Hydrogen

NEET Chemistry · 90 questions · Page 3 of 9 · Click an option or "Show Solution" to reveal answer

Q21

The temporary hardness of water is due to :

A Na2SO4

B NaCl

C Ca(HCO3)2

D CaCl2

Correct Answer

Option C

Solution

Ca(HCO3)2 is responsible for temporary hardness of water.

Q22

The one that is NOT suitable for the removal of permanent hardness of water is :

A Ion-exchange method

B Calgon's method

C Treatment with sodium carbonate

D Clark's method

Correct Answer

Option D

Solution

For Removal of Temporary hardness two methods are present (1) Clark’s method (2) Boiling While permanent hardness of water can be removed 4 methods (1) Washong soda method (Na2CO3 method), (2) Calgon method (3) Permutit Process (4) Ion-exchange Resin method.

Q23

Dihydrogen of high purity (> 99.95%) is obtained through :

A the electrolysis of acidified water using Pt electrodes

B the electrolysis of warm Ba(OH)2 solution using Ni electrodes

C the electrolysis of brine solution

D the reaction of Zn with dilute HCl

Correct Answer

Option B

Solution

To obtain H2 of high purity (> 99.95 %) electrolysis of Ba(OH)2 solution is done using Ni electrodes.

Q24

Hydrogen peroxide, in the pure state, is :

A Linear and blue in color

B Linear and almost colorless

C Non-planar and almost colorless

D Planar and bluein color

Correct Answer

Option C

Solution

Hydrogen peroxide, in the pure state, has openbook like structure which is non- planar and almost colourless (very pale blue) liquid.

Q25

Amongst the following, the form of water with the lowest ionic conductance at 298 K is :

A saline water used for intravenous injection

B sea water

C distilled water

D water from a well

Correct Answer

Option C

Solution

The form of H2O with the lowest ionic conductance at 298 K is distilled water.

Q26

Among the statements (a) - (d), the correct ones are : (a) Decomposition of hydrogen peroxide gives dioxygen. (b) Like hydrogen peroxide, compounds, such as KCIO3, Pb(NO3)2 and NaNO3 when heated liberate dioxygen. (c) 2-Ethylanthraquinone is useful for the industrial preparation of hydrogen peroxide. (d) Hydrogen peroxide is used for the manufacture of sodium perborate.

A (a), (b), (c) and (d)

B (a) and (c) only

C (a), (b) and (c) only

D (a), (c) and (d) only

Correct Answer

Option A

Solution

H2O2

\overset{\Delta}\longrightarrow

2H2O +O2 KClO3, Pb(NO3)2, NaNO3 on heating will release O2 gas. 2H3BO3 + 2NaOH + 2H2O2 $\to$ Na2[B2(O2)(OH)4] + 4H2O

Q27

In comparison to the zeolite process for the removal of permanent hardness, the synthetic resins method is :

A less efficient as the resins cannot be regenerated.

B more efficient as it can exchange only cations.

C more efficient as it can exchange both cations as well as anions.

D less efficient as it exchanges only anions.

Correct Answer

Option C

Solution

Synthetic resin method is more efficient because it can exchange both cation & anion.

Q28

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Hydrogen is the most abundant element in the Universe, but it is not the most abundant gas in the troposphere. Reason R : Hydrogen is the lightest element. In the light of the above statements, choose the correct answer from the options given below :

A Both A and R are true but R is NOT the correct explanation of A

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

C A is true but R is false

D A is false but R is true.

Correct Answer

Option B

Solution

As we know, hydrogen is most abundant element in the universe but the most abundant gas in the troposphere is nitrogen, because hydrogen is lightest element.

Troposphere contains 3 quarters of mass of the entire atmosphere.

The air here contain 78% nitrogen and 21% oxygen.

The last 1% is made of argon, water vapour and carbon dioxide.

Q29

The number of neutrons and electrons, respectively, present in the radioactive isotope of hydrogen is :

A 1 and 1

B 3 and 1

C 2 and 1

D 2 and 2

Correct Answer

Option C

Solution

Radioactive isotope of hydrogen is Tritium (

_1^3

T) No. of neutrons (A $-$ Z) = 3 $-$ 1 = 2 No. of electrons = 1

Q30

Hydrogen peroxide reacts with iodine in basic medium to give :

A IO

_4^ -

B IO

-

C I

-

D IO

_3^ -

Correct Answer

Option C

Solution

I2 + H2O2 + 2OH $-$ $\to$ 2I $-$ + 2H2O + O2

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