Hydrogen Test

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Hydrogen Test - 70

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Weekly Quiz Competition

Question 1
1 / -0

When $$ NaBH_{4} $$ is dissolves in water

A
It decomposes with the evolution of $$ H_{2} $$

B
$$ Na^{+} $$ and $$ BH^{-}_{4} $$ are formed which are stable

C
$$ BH^{-}_{4} $$ ions formed initially decompose to produce $$ OH^{-} $$ ions, which prevent future decomposition

D
$$NaH$$ and $$ B_{2}H_{6} $$ are produced

Solution

When $$ NaBH_{4} $$ is dissolves in water it decomposes with the evolution of $$ H_{2} $$ and the reaction is as follows:

$$NaBH_4+2H_2O\to NaBO_2+4H_2$$
Question 2
1 / -0

The hydride ion $$ H^{-} $$ is a stronger base than its hydroxide ion $$OH^{-} $$ . Which of the following reactions will occur if sodium hydride ($$NaH$$) is dissolved in water

A
$$ H^{-}(aq)+H_{2}O\rightarrow H_{3}O^{-}(aq) $$

B
$$ H^{-}(aq)+H_{2}O(l)\rightarrow OH^{-}(aq)+H_{2}(g) $$

C
$$ H^{-}(aq)+H_{2}O(l)\rightarrow $$ No reaction

D
None of these

Solution

If sodium hydride (NaH) is dissolved in water the following reaction occurs:

$$NaH\to Na^+(aq)+H^-(aq)$$

$$ H^{-}(aq)+H_{2}O(l)\rightarrow OH^{-}(aq)+H_{2}(g) $$
Question 3
1 / -0

In lab $$ H_{2}O_{2} $$ is prepared by

A
Cold $$ H_{2}SO_{4}+BaO_{2} $$

B
$$ HCl+BaO_{2} $$

C
Conc.$$ H_{2}SO_{4}+Na_{2}O_{2} $$

D
$$ H_{2}+O_{2} $$

Solution

Hydrogen peroxide can be prepared in the laboratory by the action of ice cold, dilute sulphuric acid on hydrated barium peroxide.

$$ H_{2}SO_{4}+BaO_{2}\rightarrow BaSO_{4}+H_{2}O_{2} $$
Question 4
1 / -0

Which of the following statements are correct?
(I) Both melting and boilling points of $$H_{2}O$$ are higher than those of $$H_{2} Te.$$
(II) In both $$N_{2}O_{5}$$ and $$N_{2}O_{4}$$ all $$N-O$$ bond lengths are equivalent.
(III) In both crystalline $$NaHCO_{3}$$ and $$KHCO_{3}$$, $$HCO_{3}^{-}$$ forms only dimeric anion through hydrogen bond.
(IV) Amongst $$B_{2}$$, $$C_{2}$$, $$N_{2}^{-}$$ and $$O_{2}$$, $$N_{2}^{-}$$ and $$ O_{2}$$ on further ionization (losing single electron)
thermodynamically more stable species is formed.

A
(I) and (II)

B
(III) and (IV)

C
(II) and (III)

D
(I) and (IV)

Solution
Question 5
1 / -0

Pure hydrogen is obtained by carrying electrolysis of

A
Water containing $$ H_{2}SO_{4} $$

B
Water containing $$NaOH$$

C
$$ Ba\left ( OH \right )_{2} $$ solution

D
$$KOH$$ solution

Solution

Pure hydrogen is obtained by the electrolysis of $$Ba(OH)_2$$ solution in a U-tube using nickel electrode. The gas is liberated at the cathode and is passed over heated platinum gauze to remove oxygen if present as impurity.
Question 6
1 / -0

Lead pipes are not used for carrying drinking water because

A
They are covered with a coating of lead carbonate

B
They are corroded by air and moisture

C
Water containing dissolved air attacks lead forming soluble hydroxide

D
None of these

Solution

Due to plumbosolvancy, lead dissolves in water to a small extent to form soluble hydroxide which is poisonous so lead pipe is not used for carrying drinking water.

