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

MCQ 11 Mark

Bottle A contains oxalic acid and bottle B contains sodium carbonate solution. When pH paper is dipped in each of the solutions, the colour seen in A and B respectively be

✓
orange, blue
B
green, blue
C
blue, orange
D
orange, green

Answer

Correct option: A.

orange, blue

(A) orange, blue
Explanation:
The colour of pH paper is orange in acidic medium, i.e. in oxalic acid while it is blue in basic medium, i.e. in sodium carbonate solution.

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MCQ 21 Mark

Which of the following statements are correct regarding isomers?
I. Isomers have same structural formula.
II. Isomers have same molecular formula.
III. Isomers have same chemical properties.
IV. The compound C₃⁢H₈ has no isomers.

✓
II and IV only
B
I, III and IV only
C
I and III only
D
I, II, III and IV

Answer

Correct option: A.

II and IV only

(A) II and IV only
Explanation:
Isomers have same molecular formula but different structural formulae. Isomers have different physical and chemical properties.

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MCQ 31 Mark

Which element is stored in water and which element is stored in kerosene?

A
Calcium and phosphorus respectively
B
Sodium and phosphorus respectively
✓
Phosphorus and sodium respectively
D
Magnesium and sodium respectively

Answer

Correct option: C.

Phosphorus and sodium respectively

(C) Phosphorus and sodium respectively
Explanation:
Phosphorus and sodium are highly reactive at room temperature. Phosphorus is stored underwater. Sodium reacts with water, hence it is stored under kerosene.

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MCQ 41 Mark

Match the following with the correct response:

(1) Soap	(A) Sodium salts of long-chain of sulphonic acids
(2) Detergents	(B) Esterification
(3) The reaction of $\mathrm{CH}_{3} \mathrm{COOH}$ with metal hydroxides	(C) Neutralization
(4) The reaction of $\mathrm{CH}_{3} \mathrm{COOH}$ with alcohols	(D) Sodium salts of long-chain fatty acids

✓
(i) - (d), (ii) - (a), (iii) - (c), (iv) - (b)
B
(i) - (b), (ii) - (d), (iii) - (a), (iv) - (c)
C
(i) - (a), (ii) - (c), (iii) - (b), (iv) - (d)
D
(i) - (c), (ii) - (b), (iii) - (d), (iv) - (a)

Answer

Correct option: A.

(i) - (d), (ii) - (a), (iii) - (c), (iv) - (b)

(A) (i) - (d), (ii) - (a), (iii) - (c), (iv) - (b)
Explanation:
- Soaps are sodium or potassium salts of long-chain fatty acids.
- Detergents are sodium salts of a long chain of sulphonic acids.
- The reaction of acetic acid with metal hydroxides is a neutralization reaction.
CH₃⁢COOH+NaOH→CH₃⁢COONa+H₂⁡O
- The reaction in which a carboxylic acid combines with an alcohol to form an ester is called esterification. When acetic acid CH₃⁢COOH reacts with alcohol, an ester is formed along with water.
CH₃⁢COOH+C₂⁢H₅⁡OH→CH₃⁢COOC₂⁢H₅+H₂⁡O

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MCQ 51 Mark

The name and formula of third member of homologous series of alkyne is:

A
Butyne $\mathrm{C}_{4} \mathrm{H}_{8}$
B
Propyne $\mathrm{C}_{3} \mathrm{H}_{6}$
✓
Butyne $\mathrm{C}_{4} \mathrm{H}_{6}$
D
Propyne $\mathrm{C}_{3} \mathrm{H}_{4}$

Answer

Correct option: C.

Butyne $\mathrm{C}_{4} \mathrm{H}_{6}$

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MCQ 61 Mark

Calcium oxide reacts vigorously with water to produce slaked lime.
CaO⁡(s) +H₂⁡O⁡(l) →Ca⁢(OH)_2⁢(aq)
This reaction can be classified as :
A. Combination reaction
B. Exothermic reaction
C. Endothermic reaction
D. Oxidation reaction
Which of the following is the correct option?

A
C and D
B
A, C and D
C
A and C
✓
A and B

Answer

Correct option: D.

A and B

(D) A and B
Explanation:
$\mathrm{CaO}(\mathrm{s})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightarrow \mathrm{Ca}(\mathrm{OH})_{2}(\mathrm{aq})$
A combination reaction is a reaction where two or more elements or compounds combine to form a single compound.
Calcium oxide combines with water to form calcium hydroxide. Hence, it is a combination reaction.
It is an exothermic reaction as a lot of heat liberate with hissing sound during the reaction.

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MCQ 71 Mark

Which of the following statements are correct?
A. Chemical name of bleaching powder is calcium oxychloride.
B. Bleaching powder is used for sterilization of drinking water.
C. Bleaching powder is alkaline in nature hence it is used as antacid.
D. Bleaching powder is manufactured by Hasen Clever process.

A
All of these
✓
A, B and D
C
A and C
D
B and C

Answer

Correct option: B.

A, B and D

(B) A, B and D
Explanation:
Formula for bleaching powder is $\mathrm{CaOCl}_{2}$. It has chlorine available which acts as a disinfectant. It cannot be used as an antacid because it is non-edible. Hans Clever is the most economical method of manufacturing bleaching powder.

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