set 1 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) inert metals
(b) noble gases
(c) alkali metals
(d) halogens
The correct answers to the above question in:
Answer: (d)
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Question : 1
Which of the following group of elements belongs to alkali metals?
a) 37, 19, 3, 55
b) 9, 17, 35, 53
c) 1, 12, 30, 4, 62
d) 12, 20, 56, 88
Answer »Answer: (a)
Alkali metals have 1 electron in valence shell.
Question : 2
Match List-I with List-II:
List-I | List-II |
A. Li2 | 1. 3 |
B. N2 | 2. 1.5 |
C. Be2 | 3. 1.0 |
D. O2 | 4. 0 |
5. 2 |
a) A – (4), B – (1), C – (5), D – (3)
b) A – (2), B – (3), C – (1), D – (5)
c) A – (3), B – (1), C – (4), D – (5)
d) A – (3), C – (2), C – (5), D – (1)
Answer »Answer: (c)
B.O. = $1/2$ [Nb – Na ]
∴ Li2 = ${4 - 2}/2$ = 1;
N2 = 3;
Be = 0,
O2 = 2
Question : 3
Because of impurities the boiling point of a liquid
a) Decreases
b) Remains constant
c) Increases
d) They are not related
Answer »Answer: (c)
Question : 4
Which one of the following is a diagonally related pair?
a) Na, Mg
b) B, Si
c) H, Be
d) K, Ca
Answer »Answer: (b)
Question : 5
In the KMnO4 molecule, the oxidation states of the elements Potassium (K), Manganese (Mn) and Oxygen (O) are respectively
a) +1, +7, – 2
b) 0, 0, 0
c) +1, +5, – 2
d) +1, +7, 0
Answer »Answer: (a)
Question : 6
The long form of periodic table consists of
a) seven periods and eighteen groups
b) eight periods and eighteen groups
c) seven periods and eight groups
d) eighteen periods and eight groups
Answer »Answer: (a)
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