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CHXI09:HYDROGEN

315473 On earth hydrogen is rarely found in its uncombined state because

1 It is highly inflammable

2 It combines with oxygen to give water

3 The earth's gravity is too weak to hold such light molecules

4 It has three isotopes.

CHXI09:HYDROGEN

315474 An element reacts with hydrogen to form a compound ' $A$ ' which on treatment with water liberates hydrogen gas. The element can be

1 nitrogen

2 chlorine

3 calcium

4 selenium

Explanation:

$Ca + H_{2} ⟶ {CaH}_{2}$ ${CaH}_{2} + 2 H_{2} O ⟶ Ca (OH)_{2} + 2 H_{2}$
It is due to both decomposition and oxidising nature.

CHXI09:HYDROGEN

315475 Among the following, the correct statement regarding hydrogen is

1 it can form compounds with +1 as well as

- 1

oxidation states.

2 it is always collected at cathode.

3 it has very high ionization energy.

4 it has same electronegativity as halogens.

CHXI09:HYDROGEN

315476 Bond dissociation enthalpies of $H - H, D - D$ and $F - F$ in increasing order is

1

H_{2} > D_{2} > F_{2}

2

D_{2} > F_{2} > H_{2}

3

D_{2} > H_{2} > F_{2}

4

F_{2} > D_{2} > H_{2}

CHXI09:HYDROGEN

315500 Why is water gas (mixture of $CO$ and $H_{2}$ ) also called 'syn gas'?

1 Because it is synthesised from sewage, saw - dust, scrap wood etc.

2 Because it is synthesised from methane gas

3 Because it is used in the synthesis of methanol and a number of hydrocarbons

4 None of these

Explanation:

Mixture of $CO$ and $H_{2}$ is used in synthesis of methanol and a number of hydrocarbons due to this reason it is also called syn gas.

CHXI09:HYDROGEN

315473 On earth hydrogen is rarely found in its uncombined state because

1 It is highly inflammable

2 It combines with oxygen to give water

3 The earth's gravity is too weak to hold such light molecules

4 It has three isotopes.

CHXI09:HYDROGEN

315474 An element reacts with hydrogen to form a compound ' $A$ ' which on treatment with water liberates hydrogen gas. The element can be

1 nitrogen

2 chlorine

3 calcium

4 selenium

Explanation:

$Ca + H_{2} ⟶ {CaH}_{2}$ ${CaH}_{2} + 2 H_{2} O ⟶ Ca (OH)_{2} + 2 H_{2}$
It is due to both decomposition and oxidising nature.

CHXI09:HYDROGEN

315475 Among the following, the correct statement regarding hydrogen is

1 it can form compounds with +1 as well as

- 1

oxidation states.

2 it is always collected at cathode.

3 it has very high ionization energy.

4 it has same electronegativity as halogens.

CHXI09:HYDROGEN

315476 Bond dissociation enthalpies of $H - H, D - D$ and $F - F$ in increasing order is

1

H_{2} > D_{2} > F_{2}

2

D_{2} > F_{2} > H_{2}

3

D_{2} > H_{2} > F_{2}

4

F_{2} > D_{2} > H_{2}

CHXI09:HYDROGEN

315500 Why is water gas (mixture of $CO$ and $H_{2}$ ) also called 'syn gas'?

1 Because it is synthesised from sewage, saw - dust, scrap wood etc.

2 Because it is synthesised from methane gas

3 Because it is used in the synthesis of methanol and a number of hydrocarbons

4 None of these

Explanation:

Mixture of $CO$ and $H_{2}$ is used in synthesis of methanol and a number of hydrocarbons due to this reason it is also called syn gas.

CHXI09:HYDROGEN

315473 On earth hydrogen is rarely found in its uncombined state because

1 It is highly inflammable

2 It combines with oxygen to give water

3 The earth's gravity is too weak to hold such light molecules

4 It has three isotopes.

CHXI09:HYDROGEN

315474 An element reacts with hydrogen to form a compound ' $A$ ' which on treatment with water liberates hydrogen gas. The element can be

1 nitrogen

2 chlorine

3 calcium

4 selenium

Explanation:

$Ca + H_{2} ⟶ {CaH}_{2}$ ${CaH}_{2} + 2 H_{2} O ⟶ Ca (OH)_{2} + 2 H_{2}$
It is due to both decomposition and oxidising nature.

CHXI09:HYDROGEN

315475 Among the following, the correct statement regarding hydrogen is

1 it can form compounds with +1 as well as

- 1

oxidation states.

2 it is always collected at cathode.

