manganese dioxide acts as a negative catalyst.

• Both the statements are individually true and Statement II is the correct explanation of Statement I.

• Both the statements are individually true but Statement II is not the correct explanation of Statement I

• Statement I is true but Statement II is false

• Statement I is false but Statement II is true

Match List-I with List-II

List I (Compound)

1. Sodium hydroxide
2. Calcium oxide
3. Acetic acid
4. Hydrochloric acid

List II (Nature)

1. Strong acid
2. Alkali
3. Weak acid
4. Base

• (a) - 2, (b) - 3, (c) - 4, (d) - 1

• (a) - 2, (b) - 4, (c) - 3, (d) - 1

• (a) - 1, (b) - 4, (c) - 3, (d) - 2

• (a) - 1, (b) - 3, (c) - 4, (d) - 2

119.

Which one among the following is used in making gunpowder?

• Magnesium sulphate

• Potassium nitrate

• Sodium stearate

• Calcium sulphate

The cleaning action of soap and detergent in water is due to the formation of

• Micelle

• Salt

• Base

• Acid