Note: Plumbosolvency is the ability of a solvent, notably water, to dissolve lead.
Question 7
1 / -0

Limiting compositions of f-block hydrides are

A
$$ MH_{2} $$ and $$ MH_{3} $$

B
$$ MH_{3} $$ and $$ MH_{5} $$

C
$$ MH_{2} $$ and $$ MH_{8} $$

D
$$ MH_{2} $$ and $$ MH_{6} $$

Solution

Limiting compositions of f-block hydrides are $$MH_2$$ and $$MH_3$$.
Question 8
1 / -0

Plumbosolvency is a health hazard in the transportation of

A
Hard water only

B
Soft water only

C
Both (A) and (B)

D
Water containing plum juice

Solution

Presence of $$ CO^{2-}_{3} $$ and $$ SO^{2-}_{4} $$ ions in water reduce the tendency of dissolution of $$Pb$$ in water as $$ Pb(OH)_{2} .$$ So, Plumbosolvency is a health hazard in the transportation of soft water.
Question 9
1 / -0

Which of the following melts in boiling water ?

A
Gun metal

B
Wood's metal

C
Monel metal

D
Bell metal

E
None of these

Solution

Wood's metal melts in boiling water.
Hence, Option "B" is the correct answer.
Question 10
1 / -0

Which of the following pair will not produce dihydrogen gas?

A
$$Cu+HCl \text{(dil)}$$

B
$$ Fe+H_{2}SO_{4} $$

C
$$Mg\ +$$ steam

D
$$Na\ +$$ alcohol

Solution

Cu and dil.HCl will not produce $$ H_{2} $$ as Cu is less reactive than hydrogen.

$$Cu+HCl \to$$ No reaction

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Hydrogen Test - 70

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Hydrogen Test - 70

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Question 1

It decomposes with the evolution of $$ H_{2} $$

$$ Na^{+} $$ and $$ BH^{-}_{4} $$ are formed which are stable

$$ BH^{-}_{4} $$ ions formed initially decompose to produce $$ OH^{-} $$ ions, which prevent future decomposition

$$NaH$$ and $$ B_{2}H_{6} $$ are produced

Solution

Question 2

$$ H^{-}(aq)+H_{2}O\rightarrow H_{3}O^{-}(aq) $$

$$ H^{-}(aq)+H_{2}O(l)\rightarrow OH^{-}(aq)+H_{2}(g) $$

$$ H^{-}(aq)+H_{2}O(l)\rightarrow $$ No reaction

None of these

Solution

Question 3

Cold $$ H_{2}SO_{4}+BaO_{2} $$

$$ HCl+BaO_{2} $$

Conc.$$ H_{2}SO_{4}+Na_{2}O_{2} $$

$$ H_{2}+O_{2} $$

Solution

Question 4

(I) and (II)

(III) and (IV)

(II) and (III)

(I) and (IV)

Solution

Question 5

Water containing $$ H_{2}SO_{4} $$

Water containing $$NaOH$$

$$ Ba\left ( OH \right )_{2} $$ solution

$$KOH$$ solution

Solution

Question 6

They are covered with a coating of lead carbonate

They are corroded by air and moisture

Water containing dissolved air attacks lead forming soluble hydroxide

None of these

Solution

Question 7

$$ MH_{2} $$ and $$ MH_{3} $$

$$ MH_{3} $$ and $$ MH_{5} $$

$$ MH_{2} $$ and $$ MH_{8} $$

$$ MH_{2} $$ and $$ MH_{6} $$

Solution

Question 8

Hard water only

Soft water only

Both (A) and (B)

Water containing plum juice

Solution

Question 9

Gun metal

Wood's metal

Monel metal

Bell metal

None of these

Solution

Question 10

$$Cu+HCl \text{(dil)}$$

$$ Fe+H_{2}SO_{4} $$

$$Mg\ +$$ steam

$$Na\ +$$ alcohol

Solution

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