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
In the process of obtaining pure de-mineralised water is passed initially through cation exchange , This makes the water
  • A
    acidic
    Correct
  • B
    neutral
  • C
    remain unchanged
  • D
    basic
2
Pure de-mineralised water is obtained by passing water through an anion exchange as a second process after passing it through a cation exchange. This makes the water
  • A
    basic
  • B
    remain unchanged
  • C
    acidic
  • D
    neutral
    Correct
3
Hydrogen resembles halogens in many respects for which several factors are responsible. Of the following factors which one is most important in this respect?
  • A
    Its tendency to gain a single electron in its valence shell to attain stable electronic configuration.
    Correct
  • B
    Its tendency to lose an electron to form a cation.
  • C
    Its small size.
  • D
    Its low negative electron gain enthalpy value.
4
Why does H+ ion always get associated with other atoms or molecules?
  • A
    Loss of an electron from hydrogen atom results in a nucleus of very small size as compared to other atoms or ions. Due to small size it cannot exist free
    Correct
  • B
    It resembles both alkali metals and halogens.
  • C
    Ionisation enthalpy of hydrogen resembles that of alkali metals.
  • D
    Its reactivity is similar to halogens.
5
Metal hydrides are ionic, covalent or molecular in nature. Among LiH, NaH, KH, RbH, CsH, the correct order of increasing ionic character is
  • A
    RbH > CsH > NaH > KH > LiH
  • B
    LiH > NaH > CsH > KH>RbH
  • C
    NaH > CsH > RbH > LiH > KH
  • D
    LiH < NaH < KH < RbH < CsH
    Correct
6
Temporary hardness It can be removed in boiling by precipitating
  • A
    \({\text{CaC}}{{\text{O}}_{\text{3}}}.{\text{Mg}}{\left( {{\text{OH}}} \right)_{\text{2}}}\)
    Correct
  • B
    \({\text{Mg}}{\left( {{\text{HC}}{{\text{O}}_{\text{3}}}} \right)_{\text{2}}}{\text{Ca}}{\left( {{\text{HC}}{{\text{O}}_{\text{3}}}} \right)_{\text{2}}}\)
  • C
    \({\text{Ca}}{\left( {{\text{HC}}{{\text{O}}_{\text{3}}}} \right)_{\text{2}}}.{\text{Mg}}{\left( {{\text{OH}}} \right)_{\text{2}}}\)
  • D
    \({\text{Mg}}{\left( {{\text{HC}}{{\text{O}}_{\text{3}}}} \right)_{\text{2}}}.{\text{CaC}}{{\text{O}}_{\text{3}}}\)
7
In Calgon’s method, one of the following chemical is used to remove hardness of water
  • A
    sodium hexametaphosphate
    Correct
  • B
    sodium carbonate
  • C
    sodium hydroxide
  • D
    sodium chloride
8
Which of the following hydrides is electron-precise hydride?
  • A
    \({\text{N}}{{\text{H}}_{\text{3}}}\)
  • B
    \({{\text{H}}_{\text{2}}}{\text{O}}\)
  • C
    \({{\text{B}}_{\text{2}}}{{\text{H}}_{\text{6}}}\)
  • D
    \({\text{C}}{{\text{H}}_{\text{4}}}\)
    Correct
9
The three isotopes of hydrogen in terms of chemical properties show one of the following properties
  • A
    difference is in their rates of reactions
    Correct
  • B
    same rates of reactions because of the same electronic configuration
  • C
    same rates of reactions because of the same enthalpy of bond dissociation
  • D
    same rates of reactions because of the same mass
10
Consider the reactions (A) \({{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}} + {\text{ 2HI }} \to {\text{ }}{{\text{I}}_{\text{2}}} + {\text{ 2}}{{\text{H}}_{\text{2}}}{\text{O }}\left( {\text{B}} \right){\text{ HOCl }} + {\text{ }}{{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}} \to {\text{ }}{{\text{H}}_{\text{3}}}{\text{O}} + {\text{ Cl}}--{\text{ }} + {\text{ }}{{\text{O}}_{\text{2}}}\) Which of the following statements is correct about H2O2 with reference to these reactions? Hydrogen perioxide is ________.
  • A
    a reducing agent in (A) and oxidising agent in (B)
  • B
    a reducing agent in both (A) and (B)
  • C
    an oxidising agent in (A) and reducing agent in (B)
    Correct
  • D
    an oxidising agent in both (A) and (B)
11
The oxide that gives H2O2 on treatment with dilute \({\text{H2SO4 is }}---\)
  • A
    TiO2
  • B
    PbO2
  • C
    \({\text{BaO2 }}.{\text{8}}{{\text{H}}_{\text{2}}}{\text{O}} + {\text{ O 2}}\)
    Correct
  • D
    MnO2
12
Calculate the strength of 5 volume \({{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}}\) solution.
  • A
    \({\text{2}}.{\text{5}}\% \) solution
  • B
    10 g/L solution
  • C
    \({\text{3}}.{\text{5}}\% \) solution
  • D
    15 g/L solution
    Correct
13
Hydrogenation of vegetable oil using nickel as catalyst gives edible fats. Choose the appropriate one given below.
  • A
    sunflower oil
  • B
    vanaspati
    Correct
  • C
    Cheese
  • D
    Rice bran oil
14
Syngas is mixture of
  • A
    carbon tetrachloride and dihyrogen
  • B
    carbondioxide and hydronium ion
  • C
    carbon monooxide and dihyrogen
    Correct
  • D
    carbon dioxide and dihyrogen
15
Reaction of carbon monoxide gas of syngas mixture with steam in the presence of catalyst is called
  • A
    coal gasification reaction
  • B
    Hydrolysis Reaction:
  • C
    Redox Reactions
  • D
    water-gas shift reaction
    Correct