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

MODEL PAPER - 10 [2026] · CBSE STD 10 (CBSE - English Medium). 8 questions.

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

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8 questions · timed · auto-graded

MCQ 11 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.
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 21 Mark
Reaction between X and Y , forms compound Z . X loses electron and Y gains electron. Which of the following properties is not shown by Z ?
  • A
    Has high melting point
  • ✓
    Has low melting point
  • C
    Occurs as solid
  • D
    Conducts electricity in molten state
Answer
Correct option: B.
Has low melting point
(B) Has low melting point
Explanation:
Given that the compound X and Y form compound Z .
Here, X loses electron and Y gains electron meaning that an ionic or an electrovalent bond is formed. Thus, the compound Z is a crystalline solid, has high melting and boiling point. It conducts electricity in the molten state.
The compound Z cannot have a low melting point.
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MCQ 31 Mark
If 10 mL of $\mathrm{H}_{2} \mathrm{SO}_{4}$ is mixed with 10 mL of $\mathrm{Mg}(\mathrm{OH})_{2}$ of the same concentration, the resultant solution will give the following colour with universal indicator:
  • A
    Yellow
  • B
    Red
  • C
    Blue
  • ✓
    Green
Answer
Correct option: D.
Green
(D) Green
Explanation:
Sulphuric acid produces two $\mathrm{H}^{+}$ions on dissociation.
$\mathrm{H}_{2} \mathrm{SO}_{4} \rightleftarrows 2 \mathrm{H}^{+}+\mathrm{SO}_{4}^{2-}$
When equal volume of both solutions are mixed together they form water and salt by neutralisation reaction as one is acid and other is base.
$2 \mathrm{H}^{+}+\mathrm{SO}_{4}^{2-}+\mathrm{Mg}^{2+}+2 \mathrm{OH}^{-} \rightarrow 2 \mathrm{H}_{2} \mathrm{O}+\mathrm{MgSO}_{4}$
Therefore, for neutral solution universal indicator shows green colour.
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MCQ 41 Mark
The number of shells required to write the electronic configuration of Potassium (At. No. 19)
  • A
    1
  • B
    2
  • ✓
    4
  • D
    3
Answer
Correct option: C.
4
(C) 4
Explanation:
4
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MCQ 51 Mark
A student adds one big iron nail each in four test tubes containing solution of zinc sulphate, aluminium sulphate. copper sulphate and iron sulphate. A reddish brown coating was observed only on the surface of iron nail which was added in the solution of:
Image
  • A
    Aluminium sulphate
  • B
    Iron sulphate
  • C
    Zinc sulphate
  • ✓
    copper sulphate
Answer
Correct option: D.
copper sulphate
(D) copper sulphate
Explanation:
The copper sulphate solution will turn green due to the formation of iron sulphate. A reddish brown coating of copper is formed on the nail. Iron is less reactive than aluminium and zinc. It is however, more reactive than copper. It displaces copper from its solution (displacement reaction). The less reactive copper comes out of the solution and more reactive iron goes into the solution.
$\mathrm{CuSO}_{4}(\mathrm{aq})+\mathrm{Fe}(\mathrm{s})$ à $\left.\mathrm{FeSO}_{4}(\mathrm{aq})+\mathrm{Cu} \mathrm{s}\right)$
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MCQ 61 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 tamished(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 71 Mark
Which of the following statements is true for an amphoteric oxide?
  • A
    It reacts with acid as well as base to form salt and hydrogen gas.
  • B
    It reacts only with base and does not form water.
  • C
    It reacts only with acid and does not form water.
  • ✓
    It reacts with both acid as well as base to form salt and water.
Answer
Correct option: D.
It reacts with both acid as well as base to form salt and water.
(D) It reacts with both acid as well as base to form salt and water.
Explanation:
It reacts with both acid as well as base to form salt and water.
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MCQ 81 Mark
When sodium hydrogen carbonate is added to ethanoic acid a gas evolves.
Consider the following statements about the gas evolved?
A. It turns lime water milky.
B. It is evolved with a brisk effervescence.
C. It has a smell of burning sulphur.
D. It is also a by-product of respiration.
  • A
    (B) and (D) only
  • B
    (A) and (B) only
  • ✓
    (A), (B) and (D)
  • D
    (A), (C) and (D)
Answer
Correct option: C.
(A), (B) and (D)
(C) (A), (B) and (D)
Explanation:
(A), (B) and (D)
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M.C.Q-[Che-1M] - Science STD 10 Questions - Vidyadip