# NEET > Hydrogen

Explore popular questions from Hydrogen for NEET. This collection covers Hydrogen previous year NEET questions hand picked by popular teachers.

Physics
Chemistry
Biology

Q 1.

Correct4

Incorrect-1

Which of the following statements about hydrogen is incorrect?

A

Hydronium ion, {tex} \mathrm { H } _ { 3 } \mathrm { O } ^ { + } {/tex} exists freely in solution.

Dihydrogen does not act as a reducing agent.

C

Hydrogen has three isotopes of which tritium is the most common.

D

Hydrogen never acts as cation in ionic salts.

##### Explanation

Q 2.

Correct4

Incorrect-1

Some statements about heavy water are given below:
(i) Heavy water is used as a moderator in nuclear reactors.
(ii) Heavy water is more associated than ordinary water.
(iii) Heavy water is more effective solvent than ordinary water.
Which of the above statements are correct?

(i) and (ii)

B

(i), (ii) and (iii)

C

(ii) and (iii)

D

(i) and (iii)

##### Explanation

Q 3.

Correct4

Incorrect-1

The structure of {tex} \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} is

A

spherical

non-planar

C

planar

D

linear

##### Explanation

Q 4.

Correct4

Incorrect-1

Which one of the following pairs of substances on reaction will not evolve {tex} \mathrm { H } _ { 2 } {/tex} gas?

Copper and HCl (aqueous)

B

Iron and steam

C

Iron and {tex} \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } {/tex} (aqueous)

D

Sodium and ethyl alcohol

##### Explanation

Q 5.

Correct4

Incorrect-1

The volume strength of 1.5{tex} \ \mathrm { N }{/tex} {tex}\mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} solution is

A

8.8

8.4

C

4.8

D

5.2

##### Explanation

Q 6.

Correct4

Incorrect-1

The {tex} \mathrm { O } - \mathrm { O } - \mathrm { H } {/tex} bond angle in {tex} \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} is

A

{tex} 106 ^ { \circ } {/tex}

B

{tex} 109 ^ { \circ } 28 ^ { \prime } {/tex}

C

{tex} 120 ^ { \circ } {/tex}

{tex} 97 ^ { \circ } {/tex}

##### Explanation

Q 7.

Correct4

Incorrect-1

Which of the following groups of ions makes the water hard?

A

Sodium and bicarbonate

Magnesium and chloride

C

Potassium and sulphate

D

Ammonium and chloride.

##### Explanation

Q 8.

Correct4

Incorrect-1

One would expect proton to have very large

A

charge

B

ionization potential

hydration energy

D

radius

##### Explanation

Q 9.

Correct4

Incorrect-1

At its melting point ice is lighter than water because

A

{tex} \mathrm { H } _ { 2 } \mathrm { O } {/tex} molecules are more closely packed in solid state

ice crystals have hollow hexagonal arrangement of {tex} \mathrm { H } _ { 2 } \mathrm { O } {/tex} molecules.

C

on melting of ice the {tex} \mathrm { H } _ { 2 } \mathrm { O } {/tex} molecules shrinks in size

D

ice forms mostly heavy water on first melting.

##### Explanation

Q 10.

Correct4

Incorrect-1

Hydrogen peroxide molecules are

A

monoatomic and form {tex} X _ { 2 } ^ { 2 - } {/tex} ions

diatomic and form {tex} X ^ { - } {/tex} ions

C

diatomic and form {tex} X _ { 2 } ^ { - } {/tex} ions

D

monoatomic and form {tex} X ^ { - } {/tex} ions

##### Explanation

Q 11.

Correct4

Incorrect-1

The ionization of hydrogen atom would give rise to

A

hydride ion

B

hydronium ion

proton

D

hydroxyl ion

##### Explanation

Q 12.

Correct4

Incorrect-1

Which of the following metal evolves hydrogen on reacting with cold dilute {tex} \mathrm { HNO } _ { 3 } ? {/tex}

{tex} \mathrm { Mg } {/tex}

B

{tex}\mathrm { Al} {/tex}

C

{tex}\mathrm { Fe } {/tex}

D

{tex}\mathrm { Cu } {/tex}

##### Explanation

Q 13.

Correct4

Incorrect-1

Which of the following is the true structure of {tex} \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } ? {/tex}

A

C

D

##### Explanation

Q 14.

Correct4

Incorrect-1

The reaction of {tex} \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} with {tex} \mathrm { H } _ { 2 } \mathrm { S } {/tex} is an example of {tex} \ldots \ldots {/tex} reaction.

A

addition

oxidation

C

reduction

D

acidic

##### Explanation

Q 15.

Correct4

Incorrect-1

Which of the following will not displace hydrogen

A

{tex} \mathrm { Ba } {/tex}

B

{tex} Pb {/tex}

{tex} { Hg } {/tex}

D

{tex} { Sn } {/tex}

##### Explanation

Q 16.

