Class 10 Chemical Reactions And Equations CBSE Questions & Answers

Class 10 · Chemical Reactions And Equations

This is online test 03 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 of the statement about the reaction below are incorrect? \({\rm{2PbO }}\left( {\rm{s}} \right) + {\rm{C}}\left( {\rm{s}} \right) \to {\rm{2Pb}}\left( {\rm{s}} \right) + {\rm{C}}{{\rm{O}}_{\rm{2}}}\left( {\rm{g}} \right)\)(i) lead is getting reduced, (ii) Carbon dioxide is getting oxidised, (iii) Carbon is getting oxidised, (iv) Lead oxide is getting reduced
  • A
    ii and iii
  • B
    i and ii
  • C
    all of these
  • D
    iv and iii
    Correct
2
What happens when dilute HCl is added to iron fillings? Select the correct answer.
  • A
    Hydrogen gas and iron chloride are produced
    Correct
  • B
    No reaction takes place
  • C
    Iron salt and water are produced
  • D
    chlorine gas and iron hydroxide are produced
3
Colour of copper sulphate solution changes when an iron nail is dipped in it because of
  • A
    Oxidation reaction
  • B
    Combination reaction
  • C
    Decomposition reaction
  • D
    Displacement reaction
    Correct
4
What happens when copper metal is added to silver nitrate solution?
  • A
    \({\rm{Cu}}{\left( {{\rm{N}}{{\rm{O}}_{\rm{3}}}} \right)_{\rm{2}}}\) will be formed
    Correct
  • B
    Copper being less reactive than Ag can’t displace silver from its solution
  • C
    Cu will be reduced whereas silver will be oxidesed
  • D
    None of these
5
\(F{e_2}{O_3} + 2Al \to A{l_2}{O_3} + 2Fe\) This reaction is an example of -
  • A
    Decomposition reaction
  • B
    Combination reaction
  • C
    Displacement reaction
    Correct
  • D
    Double displacement reaction
6
Pieces of Zn metal are added to four different test tubes containing different solutions. In which test tube no change is observed?
  • A
    \({{\rm{H}}_{\rm{2}}}{\rm{S}}{{\rm{O}}_{\rm{4}}}\)
  • B
    \({\rm{A}}{{\rm{l}}_{\rm{2}}}{\left( {{\rm{S}}{{\rm{O}}_{\rm{4}}}} \right)_{\rm{3}}}\)
    Correct
  • C
    \({\rm{CuS}}{{\rm{O}}_{\rm{4}}}\)
  • D
    \({\rm{FeS}}{{\rm{O}}_{\rm{4}}}\)
7
Metathesis reactions are called-
  • A
    Decomposition reaction
  • B
    Displacement reaction
  • C
    Double displacement reaction
    Correct
  • D
    Combination reaction
8
Solutions of zinc sulphate (I), copper sulphate (II), aluminum sulphate (III) and iron sulphate (IV) were taken in four test tubes. An iron nail was put in each solution and the system was left undisturbed for an hour. In which set up or set ups the iron nail be coated?
  • A
    I and II
  • B
    II and III
  • C
    only in II
    Correct
  • D
    only in IV
9
Conditions necessary for rusting are
  • A
    Presence of iron article
  • B
    Presence of moisture (water)
  • C
    Presence of air
  • D
    All of these
    Correct
10
\({\rm{N}}{{\rm{a}}_{\rm{2}}}{\rm{S}}{{\rm{O}}_{\rm{4}}}{\rm{ (aq) + BaC}}{{\rm{l}}_{\rm{2}}}{\rm{ (aq) }} \to {\rm{BaS}}{{\rm{O}}_{\rm{4}}}{\rm{ }} + 2{\rm{NaCl (aq)}}\) reaction is an example of
  • A
    Photochemical reaction
  • B
    Endothermic reaction
  • C
    Precipitation Reaction
    Correct
  • D
    Exothermic reaction
11
A student added zinc granules to copper sulphate solution taken in a test tube. Out of the following, the correct observation (s) made by the student will be I. zinc granules have no regular shape. II. Zinc granules have silvery grey colour. III. The colour of zinc granules changed to brownish black.
  • A
    II only
  • B
    I only
  • C
    III only
  • D
    I, II and III
    Correct
12
When a student added zinc granules to dilute HCl, a colour less and odourless gas was evolved, which was tested with a burning match stick it was observed that
  • A
    The match stick continue to burn brilliantly
  • B
    The match stick burns with an orange flame.
  • C
    The match stick extinguished and the gas burns with pop sound
    Correct
  • D
    The match stick burns slowly with a blue flame
13
Silver chloride turns grey in sunlight to from silver metal is a
  • A
    photochemical decomposition
    Correct
  • B
    photochemical combination
  • C
    None of these
  • D
    Double displacement
14
If the solution of lead (II) nitrate and potassium iodide are mixed together. What is the colour of the precipitate obtained?
  • A
    Black ppt
  • B
    red ppt
  • C
    yellow ppt
    Correct
  • D
    Blue ppt.
15
A solution of substance ‘X’ is used for white washing. Name the substance ‘X’
  • A
    CuO
  • B
    \({\rm{Ca}}{\left( {{\rm{OH}}} \right)_{{\rm{2 }}}}\)
  • C
    CaO
    Correct
  • D
    \({\rm{CaC}}{{\rm{O}}_{{\rm{3 }}}}\)