Hydrogen CBSE Questions & Answers

Hydrogen

This is Chemistry Class 11 Hydrogen CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Hydrogen has the simplest atomic structure among all the elements around us in Nature. Its electronic configuration is
  • A
    \({\text{1}}{{\text{s}}^{\text{1}}}{\text{2}}{{\text{s}}^{\text{1}}}\)
  • B
    \({\text{1}}{{\text{s}}^{\text{1}}}\)
    Correct
  • C
    \({\text{2}}{{\text{s}}^{\text{1}}}\)
  • D
    \({\text{1}}{{\text{s}}^{\text{2}}}\)
2
Hydrogen is the first element in the periodic table and has resemblance to alkali metals as well as with halogens. However, its placement in the periodic table has been a subject of discussion in the past. Currently hydrogen is placed in which group?
  • A
    17
  • B
    4
  • C
    separate group
    Correct
  • D
    1
3
Hydrogen is unique in behaviour because of its
  • A
    extremely small atomic size
    Correct
  • B
    nonmetallic characteristic
  • C
    low reactivity
  • D
    high ionization enthalpy
4
Hydrogen has three isotopes: protium, deuterium, and tritium. Which of them is radioactive and emits beta particles ?
  • A
    protium under certain conditions
  • B
    protium
  • C
    deuterium
  • D
    tritium
    Correct
5
The three isotopes of hydrogen in terms of chemical properties show one of the following properties
  • A
    same rates of reactions because of the same enthalpy of bond dissociation
  • B
    same rates of reactions because of the same mass
  • C
    difference is in their rates of reactions
    Correct
  • D
    same rates of reactions because of the same electronic configuration
6
The giant planets Jupiter and Saturn consist mostly of
  • A
    oxygen
  • B
    hydrogen
    Correct
  • C
    carbondioxide
  • D
    nitrogen
7
In the earth’s atmosphere, hydrogen exists in the form of
  • A
    In the combined form with other elements and compounds
    Correct
  • B
    protium
  • C
    deuterium
  • D
    tritium
8
Heavy hydrogen is also called
  • A
    protium
  • B
    tritium
  • C
    dihydrogen
  • D
    deuterium
    Correct
9
For the synthesis of methanol and a number of hydrocarbons , the compounds used are
  • A
    mixture of CO and \({{\text{H}}_{\text{2}}}\)
    Correct
  • B
    mixture of \({\text{C}}{{\text{O}}_{\text{2}}}\) and \({{\text{H}}_{\text{2}}}\)
  • C
    mixture of C and \({{\text{H}}_{\text{2}}}\)
  • D
    mixture of C, Zn and \({{\text{H}}_{\text{2}}}\)
10
Dioxygen reacts with dioxygen to form water. The reaction is.
  • A
    highly exothermic
    Correct
  • B
    slightly endothermic
  • C
    highly endothermic
  • D
    occurs at room temperature
11
Dihydrogen is used in fuel cells for generating electrical energy because
  • A
    the surface tension is low
  • B
    does not produce any pollution
    Correct
  • C
    releases lesser energy per unit mass of fuel
  • D
    is rather unreactive at moderate temperatures
12
Dihydrogen under certain reaction conditions, combines with almost all elements to form binary compounds, called hydrides except with few which are given below Choose one of the options
  • A
    noble gases,
    Correct
  • B
    transition elements
  • C
    alkali metals
  • D
    p-block elements
13
hydrogen compounds of non-metals are volatile compounds because
  • A
    they are ionic
  • B
    they are covalent
    Correct
  • C
    they are non-stoichiometric hydrides
  • D
    they are salt-like hydrides
14
Most of the s-block elements form dihydrogen compounds which are:
  • A
    highly electropositive
    Correct
  • B
    highly electronegative
  • C
    covalent
  • D
    neutral
15
The ionic hydrides are crystalline, non-volatile but on melting does one of the following:
  • A
    liberates dihydrogen gas at cathode
  • B
    liberates lithium at anode
  • C
    conducts electricity
    Correct
  • D
    liberate water