# NEET

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

## Biology

Hydrogen

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Q 1. Which of the following statements about hydrogen is incorrect?

A

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

B

Dihydrogen does acts as a reducing agent.

C

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

Hydrogen never acts as cation in ionic salts.

##### Explanation

Hydrogen acts as cation in ionic salts. Hydrogen has 3 isotopes namely protium, deuterium and tritium containing one proton each and one, two and three neutrons respectively. out of them protium is the most common isotope(99.98% abundance).

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Q 2. 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

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Q 3. The structure of {tex} \mathrm { H } _ { 2 } \mathrm { O } _ { 2 } {/tex} is

A

spherical

non-planar

C

planar

D

linear

##### Explanation

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Q 4. 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

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Q 5. 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

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Q 6. 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

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Q 7. One would expect proton to have very large

A

charge

B

ionization potential

hydration energy

D

##### Explanation

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Q 8. 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

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Q 9. Hydrogen peroxide molecules are

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

B

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

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Q 10. 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

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Q 11. 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

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Q 12. 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

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Q 13. 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 {tex} \mathrm { H Cl } {/tex} (aq)

D

Sodium and ethanol

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Q 14. 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 uni positive ions
(ii) Hydrogen gain one electron to form uni negative 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)

##### Explanation

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Q 15. 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}

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Q 16. 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

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Q 17. {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

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Q 18. 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.
4. Pure nascent hydrogen is best obtained by reacting {tex} \mathrm { Na } {/tex} with {tex} \mathrm { C } _ { 2 } \mathrm { H } _ { 5 } \mathrm { OH } {/tex}
Which of the above statements is/are correct?

A

{tex} 1{/tex} only

B

only {tex} 2{/tex}

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

D

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

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Q 19. 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

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Q 20. 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}