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CHXI09:HYDROGEN

315508 Hydrogen gas is not liberated when the following metal added to dil. $HCl$ ?

1

Mg

2

Sn

3

Ag

4

Zn

Explanation:

Reduction potential of Ag is more than other given species, so Ag has greater tendency to get reduced on comparison to other species, hence does not liberate hydrogen gas when added to dil $HCl$ .

KCET - 2008

CHXI09:HYDROGEN

315509 supporting img
Based on this data, find the value of $(x - y)$ [Given: atomic masses of $H = 1, Li = 7$ . $O = 16, Ca = 40 u]$

1 26

2 46

3 16

4 56

Explanation:

$\underset{1 mol}{{CaH}_{2}} + 2 H_{2} O ⟶ Ca (OH)_{2} + \underset{(2 mol)}{2 H_{2}}$
From reaction stoichiometry,
$1 mol {CaH}_{2} \equiv 2 mol H_{2}$
$∴ 42 g {CaH}_{2} \equiv 2 mol H_{2}$ .
$∴$ $x = 42$
$\underset{1 mol}{LiH} + H_{2} O \to LiOH + \underset{1 mol}{H_{2}}$
From reaction stoichiometry,
$1 mol LiH \equiv 1 mol H_{2}$
$∴ 2 mol LiH \equiv 2 mol H_{2}$
$∴ 16 g LiH \equiv 2 mol H_{2}$
$∴ y = 16$
$∴$ Value of $(x - y) = 42 - 16 = 26$

CHXI09:HYDROGEN

315510 Hydrogen economy refer to -

1 economical use of hydrogen

2 use of hydrogen as fuel

3 earning foreign currency

4 hydrogen dependent economy

CHXI09:HYDROGEN

315511 The catalyst used in process of manufacture of $H_{2}$ from water gas is -

1 Finely divided

Ni

2

V_{2} O_{5}

3

Pb

4

{Fe}_{2} O_{3} + {Cr}_{2} O_{3}

CHXI09:HYDROGEN

315508 Hydrogen gas is not liberated when the following metal added to dil. $HCl$ ?

1

Mg

2

Sn

3

Ag

4

Zn

Explanation:

Reduction potential of Ag is more than other given species, so Ag has greater tendency to get reduced on comparison to other species, hence does not liberate hydrogen gas when added to dil $HCl$ .

KCET - 2008

CHXI09:HYDROGEN

315509 supporting img
Based on this data, find the value of $(x - y)$ [Given: atomic masses of $H = 1, Li = 7$ . $O = 16, Ca = 40 u]$

1 26

2 46

3 16

4 56

Explanation:

$\underset{1 mol}{{CaH}_{2}} + 2 H_{2} O ⟶ Ca (OH)_{2} + \underset{(2 mol)}{2 H_{2}}$
From reaction stoichiometry,
$1 mol {CaH}_{2} \equiv 2 mol H_{2}$
$∴ 42 g {CaH}_{2} \equiv 2 mol H_{2}$ .
$∴$ $x = 42$
$\underset{1 mol}{LiH} + H_{2} O \to LiOH + \underset{1 mol}{H_{2}}$
From reaction stoichiometry,
$1 mol LiH \equiv 1 mol H_{2}$
$∴ 2 mol LiH \equiv 2 mol H_{2}$
$∴ 16 g LiH \equiv 2 mol H_{2}$
$∴ y = 16$
$∴$ Value of $(x - y) = 42 - 16 = 26$

CHXI09:HYDROGEN

315510 Hydrogen economy refer to -

1 economical use of hydrogen

2 use of hydrogen as fuel

3 earning foreign currency

4 hydrogen dependent economy

CHXI09:HYDROGEN

315511 The catalyst used in process of manufacture of $H_{2}$ from water gas is -

1 Finely divided

Ni

2

V_{2} O_{5}

3

Pb

4

{Fe}_{2} O_{3} + {Cr}_{2} O_{3}

CHXI09:HYDROGEN

315508 Hydrogen gas is not liberated when the following metal added to dil. $HCl$ ?

1

Mg

2

Sn

3

Ag

4

Zn

Explanation:

Reduction potential of Ag is more than other given species, so Ag has greater tendency to get reduced on comparison to other species, hence does not liberate hydrogen gas when added to dil $HCl$ .

