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Science M.C.Q-[Che-1M]

MODEL PAPER - 4 [2026] · CBSE STD 10 (CBSE - English Medium). 7 questions.

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M.C.Q-[Che-1M]

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7 questions · timed · auto-graded

MCQ 11 Mark
A solution turns the colour of turmeric to reddish brown. If the same solution is poured on universal indictor, its colour would change to-
  • ✓
    blue
  • B
    red
  • C
    violet
  • D
    green
Answer
Correct option: A.
blue
(A) blue
Explanation:
Turmeric is a natural indication that can help us determine if a given solution is acidic, basic, or neutral. If the pH is between 7.5 and 9.5, the turmeric paper turns reddish brown. As a result, the solution is straightforward. As a result, the Universal pH indicator will display the colour Blue or a little darker blue. Violet will not be present because violet is only seen in strongly alkaline bases.
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MCQ 21 Mark
Which one of the following properties of Carbon is not responsible for its formation of large number of compounds?
  • ✓
    Isomerism
  • B
    Catenation
  • C
    Tetravalency
  • D
    Allotropy
Answer
Correct option: A.
Isomerism
(A) Isomerism
Explanation:
Isomerism
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MCQ 41 Mark
Match the following with the correct response:
Column AColumn B
(i) Copper is used in electrical appliances(a) Hydrogen sulphide
(ii) Sodium is very reactive(b) Good conductor
(iii) Silver is tarnished(c) Graphite
(iv) A non-metal and a good conductor(d) Stored in kerosene
  • ✓
    (i) - (b), (ii) - (d), (iii) - (a), (iv) - (c)
  • B
    (i) - (d), (ii) - (a), (iii) - (c), (iv) - (b)
  • C
    (i) - (c), (ii) - (b), (iii) - (d), (iv) - (a)
  • D
    (i) - (a), (ii) - (c), (iii) - (b), (iv) - (d)
Answer
Correct option: A.
(i) - (b), (ii) - (d), (iii) - (a), (iv) - (c)
(A) (i) - (b), (ii) - (d), (iii) - (a), (iv) - (c)
Explanation:
- Copper is a good conductor of electricity and is used in electrical appliances.
- Sodium is very reactive and is stored under kerosene.
- Silver is tarnished by hydrogen sulphide. Tarnish is a thin layer of corrosion that forms over it.
- Graphite is an allotrope of carbon and a good conductor of electricity. It is used for making carbon electrodes and graphite electrodes in dry cells and electric arcs.
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MCQ 51 Mark
Copper utensils slowly lose their shiny brown surface and gain a green coat on prolonged exposure to atmospheric air. This is due to the formation of a coating of
  • A
    Copper sulphate
  • B
    Cupric oxide
  • C
    Cuprous oxide
  • ✓
    Copper carbonate
Answer
Correct option: D.
Copper carbonate
(D) Copper carbonate
Explanation:
Copper carbonate
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MCQ 61 Mark
Which of the given statement is correct or wrong:
Statement A: Detergent with less branching in the molecule is degraded more easily than branched-chain detergents.
Statement B: Soaps are 100% biodegradable.
  • ✓
    Both the statements $A$ and $B$ are true
  • B
    Neither statement $A$ nor statement $B$ is true.
  • C
    Statement B is true; Statement A is false.
  • D
    Statement A is true; Statement B is false.
Answer
Correct option: A.
Both the statements $A$ and $B$ are true
(A) Both the statements $A$ and $B$ are true.
Explanation:
All soaps are biodegradable i.e. they can be decomposed by micro-organisms like the bacteria. Branched-chain synthetic detergents are far less degradable than unbranched detergents.
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MCQ 71 Mark
Which of the following is(are) true when $\mathrm{HCl}(\mathrm{g})$ is passed through water?
i. It does not ionise in the solution as it is a covalent compound.
ii. It ionises in the solution
iii. It gives both hydrogen and hydroxyl ion in the solution
iv. It forms hydronium ion in the solution due to the combination of hydrogen ion with water moleculehich of the following is(are) true when $\mathrm{HCl}(\mathrm{g})$ is passed through water?
  • A
    (iii) only
  • B
    (iii) and (iv)
  • C
    (i) only
  • ✓
    (ii) and (iv)
Answer
Correct option: D.
(ii) and (iv)
(D) (ii) and (iv)
Explanation:
Any acid produces hydrogen ion $\left(\mathrm{H}^{+}\right)$which is present as hydronium ion $\left(\mathrm{H}_{3} \mathrm{O}^{+}\right)$because of combination with a water molecule.
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M.C.Q-[Che-1M] - Science STD 10 Questions - Vidyadip