Hydrogen Test

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Hydrogen Test - 55

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Weekly Quiz Competition

Question 1
1 / -0

What is not true about ice?

A
It has open cage like structure

B
It has less density than water

C
Each O atom is surrounded by 4 H atoms

D
Each O atom has four H-bonds around it

Solution

Each O atom has two H-bonds around it as shown in the figure. Two H are bonded via covalent bond.
Question 2
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Identify X in the reaction: $$X + \underset{(steam)}{2H_{2}O} \overset{\Delta}{\longrightarrow} XO_{2} + 2H_{2}$$

A
$$C$$

B
$$Si$$

C
$$Ge$$

D
$$Sn$$

Solution

$$Sn + \underset{Steam}{2H_{2}O} \rightarrow SnO_{2} + 2H_{2}$$
Tin decomposes steam to form tin dioxide and hydrogen gas.
Question 3
1 / -0

Heavy water $$(D_2O)$$ freezes at

A
$$-3.8^o\ C$$

B
$$3.8^o\ C$$

C
$$0^o\ C$$

D
$$38^o\ C$$

Solution

ANSWER is $$ option$$ (B)
Heavy water freezes at $$3.8^o\ C$$.
Question 4
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Strength of $$10$$ volume hydrogen peroxide solution means

A
$$30.35\ g\ L^{-1}$$

B
$$17\ g\ L^{-1}$$

C
$$34\ g\ L^{-1}$$

D
$$68\ g\ L^{-1}$$

Solution

$$2H_2O_2\to 2H_2O+O_2$$

$$22.4\ O_2$$ is given by $$68\ g$$ of $$H_2O_2$$

$$10\ L\ O_2$$ is given by $$\dfrac {68}{22.4}\times 10=30.35\ g\ L^{-1}$$
Question 5
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Which is not a property of water?

A
It is a colourless and tasteless liquid.

B
There is no hydrogen bonding in solid state of water.

C
It is an excellent solvent for transportation of ions in plants and animals.

D
Frozen water is lighter than liquid water.

Solution

Option (B) There is extensive hydrogen bonding in solid state of water. is not a proprty of water.
Question 6
1 / -0

Water contains 88.89% of A by weight is decomposed into its elements B and oxygen. Pure C is a poor conductor of electricity and hence it is acidified using dilute sulphuric acid. When electric current is passed through acidulated water, using platinum electrones, hydrogen gas is evolved at cathode and oxygen gas is evolved at D.

What is D?

A
Anode

B
Cathode

C
Electrolyte

D
Catalyst

Solution

Percentage of oxygen in water

$$\displaystyle = \frac{weight\ of\ oxygen\ in\ water}{weight\ of\ water} \times 100$$

$$\displaystyle = \frac{16}{18} \times 100$$

$$=$$ 88.89%

Thus, water contains 88.89% of oxygen (A)

On decomposition of water we get hydrogen and oxygen.

So, B is hydrogen

Pure water is a poor conductor of electricity and when acidified by adding sulphuric acid it can conduct electricity hence, C is water.

During electrolysis of water, hydrogen gas is evolved at cathode and oxygen gas is evolved at anode.

Since at D oxygen gas is evolved D is anode.
Question 7
1 / -0

Water contains 88.89% of A by weight is decomposed into its elements B and oxygen. Pure C is a poor conductor of electricity and hence it is acidified using dilute sulphuric acid. When an electric current is passed through acidulated water, using platinum electrons, hydrogen gas is evolved at cathode and oxygen gas is evolved at D.

What is A?

A
Oxygen

B
Hydrogen

C
Water

D
Sulphuric acid

Solution

Percentage of oxygen in water

$$\displaystyle = \frac{weight\ of\ oxygen\ in\ water}{weight\ of\ water} \times 100$$

$$\displaystyle = \frac{16}{18} \times 100$$

$$=$$ 88.89%

Thus, water contains 88.89% of oxygen (A).
Question 8
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Saline hydrides:

A
are dehydrating agents

B
are formed by transition metals

C
are very poor reducing agents

D
are stable towards water and alcohol

Solution

Saline hydrides are formed by alkali metals and alkaline earth metals (not transition metals). They are good reducing agents and are readily decomposed by water and alcohol to liberate hydrogen. They also act as powerful dehydrating agents.
Question 9
1 / -0

Water contains 88.89% of A by weight is decomposed into its elements B and oxygen. Pure C is a poor conductor of electricity and hence it is acidified using dilute sulphuric acid. When electric current is passed through acidulated water, using platinum electrones, hydrogen gas is evolved at cathode and oxygen gas is evolved at D.

What is 'B'?

A
Oxygen

B
Hydrogen

C
Water

D
Sulphuric acid

Solution

Percentage of oxygen in water

$$\displaystyle = \frac{weight\ of\ oxygen\ in\ water}{weight\ of\ water} \times 100$$

$$\displaystyle = \frac{16}{18} \times 100$$

$$=$$ 88.89%

Thus, water contains 88.89% of oxygen (A)

On decomposition of water we get hydrogen and oxygen.

So, B is hydrogen
Question 10
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Which is true statement about $$H_{2}O$$?

A
Hardness can be removed by passing through ion exchange resin

B
Its pressure can be detected by anhydrous $$CuSO_{4}$$

C
It is amphoprotic

D
All of the above

Solution

Its hardness can be removed by passing through ion exchange resin, its pressure can be detected by anhydrous $$CuSO_4$$.
$$H_2O$$ is amphoprotic as it can be oxidised as well as reduced or it can act as acid as well as base.

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Hydrogen Test - 55

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Hydrogen Test - 55

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SHARING IS CARING

Question 1

It has open cage like structure

It has less density than water

Each O atom is surrounded by 4 H atoms

Each O atom has four H-bonds around it

Solution

Question 2

$$C$$

$$Si$$

$$Ge$$

$$Sn$$

Solution

Question 3

$$-3.8^o\ C$$

$$3.8^o\ C$$

$$0^o\ C$$

$$38^o\ C$$

Solution

Question 4

$$30.35\ g\ L^{-1}$$

$$17\ g\ L^{-1}$$

$$34\ g\ L^{-1}$$

$$68\ g\ L^{-1}$$

Solution

Question 5

It is a colourless and tasteless liquid.

There is no hydrogen bonding in solid state of water.

It is an excellent solvent for transportation of ions in plants and animals.

Frozen water is lighter than liquid water.

Solution

Question 6

Anode

Cathode

Electrolyte

Catalyst

Solution

Question 7

Oxygen

Hydrogen

Water

Sulphuric acid

Solution

Question 8

are dehydrating agents

are formed by transition metals

are very poor reducing agents

are stable towards water and alcohol

Solution

Question 9

Oxygen

Hydrogen

Water

Sulphuric acid

Solution

Question 10

Hardness can be removed by passing through ion exchange resin

Its pressure can be detected by anhydrous $$CuSO_{4}$$

It is amphoprotic

All of the above

Solution

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