Class 10 Chemical Reactions And Equations CBSE Questions & Answers

Class 10 · Chemical Reactions And Equations

This is online test 02 for CBSE class 10 Science Chemical Reactions and Equations.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
What happens when Hydrogen combines with oxygen in the presence of an electric current?
  • A
    \({{\rm{O}}_{\rm{2}}}\) gas is formed
  • B
    \({{\rm{H}}_{\rm{2}}}{\rm{O}}\) is formed
    Correct
  • C
    \({{\rm{H}}_{\rm{2}}}{{\rm{O}}_{\rm{2}}}\) is formed
  • D
    \({{\rm{H}}_{\rm{2}}}\) gas is formed
2
Mg ribbon burns with a dazzling flame in air (oxygen) and changes into a white substance, Magnesium oxide. Magnesium is
  • A
    Oxidized in the reaction
    Correct
  • B
    Neither oxidized nor reduced
  • C
    Reduced in the reaction
  • D
    Both oxidized and reduced simultaneously
3
The reactions in which more reactive element can displace less reactive element from a compound are called
  • A
    Displacement reaction
    Correct
  • B
    Decomposition
  • C
    double displacement reaction
  • D
    combination reaction
4
Decomposition of ferrous sulphate into \({\rm{F}}{{\rm{e}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}},{\rm{ S}}{{\rm{O}}_{\rm{2}}}{\rm{ and S}}{{\rm{O}}_{\rm{3}}}\) occurs in the presence of
  • A
    Light
  • B
    Heat
    Correct
  • C
    All of these
  • D
    catalyst
5
The compound formed by \({\rm{H}}{{\rm{g}}^{ + {\rm{2}}}}{\rm{and C}}{{\rm{l}}^{ - {\rm{ }}}}\) is
  • A
    \({\rm{HgC}}{{\rm{l}}_{\rm{2}}}{\rm{ }}\)
    Correct
  • B
    HgCl
  • C
    \({\rm{H}}{{\rm{g}}_{\rm{2}}}{\rm{C}}{{\rm{l}}_{\rm{2}}}\)
  • D
    \({\rm{H}}{{\rm{g}}_{\rm{2}}}{\rm{Cl }}\)
6
\({{\rm{H}}_{\rm{2}}}{\rm{S}}\) burns in air to give
  • A
    \({{\rm{H}}_{\rm{2}}}{\rm{O and S}}{{\rm{O}}_{\rm{3}}}{\rm{ }}\)
  • B
    \({\rm{C}}{{\rm{O}}_{\rm{2}}}{\rm{ and S}}{{\rm{O}}_{\rm{2}}}\)
  • C
    \({\rm{C}}{{\rm{O}}_{\rm{2}}}{\rm{ and S}}{{\rm{O}}_{{\rm{3 }}}}\)
  • D
    \({{\rm{H}}_{\rm{2}}}{\rm{O and S}}{{\rm{O}}_{{\rm{2 }}}}\)
    Correct
7
\(ZnO{\rm{ + C }} \to {\rm{ Zn + CO}}\) is an example of
  • A
    Both oxidation and reduction simultaneously
    Correct
  • B
    Neither oxidation nor reduction
  • C
    oxidation Reaction
  • D
    Reduction reaction
8
Find the incorrect statement : (I) oxygen is highly combustible and hydrogen is supporter of combustion, (II) Oxygen and hydrogen both are highly combustible, (III) Oxygen and hydrogen both are supporters of combustion, (IV) Hydrogen is highly combustible and oxygen is supporter of combustion
  • A
    IV, I and II
  • B
    I, II and IV
  • C
    I, II and III
    Correct
  • D
    I, III and IV
9
The following complete the equation \({\rm{2HC}}{{\rm{l}}_{({\rm{aq}})}} + {\rm{ N}}{{\rm{a}}_{\rm{2}}}{\rm{ C}}{{\rm{O}}_{{\rm{3}}({\rm{s}})}}{\rm{ }} \to {\rm{2NaC}}{{\rm{l}}_{({\rm{aq}})}}{\rm{ }} + {\rm{ C}}{{\rm{O}}_{{\rm{2}}\left( {\rm{g}} \right){\rm{ }}}} + \ldots \ldots \ldots \ldots \ldots \ldots \)
  • A
    NaOH
  • B
    \({{\rm{H}}_{\rm{2}}}{\rm{O}}\)
    Correct
  • C
    \({\rm{N}}{{\rm{a}}_{\rm{2}}}{\rm{C}}{{\rm{O}}_{\rm{3}}}\)
  • D
    \({{\rm{H}}_{\rm{2}}}{\rm{C}}{{\rm{O}}_{\rm{3}}}\)
10
Which of the following forms a coloured solution in water ?
  • A
    \({\rm{A}}{{\rm{l}}_{\rm{2}}}{\left( {{\rm{S}}{{\rm{O}}_{\rm{4}}}} \right)_{\rm{3}}}\)
  • B
    \({\rm{CuS}}{{\rm{o}}_{\rm{4}}}\)
    Correct
  • C
    \({\rm{N}}{{\rm{a}}_{\rm{2}}}{\rm{S}}{{\rm{O}}_{{\rm{4 }}}}\)
  • D
    \({\rm{ZnS}}{{\rm{O}}_{\rm{4}}}\)
11
Which of the following decolourizes a blue solution of copper sulphate?
  • A
    Al
  • B
    All of these
    Correct
  • C
    Zn
  • D
    Fe
12
What will be the correct order if the given elements are arranged according to the increasing order of reactivity? Fe, Zn, Pt, Cu, H, Au
  • A
    Fe, Zn, H, Cu, Pt, Au
  • B
    H, Cu, Au, Pt, Zn, Fe
  • C
    Zn, Fe, H, Cu, Pt, Au
    Correct
  • D
    Au, Pt, Cu, H, Fe, Zn
13
Which one of Fe, Al, Cu, Zn is the least reactive metal?
  • A
    Zn
  • B
    Fe
  • C
    Al
  • D
    Cu
    Correct
14
The volume of gas collected in one of the test tubes in electrolysis of water is double than other name the gas
  • A
    Hydrogen
    Correct
  • B
    none of these
  • C
    oxygen
  • D
    Nitrogen
15
Milk becomes sour if kept for a long time because of
  • A
    Rusting
  • B
    Rancidity
    Correct
  • C
    All of these
  • D
    corrosion