Hydrogen Test

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Hydrogen Test - 71

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Weekly Quiz Competition

Question 1
1 / -0

HCl is added to following oxides. Which one would give $$ H_{2}O_{2} $$?

A
$$ MnO_{2} $$

B
$$ PbO_{2} $$

C
$$ BaO $$

D
None of these

Solution

$$ MnO_{2},\ PbO_{2} $$ and $$BaO$$ will not give $$ H_{2}O_{2} $$ with $$HCl.$$

$$ MnO_{2} $$ and $$ PbO_{2} $$ will give $$H_2O_2$$ with $$ Cl_{2} $$ and $$BaO$$ will react with $$HCl$$ to give $$ BaCl_{2} $$ and water.
Question 2
1 / -0

$$ H_{2}O_{2} $$ is manufactured these days

A
By the action of $$ H_{2}O_{2} $$ and $$ BaO_{2} $$

B
By the action of $$ H_{2}SO_{4} $$ on $$ Na_{2}O_{2} $$

C
By electrolysis of 50% $$ H_{2}SO_{4} $$

D
By burning hydrogen in excess of oxygen

Solution

Electrolysis of 50% sulphuric acid gives per disulphuric acid $$ \left ( H_{2}S_{2}O_{8} \right ) $$ which on distillation yields 30% solution of hydrogen peroxide.

$$H_2S_2O_8 + 2H_2O \xrightarrow{Electrolysis} 2H_2SO_4 + H_2O_2$$
Question 3
1 / -0

Saline hydrides react explosively with water, such fires can be extinguished by

A
Water

B
Carbon dioxide

C
Sand

D
None of these

Solution

Fire due to action of water on saline hydrides cannot be extinguished with water or $$ CO_{2} $$. These hydrides can reduce $$ CO_{2} $$ at high temperature to produce $$ O_{2} $$. So, sand is used to extinguish the fire.
Question 4
1 / -0

Hydrogen can be produced by heating

A
Cu with $$ H_{2}SO_{4} $$

B
Sodium formate

C
Sodium oxalate

D
None of these

Solution

Hydrogen can be produced by heating Sodium formate. Hydrogen gas and Sodium oxalate is formed as product.
Question 5
1 / -0

The oxide that gives H$$_2$$O$$_2$$ on treatment with dilute H$$_2$$SO$$_4$$ is -

A
PbO$$_2$$

B
BaO$$_2$$.8H$$_2$$O $$+$$ O$$_2$$

C
MnO$$_2$$

D
TiO$$_2$$

Solution

Acidifying barium peroxide on removing excess water by evaporation under reduced pressure gives hydrogen perioxide.
Question 6
1 / -0

Fill in the blanks:
Every nine parts of water by weight contains eight parts by weight of ______.

A
oxygen

B
helium

C
carbonic

D
sulphur dioxide gas

Solution
Question 7
1 / -0

In ice, the length of H-bonds :

A
is less than that of covalent bonds

B
is greater than that of covalent bonds

C
is same as that of covalent bonds

D
can be less greater or same as that of covalent bonds

Solution

The length of H bonds is greater than covalent bonds because as covalent bond there is within molecule and attraction makes atom closer while in H bonding is with neighbour atom and due to repulsion between center atom makes molecule apart that's why H bond length is greater.
Question 8
1 / -0

Which of the following is not true about $$H_{2} O$$ molecule?

A
The molecule has $$\mu= 0.$$

B
The molecule can act as a base.

C
Shows abnormally high boiling point in comparison to the hydrides of other elements of the oxygen group.

D
The molecule has a bent shape.

Solution
Question 9
1 / -0

Select the incorrect statement from the following:

A
$$H^{+}$$ can exist as $$H_{9}O_{4}^{+}$$ in water.

B
$$H_{2}$$ is thermally stable.

C
Ionisation of $$CH_{3}COOH$$ is slower than that of $$CH_{3}COOD$$

D
Kinetic isotopic effect is observed when there is retardation in the rate if $$H_{2}O$$ is replaced by $$D_{2}O$$
Question 10
1 / -0

Which of the following hydrides is least stable to hydrolysis ?

A
$$CH_{4}$$

B
$$SiH_{4}$$

C
$$SnH_{4}$$

D
$$PbH_{4}$$

Solution

Silicon hydrides are most easily hydrolysed.
$$SiH_{4} + 3H_{2}O \rightarrow H_{2}SiO_{3} + 4H_{2}$$
$$SiH_{4} + 2NaOh + H_{2}O \rightarrow Na_{2}SiO_{3} + 4H_{2}$$

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Re-Attempt Weekly Quiz Competition

Hydrogen Test - 71

Result

Hydrogen Test - 71

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SHARING IS CARING

Question 1

$$ MnO_{2} $$

$$ PbO_{2} $$

$$ BaO $$

None of these

Solution

Question 2

By the action of $$ H_{2}O_{2} $$ and $$ BaO_{2} $$

By the action of $$ H_{2}SO_{4} $$ on $$ Na_{2}O_{2} $$

By electrolysis of 50% $$ H_{2}SO_{4} $$

By burning hydrogen in excess of oxygen

Solution

Question 3

Water

Carbon dioxide

Sand

None of these

Solution

Question 4

Cu with $$ H_{2}SO_{4} $$

Sodium formate

Sodium oxalate

None of these

Solution

Question 5

PbO$$_2$$

BaO$$_2$$.8H$$_2$$O $$+$$ O$$_2$$

MnO$$_2$$

TiO$$_2$$

Solution

Question 6

oxygen

helium

carbonic

sulphur dioxide gas

Solution

Question 7

is less than that of covalent bonds

is greater than that of covalent bonds

is same as that of covalent bonds

can be less greater or same as that of covalent bonds

Solution

Question 8

The molecule has $$\mu= 0.$$

The molecule can act as a base.

Shows abnormally high boiling point in comparison to the hydrides of other elements of the oxygen group.

The molecule has a bent shape.

Solution

Question 9

$$H^{+}$$ can exist as $$H_{9}O_{4}^{+}$$ in water.

$$H_{2}$$ is thermally stable.

Ionisation of $$CH_{3}COOH$$ is slower than that of $$CH_{3}COOD$$

Kinetic isotopic effect is observed when there is retardation in the rate if $$H_{2}O$$ is replaced by $$D_{2}O$$

Question 10

$$CH_{4}$$

$$SiH_{4}$$

$$SnH_{4}$$

$$PbH_{4}$$

Solution

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