Hydrogen [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Chemistry]: Questions 20 - 25 of 86

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Question 20

Question MCQ▾

20 ml of a sample of H2O2 gives 400 ml of oxygen measured at NTP. The sample should be labeled as:

Choices

Choice (4)Response

a.

Anhydrous H2O2

b.

Dil. H2O2

c.

20 vol. H2O2

d.

5 vol. H2O2

Edit

Question 21

Question MCQ▾

Hard water is not suitable for washing clothes because?

Choices

Choice (4)Response

a.

It contains impurities

b.

It gives insoluble precipitates

c.

It is acidic in nature

d.

It contains Na2SO4 and KCl

Edit

Question 22

Question MCQ▾

2 g of aluminum is treated separately with excess of dilute sulphuric acid and excess of NaOH. The ratio of volumes of hydrogen evolved under similar conditions of pressure and temperature is?

Choices

Choice (4)Response

a.

1: 3

b.

1: 1

c.

2: 1

d.

3: 1

Edit

Question 23

Question MCQ▾

Water can extinguish most fires but not petrol fire, because?

Choices

Choice (4)Response

a.

water is lighter than petrol

b.

Hydrogen bonding

c.

petrol is lighter than water

d.

Question does not provide sufficient data or is vague

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Question 24

Question MCQ▾

In alkaline medium, H2O2 reacts with Fe+ 3 and Mn+ 2 separately to give?

Choices

Choice (4)Response

a.

b.

c.

d.

Edit

Question 25

Question MCQ▾

The temporary hardness of water due to calcium bicarbonate can be removed by adding?

Choices

Choice (4)Response

a.

Calcium carbonate

b.

Calcium chloride

c.

Calcium hydroxide

d.

Hydrochloric acid

Edit