Class 10 Chemical Reactions And Equations CBSE Questions & Answers

Class 10 · Chemical Reactions And Equations

This is online test 01 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
Which two gases are released on heating lead nitrate?
  • A
    \({\rm{S}}{{\rm{O}}_{\rm{2}}},{{\rm{O}}_{{\rm{2 }}}}\)
  • B
    \({\rm{NO}},{{\rm{O}}_{\rm{2}}}\)
  • C
    \({{\rm{N}}_{\rm{2}}}{\rm{O}},{{\rm{O}}_{\rm{2}}}{\rm{ }}\)
  • D
    \({\rm{N}}{{\rm{O}}_{\rm{2}}},{{\rm{O}}_{\rm{2}}}\)
    Correct
2
Some crystals of copper sulphate were dissolved in water. The colour of the solution obtained would be
  • A
    brown
  • B
    green
  • C
    red
  • D
    blue
    Correct
3
The colour of zinc metal is
  • A
    silvery
  • B
    Red dish brown
  • C
    white
  • D
    Grey
    Correct
4
Which one of the following will be required to identify the gas evolved when diluted HCl reacts with zinc metal?
  • A
    Red litmus solution
  • B
    A burning splinter
    Correct
  • C
    Blue litmus solution
  • D
    Lime water
5
Which of the following is not a balanced chemical equation?
  • A
    \({\rm{Ca}}{\left( {{\rm{OH}}} \right)_{\rm{2}}}\left( {\rm{l}} \right) + {\rm{C}}{{\rm{O}}_{\rm{2}}}\left( {\rm{g}} \right){\rm{CaCO}}\left( {\rm{s}} \right) + {{\rm{H}}_{\rm{2}}}{\rm{O}}\left( {\rm{l}} \right)\)
  • B
    \({\rm{Fe}}\left( {\rm{s}} \right) + {\rm{C}}{{\rm{l}}_{\rm{2}}}\left( {\rm{g}} \right){\rm{FeC}}{{\rm{l}}_{\rm{2}}}\left( {\rm{s}} \right)\)
    Correct
  • C
    \({\rm{Mg}}\left( {\rm{s}} \right) + {\rm{CuS}}{{\rm{O}}_{\rm{4}}}\left( {{\rm{aq}}} \right){\rm{MgS}}{{\rm{O}}_{\rm{4}}}\left( {{\rm{aq}}} \right) + {\rm{Cu }}\left( {\rm{s}} \right)\)
  • D
    \({\rm{Zn}}\left( {\rm{s}} \right) + {{\rm{H}}_{\rm{2}}}{\rm{S}}{{\rm{O}}_{\rm{4}}}\left( {{\rm{aq}}} \right){\rm{ZnS}}{{\rm{O}}_{\rm{4}}}\left( {{\rm{aq}}} \right) + {{\rm{H}}_{\rm{2}}}\left( {\rm{g}} \right)\)
6
Can we store \({\rm{CuS}}{{\rm{O}}_{\rm{4}}}\) in iron container and why?
  • A
    No, because Cu is some reactive than iron
  • B
    No, because iron is more reactive than copper, therefore, reaction will take place
    Correct
  • C
    Yes, because copper is less reactive than iron
  • D
    Yes, because copper is more reactive than iron.
7
The odour of \({\rm{S}}{{\rm{O}}_{\rm{2}}}\) gas is
  • A
    Pungent
    Correct
  • B
    Odourless
  • C
    Foul smelling
  • D
    sweet smelling
8
Which of the following solution is obtained on reacting zinc metal with NaOH solution
  • A
    \({\rm{N}}{{\rm{a}}_{\rm{3}}}{\rm{2N}}{{\rm{O}}_{\rm{3}}}\)
  • B
    2NO
  • C
    \({\rm{Zn}}{\left( {{\rm{OH}}} \right)_{\rm{2}}}\)
  • D
    \({\rm{N}}{{\rm{a}}_{\rm{2}}}{\rm{Zn}}{{\rm{O}}_{\rm{2}}}\)
    Correct
9
\({\rm{ZnC}}{{\rm{O}}_{\rm{3}}}\left( {\rm{s}} \right)\) undergoes ‘X’ to give ZnO + (oxygen). What does ‘X’ symbolized here?
  • A
    thermal decomposition
    Correct
  • B
    Photo chemical decomposition
  • C
    Electrolysis
  • D
    displacement reactions
10
Which of the following is the incorrect method of preventing rusting?
  • A
    The iron articles should be painted
  • B
    the machine parts should be oiled or greased
  • C
    Iron articles should be covered with plastic
    Correct
  • D
    Galvanised iron pipes are used for water supply.
11
\({\rm{Pb}}{{\rm{I}}_{\rm{2}}}\) is
  • A
    grey in colour
  • B
    Yellow in colour
    Correct
  • C
    red in colour
  • D
    Green in colour
12
The element or compound which undergoes reduction is
  • A
    dehydrating agent
  • B
    Bleaching agent
  • C
    oxidizing agent
    Correct
  • D
    Reducing agent
13
Which of the following is not an example of chemical change?
  • A
    milk changes to curd
  • B
    changing of water to water vapour
    Correct
  • C
    digestion of food in our body
  • D
    rusting of iron
14
\(A{\rm{ Na + B}}{{\rm{H}}_{\rm{2}}}{\rm{O}} \to {\rm{CNaOH + D}}{{\rm{H}}_{\rm{2}}}\) . What would come in place of A , B C and D to balance the equation
  • A
    A = 2, B = 1, C = 2, D = 1
  • B
    A = 2, B = 2, C = 2, D = 1
    Correct
  • C
    A = 3, B = 2, C = 1, D = 2
  • D
    A = 1, B = 1, C = 2, D = 1
15
Which is the formula of magnesium nitride
  • A
    \({\rm{Mg}}{\left( {{\rm{N}}{{\rm{O}}_{\rm{2}}}} \right)_{{\rm{2 }}}}\)
  • B
    \({\rm{M}}{{\rm{g}}_{\rm{2}}}{{\rm{N}}_{\rm{3}}}\)
  • C
    \({\rm{Mg}}{\left( {{\rm{N}}{{\rm{O}}_{\rm{3}}}} \right)_{\rm{2}}}{\rm{ }}\)
  • D
    \({\rm{M}}{{\rm{g}}_{\rm{3}}}{{\rm{N}}_{\rm{2}}}\)
    Correct