KCET - 2008

CHXI09:HYDROGEN

315509 supporting img
Based on this data, find the value of $(x - y)$ [Given: atomic masses of $H = 1, Li = 7$ . $O = 16, Ca = 40 u]$

1 26

2 46

3 16

4 56

Explanation:

$\underset{1 mol}{{CaH}_{2}} + 2 H_{2} O ⟶ Ca (OH)_{2} + \underset{(2 mol)}{2 H_{2}}$
From reaction stoichiometry,
$1 mol {CaH}_{2} \equiv 2 mol H_{2}$
$∴ 42 g {CaH}_{2} \equiv 2 mol H_{2}$ .
$∴$ $x = 42$
$\underset{1 mol}{LiH} + H_{2} O \to LiOH + \underset{1 mol}{H_{2}}$
From reaction stoichiometry,
$1 mol LiH \equiv 1 mol H_{2}$
$∴ 2 mol LiH \equiv 2 mol H_{2}$
$∴ 16 g LiH \equiv 2 mol H_{2}$
$∴ y = 16$
$∴$ Value of $(x - y) = 42 - 16 = 26$

CHXI09:HYDROGEN

315510 Hydrogen economy refer to -

1 economical use of hydrogen

2 use of hydrogen as fuel

3 earning foreign currency

4 hydrogen dependent economy

CHXI09:HYDROGEN

315511 The catalyst used in process of manufacture of $H_{2}$ from water gas is -

1 Finely divided

Ni

2

V_{2} O_{5}

3

Pb

4

{Fe}_{2} O_{3} + {Cr}_{2} O_{3}

CHXI09:HYDROGEN

315508 Hydrogen gas is not liberated when the following metal added to dil. $HCl$ ?

1

Mg

2

Sn

3

Ag

4

Zn

Explanation:

Reduction potential of Ag is more than other given species, so Ag has greater tendency to get reduced on comparison to other species, hence does not liberate hydrogen gas when added to dil $HCl$ .

KCET - 2008

CHXI09:HYDROGEN

315509 supporting img
Based on this data, find the value of $(x - y)$ [Given: atomic masses of $H = 1, Li = 7$ . $O = 16, Ca = 40 u]$

1 26

2 46

3 16

4 56

Explanation:

$\underset{1 mol}{{CaH}_{2}} + 2 H_{2} O ⟶ Ca (OH)_{2} + \underset{(2 mol)}{2 H_{2}}$
From reaction stoichiometry,
$1 mol {CaH}_{2} \equiv 2 mol H_{2}$
$∴ 42 g {CaH}_{2} \equiv 2 mol H_{2}$ .
$∴$ $x = 42$
$\underset{1 mol}{LiH} + H_{2} O \to LiOH + \underset{1 mol}{H_{2}}$
From reaction stoichiometry,
$1 mol LiH \equiv 1 mol H_{2}$
$∴ 2 mol LiH \equiv 2 mol H_{2}$
$∴ 16 g LiH \equiv 2 mol H_{2}$
$∴ y = 16$
$∴$ Value of $(x - y) = 42 - 16 = 26$

CHXI09:HYDROGEN

315510 Hydrogen economy refer to -

1 economical use of hydrogen

2 use of hydrogen as fuel

3 earning foreign currency

4 hydrogen dependent economy

CHXI09:HYDROGEN

315511 The catalyst used in process of manufacture of $H_{2}$ from water gas is -

1 Finely divided

Ni

2

V_{2} O_{5}

3

Pb

4

{Fe}_{2} O_{3} + {Cr}_{2} O_{3}

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