Examine the statements and choose the correct alternative

Statement I: Water (H₂O) is more polar than Hydrogen Sulphide (H₂S).

Statement II: Oxygen is more electronegative than Sulphur.

• 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

Examine the statements and choose the correct alternative

Statement I: Metal ions are Lewis acids.

Statement II: Metal ions are electron-pair acceptors.

• 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

Examine the statements and choose the correct alternative

Statement I: Diamond is very hard and has a high melting point.

Statement II: In diamond, each carbon is covalently bonded to four other carbon atoms to form a three-dimensional network.

• 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

Bases turn red litmus blue and acids turn blue litmus red. A student tested a liquid with a red litmus paper and it stayed red with no change. This shows that the liquid

• must be pure water

• must be an acid

• is not a base

• is neither a base nor an acid

The main constituent of vinegar is

• Citric acid

• Acetic acid

• Ascorbic acid

• Tartaric acid

The major component used in the preparation of different types of glasses is

• Silica

• Sodium borate

• Calcium silicate

• Sodium silicate

All the elements in a group (family) have a common valency. For example, all the elements of the carbon family (carbon, silicon, germanium, tin, and lead) have common valency four. However, some of these elements can also have valency two. Which of the following can have valency two?

• Silicon, germanium and tin

• Only germanium and tin

• Germanium, tin and lead

• Only tin and lead

Match List-I with List-II

List I (Metallic oxide)

1. Uranium oxide
2. Cuprous oxide
3. Cobalt oxide
4. Chromium oxide

List II: (Colour imparted to glass)

1. Red
2. Blue
3. Green
4. Yellow

• (a) - 4, (b) - 1, (c) - 2, (d) - 3

• (a) - 3, (b) - 2, (c) - 1, (d) - 4

• (a) - 4, (b) - 2, (c) - 1, (d) - 3

• (a) - 3, (b) - 1, (c) - 2, (d) - 4

Protons and neutrons are bound in a nucleus by the

• short-range 'weak interaction'

• short-range 'strong interaction'

• long-range 'electromagnetic interaction'

• long-range 'gravitational interaction'

220.

Thermometer A and B have ice points marked at 15° and 25° and steam points at 75° and 125° respectively. When thermometer A measures the temperature of a bath at 60°, the reading of B for the same bath is

• 60°

• 75°

• 90°

• 100°