Hydrogen Test

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Hydrogen Test - 50

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Weekly Quiz Competition

Question 1
1 / -0

An orange coloured solution acidified with $$H_2SO_4$$ and treated with a substance $$'X'$$ gives a blue coloured solution of $$CrO_5$$. The substance $$'X'$$ is:

A
$$H_2O$$

B
$$dil. HCl$$

C
$$H_2O_2$$

D
$$conc. HCl$$

Solution

The orange colour solution will be $$K_2Cr_2O_7$$

$$K_2Cr_2O_7+H_2SO_4\rightarrow K_2SO_4 + H_2Cr_2O_7$$

$$H_2Cr_2O_7+4H_2O_2\rightarrow 2CrO_5+5H_2O$$
_____________________________________________________
$$K_2Cr_2O_7+H_2SO_4+4H_2O_2\rightarrow K_2SO_4 +2CrO_5+5H_2O $$
_____________________________________________________

$$\mathbf{Hence\ the\ correct\ answer\ is\ option\ (C)}$$
Question 2
1 / -0

Hydrogen peroxide was for the first time prepared by:

A
Priestley

B
Thenard

C
Gay- Lussac

D
Bernard

Solution
Question 3
1 / -0

Water is oxidised to oxygen by:

A
Ozone

B
$$KMnO_4$$

C
$$H_2O_2$$

D
$$F_2$$

E
$$ClO_2$$

Solution
Question 4
1 / -0

In which of the following reactions does water act as an oxidising agent?

A
$$3F_2 +3H_2O \longrightarrow 6HF+O_3$$

B
$$CaC_2 +2H_2O \longrightarrow Ca(OH)_2+C_2 H_2$$

C
$$C+H_2O \longrightarrow CO+H_2$$

D
$$AIN +3H_2O\longrightarrow Al(OH)_3+NH_3$$

Solution
Question 5
1 / -0

Which is not linear?

A
$$CO_2$$

B
$$HCN$$

C
$$C_2H_2$$

D
$$H_2O$$

Solution

Carbon dioxide has a linear molecular geometry given that it's bond angle is 180 degree between both carbon and the two oxygen atoms. The carbon atom has an sp hybridization and the two oxygen atoms both have an sp2 hybridization.

Hydrogen cyanide, is linear molecule with a triple bond between C and N atom and has bond angle of 180 degree

Acetylene contains two carbon atoms bonded together in a triple bond. The carbon–carbon triple bond places all four atoms in the same straight line, with CCH bond angles of 180 degree.

A water molecule consists of two hydrogen atoms and one oxygen atom having lone pair of electrons. The three atoms make an angle; the H-O-H angle is approximately 104.5 degrees due to lone pair-lone pair (lp-lp) repulsion on oxygen atoms which is stronger than lone pair- bond pair(lp-bp) and bond pair-bond pair (bp-bp) repulsion.
The correct answer is [D].
Question 6
1 / -0

For pure water at an unknown temperature, the $$pH$$ should always be equal to

A
$$7$$

B
$$ > 7$$

C
$$ < 7$$

D
$$any\ of\ them$$

Solution

pH of water can take an value because it is different at different temperatures.
Hence, Option "D" is the correct answer.
Question 7
1 / -0

When steam reacts with red hot coke to form $$CO_2$$ and hydrogen:

A
water acts as oxidising agent

B
water acts as reducing agent

C
carbon acts as oxidising agent

D
there is no oxidising or reduction

Solution
Question 8
1 / -0

Phosphorous is kept in:

A
kerosene

B
alcohol

C
water

D
ammonia

Solution

Phosphorus is a very reactive metal, when exposed to air it starts reacting vigorously, therefore it is kept in water.
Hence the correct option is (C).
Question 9
1 / -0

Assertion: $$H_{2}O$$ is the only hydride of the chalcogens which is liquid.
Reasons:In ice, each $$O$$ atom is surrounded by $$4H$$ atoms.

A
Both A and R are correct and R is the correct explanation of A

B
Both A and R are correct but R is not the correct explanation of A

C
A is not correct but R is correct

D
both A and R are not correct

Solution
Question 10
1 / -0

The photolysis of water gives the substance

A
$$OH^- + H^+$$

B
$$H_2 + OH^-$$

C
$$H_2 + O_2$$

D
$$H_2O + H_2O_2$$

Solution

$$H_2O \xrightarrow[]{\text{Photolysis}} OH^- + H^+$$
Option A is correct.

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Re-Attempt Weekly Quiz Competition

Hydrogen Test - 50

Result

Hydrogen Test - 50

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SHARING IS CARING

Question 1

$$H_2O$$

$$dil. HCl$$

$$H_2O_2$$

$$conc. HCl$$

Solution

Question 2

Priestley

Thenard

Gay- Lussac

Bernard

Solution

Question 3

Ozone

$$KMnO_4$$

$$H_2O_2$$

$$F_2$$

$$ClO_2$$

Solution

Question 4

$$3F_2 +3H_2O \longrightarrow 6HF+O_3$$

$$CaC_2 +2H_2O \longrightarrow Ca(OH)_2+C_2 H_2$$

$$C+H_2O \longrightarrow CO+H_2$$

$$AIN +3H_2O\longrightarrow Al(OH)_3+NH_3$$

Solution

Question 5

$$CO_2$$

$$HCN$$

$$C_2H_2$$

$$H_2O$$

Solution

Question 6

$$7$$

$$ > 7$$

$$ < 7$$

$$any\ of\ them$$

Solution

Question 7

water acts as oxidising agent

water acts as reducing agent

carbon acts as oxidising agent

there is no oxidising or reduction

Solution

Question 8

kerosene

alcohol

water

ammonia

Solution

Question 9

Both A and R are correct and R is the correct explanation of A

Both A and R are correct but R is not the correct explanation of A

A is not correct but R is correct

both A and R are not correct

Solution

Question 10

$$OH^- + H^+$$

$$H_2 + OH^-$$

$$H_2 + O_2$$

$$H_2O + H_2O_2$$

Solution

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