set 3 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 4 EXERCISES
The following question based on classification of elements, chemical bonding, periodicity in properties & physical transformation topic of general science mcq
(a) Gas in a liquid
(b) Solid in a gas
(c) Liquid in a gas
(d) Liquid in liquid
The correct answers to the above question in:
Answer: (c)
Practice classification of elements, chemical bonding, periodicity in properties & physical transformation (set 3) Online Quiz
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Read more chemistry Based General Science Questions and Answers
Question : 1
Consider the following equation for the formation of ammonia from nitrogen and hydrogen:
N2 + 3H2 = 2NH3
How many hydrogen molecules are required to react with 100 molecules of nitrogen?
a) 200
b) 300
c) 100
d) 400
Answer »Answer: (b)
Question : 2
The metal which is hard and has high m.p. and used in electric bulbs is
a) Pt
b) Fe
c) Ni
d) W
Answer »Answer: (d)
Tungsten (W) is used in electric bulbs.
Question : 3
Match List-I with List-II:
List-I | List-II |
A. $C + O_2 ⟶ CO_2$ | 1. Displacement |
B. $2AgBr ⟶ ↖ {Light} 2Ag+Br_2$ | 2. Combination |
C. Zn + $CuSO_4 ⟶ ZnSO_4 + Cu$ | 3. Decomposition |
D. $2Ca + O_2 ⟶ 2CaO$ | 4. Oxidation |
E. $BaCl_2 + H_2SO_4 ⟶ BaSO_4 + 2HCl$ | 5. Double displacement reaction |
a) A – (2), B – (3), C – (4), D – (1), E – (5)
b) A – (3), B – (2), C – (1), D – (4), E – (5)
c) A – (2), B – (3), C – (1), D – (4), E – (5)
d) A – (2), B – (3), C – (1), D – (5), E – (4)
Answer »Answer: (c)
Question : 4
Which of the following are correct statements?
- The canonical structures have no real existence
- Every $AB_5$ molecule does in fact have square pyramidal structure
- Multiple bonds are always shorter than corresponding single bonds
- The electron-deficient molecules can act as Lewis acids
a) 2, 3 and 4
b) 1, 2 and 3
c) 1, 3 and 4
d) 1, 2 and 4
Answer »Answer: (c)
Question : 5
Which of the following elements does not lose an electron easily?
a) F
b) Mg
c) Na
d) Al
Answer »Answer: (a)
F has a tendency to gain an electron.
Question : 6
The noble gases are unreactive because
a) they have a full outer shell of electrons
b) they have a half outer shell of neutrons
c) they react with sodium
d) they are too thin
Answer »Answer: (a)
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