Class 10 Science Chemical Reactions And Equations? CBSE Questions & Answers

Class 10 · Science Chemical Reactions And Equations?

This is Science class 10 Science Chemical Reactions and Equations? CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Match the following with correct response. (1) Oxidation (2) Reduction (3) Reducing agent (4) Oxidising agent (A) Gain of electron (B) Electron accepting species (C) Electron losing species (D) Loss of electron
  • A
    1-A, 2-C, 3-B, 4-D
  • B
    1-B, 2-D, 3-A, 4-C
  • C
    1-D, 2-A, 3-C, 4-B
    Correct
  • D
    1-C, 2-B, 3-D, 4-A
2
Match the following with correct response. (1) Chemical change (2) Physical change (3) Exothermic (4) Endothermic (A) Energy releasing (B) Rusting of iron (C) Energy absorbed (D) Dissolution of sugar or salt in water
  • A
    1-D, 2-A, 3-C, 4-B
  • B
    1-C, 2-B, 3-D, 4-A
  • C
    1-A, 2-C, 3-B, 4-D
  • D
    1-B, 2-D, 3-A, 4-C
    Correct
3
Match the following with correct response. (1) Combination reaction(2) Decomposition reaction (3) Displacement reaction (4) Redox reaction (A) \(ZnO + C \to Zn + CO\)(B) \(2{H_2}O \to 2{H_2} + {O_2}\)(C) \(2Mg + {O_2} \to 2MgO\)(D) \(Fe + CuS{O_4} \to FeS{O_4} + Cu\)
  • A
    1-C, 2-B, 3-D, 4-A
    Correct
  • B
    1-A, 2-C, 3-B, 4-D
  • C
    1-B, 2-D, 3-A, 4-C
  • D
    1-D, 2-A, 3-C, 4-B
4
Match the following with correct response. (1) Gain of hydrogen (2) Loss of hydrogen (3) Unpleasant taste and foul small in fatty food (4) Eating away of metal in the presence of air and moisture (A) Reduction (B) Rancidity (C) Oxidation (D) Corrosion
  • A
    1-D, 2-A, 3-C, 4-B
  • B
    1-A, 2-C, 3-B, 4-D
    Correct
  • C
    1-B, 2-D, 3-A, 4-C
  • D
    1-C, 2-B, 3-D, 4-A
5
Match the following with correct response. (1) Evolution of gas (2) Mass of reactant is equal to mass of products (3) Increase in temperature (4) Pop sound (A) conservation of mass (B) Evolution of Hydrogen gas (C) Exothermic change (D) Chemical change
  • A
    1-A, 2-C, 3-B, 4-D
  • B
    1-C, 2-B, 3-D, 4-A
  • C
    1-B, 2-D, 3-A, 4-C
  • D
    1-D, 2-A, 3-C, 4-B
    Correct
6
Match the following with correct response. (1) Reaction in which two substances combine to form new product (2) substance split to form two or more simple substance (3) More reactive metal displaces less reactive metal (4) Loss or gain of electrons occurs (A) Displacement reaction (B) Combination Reaction (C) Redox reaction (D) Decomposition
  • A
    1-A, 2-C, 3-B, 4-D
  • B
    1-B, 2-D, 3-A, 4-C
    Correct
  • C
    1-D, 2-A, 3-C, 4-B
  • D
    1-C, 2-B, 3-D, 4-A
7
Match the following with correct response. (1) Reaction between sodium chloride and silver nitrate (2) Reaction between copper and Iron sulphate (3) Reaction between Bariwise chloride and sodium sulphate (4) Reaction between aqueous solution of Potassium (A) Bromide and chloride gas (B) Light green colour (C) curdy white precipitate (D) White precipitate
  • A
    1-B, 2-D, 3-A, 4-C
  • B
    1-C, 2-B, 3-D, 4-A
    Correct
  • C
    1-A, 2-C, 3-B, 4-D
  • D
    1-D, 2-A, 3-C, 4-B
8
Match the following with correct response. (1) Quick lime is added to water (2) Formula for rust (3) Silver tarnishing (4) Pop sound (A) \(Ca{\left( {OH} \right)_2}\)(B) \({H_2}S\) gas (C) \(F{e_2}{O_3}.x{H_2}O\)(D) \({H_2}\) gas
  • A
    1-A, 2-C, 3-B, 4-D
    Correct
  • B
    1-C, 2-B, 3-D, 4-A
  • C
    1-B, 2-D, 3-A, 4-C
  • D
    1-D, 2-A, 3-C, 4-B
9
Match the following with correct response. (1) Rancidity (2) White washing (3) Deposition of brown substance on iron nails (4) Least reactive (A) Calcium oxide mixed with water (B) Gold (C) Corrosion (D) Oxygen
  • A
    1-D, 2-A, 3-C, 4-B
    Correct
  • B
    1-A, 2-C, 3-B, 4-D
  • C
    1-B, 2-D, 3-A, 4-C
  • D
    1-C, 2-B, 3-D, 4-A
10
A reaction which is opposite of combination reaction(i) \(N{H_4}Cl\rightarrow{{Heat}}N{H_3} + HCl\)(ii) \(2{H_2}O\rightarrow{{dectricity}}2{H_2} + {O_2}\)(iii) \(Fe + {H_2}S{O_4} \to FeS{O_4} + {H_2}\)
  • A
    None of these
  • B
    (i) and (iii)
  • C
    (i) (ii) (iii)
  • D
    (i) and (ii)
    Correct
11
Which is correct about oxidation?A. Gain of oxygen B. Loss of hydrogen C. Loss of electron D. Gain of hydrogen
  • A
    A, B and D
  • B
    B and C
  • C
    A, B and C
    Correct
  • D
    All of these
12
Fatty foods become rancid because of A. Oxidation B. Reduction C. Reaction with HydrogenD. Reaction with hydrogen
  • A
    A and C
  • B
    All of these
  • C
    B and C
  • D
    A and D
    Correct
13
Which of the following statement is correct? A. Electrolysis of water is an example decomposition reaction B. Nitrogen is used to prevent rancidity C. Melting of ice is a physical change D. Corrosion requires presence of both air and moisture
  • A
    A, B and D
  • B
    A and B
  • C
    All of these
    Correct
  • D
    A and C
14
Reaction between water and quick liwe gives rise to calcium hydroxide which of the following statement are correct?A. The reaction is exothermic B. The PH of final solution is less than 7 C. The reaction is endothermicD. The PH of final solution is greater than 7
  • A
    A and D
    Correct
  • B
    All of these
  • C
    C and D
  • D
    A and C
15
For the reaction, \(3Fe + 4{H_2}O \to F{e_2}{O_3} + 4{H_2}.\)Which of the following statement is correct?A. Iron is oxidized B. water is reduced C. water act as reducing agent D. Iron act as reducing agent
  • A
    All of these
  • B
    B and D
  • C
    A and D
  • D
    A, B and D
    Correct