Alpha Question Bank for Engineering: Chemistry>Chapter 15 - Hydrogen>Exercise-3>Q 6

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The total number of isotopes of hydrogen and number of radioactive isotopes among them, respectively, are

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Important Questions on Hydrogen

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Alpha Question Bank for Engineering: Chemistry>Chapter 15 - Hydrogen>Exercise-3>Q 7

NaH

is an example of:

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Alpha Question Bank for Engineering: Chemistry>Chapter 15 - Hydrogen>Exercise-3>Q 8

The correct statements among

(a)

to

(d)

regarding

H_{2}

as a fuel are:

(a)

It produces less pollutants than petrol

(b)

A cylinder of compressed dihydrogen weighs

\sim 30

times more than a petrol tank producing the same amount of energy

(c)

Dihydrogen is stored in tanks of metal alloys like

N a N i_{5}

(d)

On combustion, values of energy released per gram of liquid dihydrogen and LPG are

50

and

142 k J

, respectively

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Alpha Question Bank for Engineering: Chemistry>Chapter 15 - Hydrogen>Exercise-3>Q 9

The correct statements among

(a)

to

(d)

are:

(a)

Saline hydrides produce

H_{2}

gas when reacted with

H_{2} O .

(b)

Reaction of

L i A l H_{4}

with

B F_{3}

leads to

B_{2} H_{6}

.

(c)

P H_{3}

and

C H_{4}

are electron - rich and electron - precise hydrides, respectively.

(d)

H F

and

C H_{4}

are called as molecular hydrides.

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Alpha Question Bank for Engineering: Chemistry>Chapter 15 - Hydrogen>Exercise-3>Q 11

When zeolite, which is hydrated sodium aluminium silicate, is treated with hard water, the sodium ions are exchanged with

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Alpha Question Bank for Engineering: Chemistry>Chapter 15 - Hydrogen>Exercise-3>Q 12

Polyphosphates are used as water softening agents because they

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Alpha Question Bank for Engineering: Chemistry>Chapter 15 - Hydrogen>Exercise-3>Q 13

A white solid is either Na₂O or Na₂O₂. A piece of red litmus paper turns white when it is dipped into a freshly made aqueous solution of the white solid.
(i) Identify the substance and explain with balanced equation.
(ii) Explain what would happen to the red litmus if the white solid were the other compound.

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Alpha Question Bank for Engineering: Chemistry>Chapter 15 - Hydrogen>Exercise-3>Q 14

Hydorgen peroxide acts both as an oxidising and as a reducing agent depending upon the nature of the reacting species. In which of the following cases