Class 11 Chemistry Chapter 9 Hydrogen

This set of Class 11 Chemistry Chapter 9 Multiple Choice Questions & Answers (MCQs) focuses on “Hydrogen”. These MCQs are created based on the latest CBSE syllabus and the NCERT curriculum, offering valuable assistance for exam preparation.

1. The element that is known as Rogue element is ________
a) beryllium
b) hydrogen
c) helium
d) lithium
View Answer

Answer: b
Explanation: Hydrogen resembles with alkali metals as well as halogens at the same time it differs from both and certain characteristics, that is why hydrogen is called a Rogue Element. Finally, it’s been placed in the first group.

2. Which of the following element is an alkali as well as halogen?
a) hydrogen
b) sodium
c) chlorine
d) magnesium
View Answer

Answer: a
Explanation: Hydrogen is an alkali metal as well as a halogen because of its outer shell configuration as well as its high electronegative character, no other element has a type of duel characteristic in the periodic table.

3. Which of the following is hydrogen’s electronic configuration?
a) 1s¹
b) 1s²
c) 2s¹
d) 2s²
View Answer

Answer: a
Explanation: The electronic configuration of hydrogen is 1s¹, as it has only one Proton. It belongs to the first group and is ready to gain one electron in order to become a noble gas like helium which is next to it.

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4. The atomic number of hydrogen is 1.
a) true
b) false
View Answer

Answer: a
Explanation: Atomic number of an element represents the number of protons in that particular element. Here as hydrogen has only one Proton, its atomic number is considered to be one, so the above statement is true.

5. Hydrogen is a ___________________
a) metal
b) metalloid
c) non-metal
d) solid
View Answer

Answer: c
Explanation: Hydrogen is a nonmetal denoted by the symbol “H”, but it is placed in the first group, which consists of metals. This is because of the outer shell configuration of hydrogen and that it’s valency is 1. It’s highly electronegative in nature.

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6. Hydrogen is the 1st element. The elements in the periodic table are arranged with respect to their __________
a) atomic numbers
b) molecular weights
c) atmospheric abundance
d) physical state
View Answer

Answer: a
Explanation: We all know that the elements in the periodic table are arranged according to their atomic numbers and atomic numbers are nothing but the number of protons in that element. So hydrogen takes the first place.

7. Hydrogen has _____________ ionization enthalpy.
a) high
b) low
c) zero
d) no
View Answer

Answer: a
Explanation: Though hydrogen is placed in the first group which is of alkali metals, it has a very high ionization enthalpy this is because it has a characteristic of a halogen as well. We can say that hydrogen is an alkali metal and a halogen at a time.

8. The property of hydrogen of forming diatomic molecule is from ______________
a) halogen
b) alkali metal
c) noble gas
d) d-block
View Answer

Answer: a
Explanation: As we know that hydrogen is an alkali metal as well as a halogen. It has properties of both alkali metals and halogens, the property of formation of a diatomic molecule is from halogens, but not from alkali metals.

9. H⁺ Ion exist freely.
a) true
b) false
View Answer

Answer: b
Explanation: The loss of electrons from hydrogen atom results in the hydrogen nucleus that is H⁺ of the size 1.5 x 10^-3 pm and it is extremely small when compared to a normal at atomic and ionic sizes that are around 50 to 200 pm.

10. Reactivity of hydrogen is ______________ compared to halogens.
a) high
b) low
c) zero
d) negative
View Answer

Answer: b
Explanation: Though hydrogen has many properties of halogens, in terms of reactivity it shows very low similarity when compared to halogens. This is one of the reasons, it’s probably not placed in halogens, but in alkali metals.

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