Hydrogen Test

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Hydrogen Test - 34

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Weekly Quiz Competition

Question 1
1 / -0

Complete the following equation$$:$$
$$Cl_2+H_2O\rightarrow$$

A
$$HCl+HClO$$

B
$$HCl+O_2$$

C
$$HClO+O_2$$

D
None of the above

Solution

$$Cl_2+H_2O\rightarrow HCl+HClO$$
Question 2
1 / -0

Which of the following metal reacts with steam to liberate hydrogen?

A
Magnesium

B
Aluminium

C
Zinc

D
All of the above

Solution

Less reactive metals such as Magnesium, aluminum, zinc and iron react with steam to liberate hydrogen.
Question 3
1 / -0

________ does not expand on melting and does not contract on freezing.

A
Alcohol

B
Helium

C
Water

D
Oxygen

Solution

In melting process, ice changes to water and in freezing, water changes to ice. Both occur at 0$$ ^{\circ}C $$ only. Only change of state occurs here and not volume.
Question 4
1 / -0

Steam reacts with red hot iron to produce?

A
Ferric oxide and hydrogen

B
Ferric oxide and hydrogen gas

C
Ferrous oxide and hydrogen

D
Ferrous oxide and hydrogen gas

Solution

Steam reacts with red hot iron to produce ferric oxide and hydrogen.
Question 5
1 / -0

Oxygen is collected by downward displacement of water since it weighs __________ as/than air.

A
heavier

B
lighter

C
same

D
none of the above

Solution

The weight of oxygen is almost same as that of air.
Question 6
1 / -0

Which of the following reaction is correct when water reacts with metal?

A
$$2K+2H_2O\rightarrow 2KOH+H_2\uparrow$$

B
$$2Na+2H_2O\rightarrow 2NaOH+H_2\uparrow$$

C
$$Ca+2H_2O\rightarrow Ca(OH)_2+H_2\uparrow$$

D
All of the above

Solution

Potassium reacts vigorously with cold water to form potassium hydroxide and hydrogen gas. With Sodium cold water form sodium hydroxide and hydrogen gas. When cold water reacts with calcium, produce milky turbid solution called Calcium hydroxide and $$H_2$$.
Question 7
1 / -0

Aluminium carbide reacts with water to give __________.

A
Ethane gas

B
Methane gas

C
Acetylene gas

D
Ethyne gas

Solution

Aluminium carbide reacts with water gives methane gas.
Question 8
1 / -0

It is difficult to cook rice in an open vessel by boiling it at high altitudes because of:

A
low boiling point and high pressure

B
high boiling point and low pressure

C
low boiling point and low pressure

D
high boiling point and high pressure

Solution

At high altitude pressure is low and therefore the boiling point is also low. In this case, water starts boiling below its boiling point but rice cooks at $$100$$. So, it is difficult to cook rice at high altitudes.
Question 9
1 / -0

Which of the following is not correct regrading the electrolytic preparation of $$H_2O_2$$?

A
Lead is used as cathode

B
$$50\%$$ $$H_2SO_4$$ is used

C
Hydrogen is liberated at anode

D
Sulphuric acid undergoes oxidation.

Solution

$$H_2O_2$$ can be prepared by electrolysis of 50% $$H_2SO_4$$.
Here hydrogen is liberated at cathode
$${ H }_{ 2 }{ SO }_{ 4 }\rightleftharpoons 2{ H }^{ + }+{ S{ O }_{ 4 } }^{ 2- }$$

At anode:
$$2{ HS{ O }_{ 4 } }^{ - }\rightleftharpoons H_2S_2O_8+2e^-$$
$$H_2S_2O_8+H_2O\longrightarrow 2H_2SO_4+H_2O_2$$

At cathode:
$$2H^++2e^-\longrightarrow H_2$$
Question 10
1 / -0

Statement 1: Water is a polar substance.
Statement 2: The sharing of the bonding electrons in water is unequal.

A
Both statement 1 and statement 2 are correct and statement 2 is the correct explanation of statement 1

B
Both statement 1 and statement 2 are correct and statement 2 is not the correct explanation of statement 1

C
Statement 1 is correct but statement 2 is not correct

D
Statement 1 is not correct but statement 2 is correct

E
Both the statement 1 and statement 2 are not correct

Solution

Since O is more electronegative than H, the bond pair of electrons are more towards O than towards H. The O-H bond is polar covalent bond.
So both the statements are correct and statement 2 is the correct explanation of statement 1.

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Hydrogen Test - 34

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Hydrogen Test - 34

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Question 1

$$HCl+HClO$$

$$HCl+O_2$$

$$HClO+O_2$$

None of the above

Solution

Question 2

Magnesium

Aluminium

Zinc

All of the above

Solution

Question 3

Alcohol

Helium

Water

Oxygen

Solution

Question 4

Ferric oxide and hydrogen

Ferric oxide and hydrogen gas

Ferrous oxide and hydrogen

Ferrous oxide and hydrogen gas

Solution

Question 5

heavier

lighter

same

none of the above

Solution

Question 6

$$2K+2H_2O\rightarrow 2KOH+H_2\uparrow$$

$$2Na+2H_2O\rightarrow 2NaOH+H_2\uparrow$$

$$Ca+2H_2O\rightarrow Ca(OH)_2+H_2\uparrow$$

All of the above

Solution

Question 7

Ethane gas

Methane gas

Acetylene gas

Ethyne gas

Solution

Question 8

low boiling point and high pressure

high boiling point and low pressure

low boiling point and low pressure

high boiling point and high pressure

Solution

Question 9

Lead is used as cathode

$$50\%$$ $$H_2SO_4$$ is used

Hydrogen is liberated at anode

Sulphuric acid undergoes oxidation.

Solution

Question 10

Both statement 1 and statement 2 are correct and statement 2 is the correct explanation of statement 1

Both statement 1 and statement 2 are correct and statement 2 is not the correct explanation of statement 1

Statement 1 is correct but statement 2 is not correct

Statement 1 is not correct but statement 2 is correct

Both the statement 1 and statement 2 are not correct

Solution

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