Correct4

Incorrect-1

Which of the following statements is correct?

A

Hydrogen has same IP as alkali metals

B

Hydrogen has same electronegativity as halogens

It has oxidation number of {tex} - 1 {/tex} and {tex} + 1 {/tex}

D

It will not be liberated at anode.

##### Explanation

Q 17.

Correct4

Incorrect-1

Which one of the following pairs of substances on reaction will not evolve {tex} \mathrm { H } _ { 2 } {/tex} gas ?

A

Iron and {tex} \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } ( \mathrm { aq } ) {/tex}

B

Iron and steam

Copper and HCl (aq)

D

Sodium and ethanol

##### Explanation

Q 18.

Correct4

Incorrect-1

Following are some properties of hydrogen. Which of the following properties resemble with alkali metals and which with halogens
(i) Hydrogen lose one electron to form unipositive ions (ii) Hydrogen gain one electron to form uninegative ions (iii) Hydrogen forms oxides, halides and sulphides (iv) Hydrogen has a very high ionization enthalpy (v) Hydrogen forms a diatomic molecule, combines with elements to form hydrides and covalent compounds.

A

Alkali metals resemble (i), (iii) and (iv)

B

Alkali metals resemble (i) and (iii) Halogens resemble (ii), (iii) and (v)

Alkali metals resemble (i) and (iii) Halogens resemble (ii), (iv) and (v)

D

Alkali metals resemble (i) only Halogens resemble (iv) and (v)

E

Alkali metals resemble (i) only Halogens resemble (iv) and (v)

##### Explanation

Q 19.

Correct4

Incorrect-1

Match the columns

A

{tex} A - I V ; B - I I ; C - I I I ; D - I {/tex}

{tex} A - I V ; B - I I ; C - I ; D - I I I {/tex}

C

{tex} A - I I I ; B - I I ; C - I V ; D - I {/tex}

D

(d) {tex} A - I ; B - I I ; C - I V ; D - I I I {/tex}

##### Explanation

Q 20.

Correct4

Incorrect-1

The unusual properties of water in the condensed phase (liquid and solid states) are due to the

A

presence of hydrogen and covalent bonding between the water molecules

B

presence of covalent bonding between the water molecules

presence of extensive hydrogen bonding between water molecules

D

presence of ionic bonding

##### Explanation

Q 21.

Correct4

Incorrect-1

Hydrogen bond energy is equal to:

A

{tex} 3 - 7 {/tex} cals

B

{tex} 30 = 70 \mathrm { cals } {/tex}

{tex} 3 - 10 \mathrm { k } {/tex} cals

D

{tex} 30 - 70 \mathrm { k } {/tex} cals

##### Explanation

Q 22.

Correct4

Incorrect-1

{tex} \mathrm { D } _ { 2 } \mathrm { O } {/tex} is preferred to {tex} \mathrm { H } _ { 2 } \mathrm { O } , {/tex} as a moderator, in nuclear reactors because

A

{tex} \mathrm { D } _ { 2 } \mathrm { O } {/tex} slows down fast neutrons better

B

{tex} \mathrm { D } _ { 2 } \mathrm { O } {/tex} has high specific heat

C

{tex} \mathrm { D } _ { 2 } \mathrm { O } {/tex} is cheaper

The neutron absorbing ability of {tex} \mathrm { D } _ { 2 } \mathrm { O } {/tex} is higher

##### Explanation

Q 23.

Correct4

Incorrect-1

Consider the following statements:
1. Atomic hydrogen is obtained by passing hydrogen through an electric arc. 2. Hydrogen gas will not reduce heated aluminium oxide. 3. Finely divided palladium adsorbs large volume of hydrogen gas 4. Pure nascent hydrogen is best obtained by reacting Na with {tex} \mathrm { C } _ { 2 } \mathrm { H } _ { 5 } \mathrm { OH } {/tex}
Which of the above statements is/are correct?

A

only

B

only 2

{tex} 1,2 {/tex} and 3

D

{tex} 2,3 {/tex} and 4

##### Explanation

Q 24.

Correct4

Incorrect-1

The low density of ice compared to water is due to

hydrogen bonding interactions

B

dipole - dipole interactions

C

dipole - induced dipole interactions

D

induced dipole - induced dipole interactions

##### Explanation

Q 25.

Correct4

Incorrect-1

What is formed when calcium carbide reacts with heavy water?

{tex} \mathrm { C } _ { 2 } \mathrm { D } _ { 2 } {/tex}

B

{tex} \mathrm { CaD } _ { 2 } {/tex}

C

{tex} \mathrm { Ca } _ { 2 } \mathrm { D } _ { 2 } \mathrm { O } {/tex}

D

{tex} \mathrm { CD } _ { 2 } {/tex}