3 it has very high ionization energy.

4 it has same electronegativity as halogens.

CHXI09:HYDROGEN

315476 Bond dissociation enthalpies of $H - H, D - D$ and $F - F$ in increasing order is

1

H_{2} > D_{2} > F_{2}

2

D_{2} > F_{2} > H_{2}

3

D_{2} > H_{2} > F_{2}

4

F_{2} > D_{2} > H_{2}

CHXI09:HYDROGEN

315500 Why is water gas (mixture of $CO$ and $H_{2}$ ) also called 'syn gas'?

1 Because it is synthesised from sewage, saw - dust, scrap wood etc.

2 Because it is synthesised from methane gas

3 Because it is used in the synthesis of methanol and a number of hydrocarbons

4 None of these

Explanation:

Mixture of $CO$ and $H_{2}$ is used in synthesis of methanol and a number of hydrocarbons due to this reason it is also called syn gas.

CHXI09:HYDROGEN

315473 On earth hydrogen is rarely found in its uncombined state because

1 It is highly inflammable

2 It combines with oxygen to give water

3 The earth's gravity is too weak to hold such light molecules

4 It has three isotopes.

CHXI09:HYDROGEN

315474 An element reacts with hydrogen to form a compound ' $A$ ' which on treatment with water liberates hydrogen gas. The element can be

1 nitrogen

2 chlorine

3 calcium

4 selenium

Explanation:

$Ca + H_{2} ⟶ {CaH}_{2}$ ${CaH}_{2} + 2 H_{2} O ⟶ Ca (OH)_{2} + 2 H_{2}$
It is due to both decomposition and oxidising nature.

CHXI09:HYDROGEN

315475 Among the following, the correct statement regarding hydrogen is

1 it can form compounds with +1 as well as

- 1

oxidation states.

2 it is always collected at cathode.

3 it has very high ionization energy.

4 it has same electronegativity as halogens.

CHXI09:HYDROGEN

315476 Bond dissociation enthalpies of $H - H, D - D$ and $F - F$ in increasing order is

1

H_{2} > D_{2} > F_{2}

2

D_{2} > F_{2} > H_{2}

3

D_{2} > H_{2} > F_{2}

4

F_{2} > D_{2} > H_{2}

CHXI09:HYDROGEN

315500 Why is water gas (mixture of $CO$ and $H_{2}$ ) also called 'syn gas'?

1 Because it is synthesised from sewage, saw - dust, scrap wood etc.

2 Because it is synthesised from methane gas

3 Because it is used in the synthesis of methanol and a number of hydrocarbons

4 None of these

Explanation:

Mixture of $CO$ and $H_{2}$ is used in synthesis of methanol and a number of hydrocarbons due to this reason it is also called syn gas.

CHXI09:HYDROGEN

315473 On earth hydrogen is rarely found in its uncombined state because

1 It is highly inflammable

2 It combines with oxygen to give water

3 The earth's gravity is too weak to hold such light molecules

4 It has three isotopes.

CHXI09:HYDROGEN

315474 An element reacts with hydrogen to form a compound ' $A$ ' which on treatment with water liberates hydrogen gas. The element can be

1 nitrogen

2 chlorine

3 calcium

4 selenium

Explanation:

$Ca + H_{2} ⟶ {CaH}_{2}$ ${CaH}_{2} + 2 H_{2} O ⟶ Ca (OH)_{2} + 2 H_{2}$
It is due to both decomposition and oxidising nature.

CHXI09:HYDROGEN

315475 Among the following, the correct statement regarding hydrogen is

1 it can form compounds with +1 as well as

- 1

oxidation states.

2 it is always collected at cathode.

3 it has very high ionization energy.

4 it has same electronegativity as halogens.

CHXI09:HYDROGEN

315476 Bond dissociation enthalpies of $H - H, D - D$ and $F - F$ in increasing order is

1

H_{2} > D_{2} > F_{2}

2

D_{2} > F_{2} > H_{2}

3

D_{2} > H_{2} > F_{2}

4

F_{2} > D_{2} > H_{2}

CHXI09:HYDROGEN

315500 Why is water gas (mixture of $CO$ and $H_{2}$ ) also called 'syn gas'?

1 Because it is synthesised from sewage, saw - dust, scrap wood etc.

2 Because it is synthesised from methane gas

3 Because it is used in the synthesis of methanol and a number of hydrocarbons

4 None of these

Explanation:

Mixture of $CO$ and $H_{2}$ is used in synthesis of methanol and a number of hydrocarbons due to this reason it is also called syn gas.

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