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) The properties of middle element is roughly average of the other two elements
(b) The elements of triads belong to the same group of modern periodic table
(c) The atomic weight of middle element is roughly average of the other two elements
(d) The elements of triads have same valency electrons.
The correct answers to the above question in:
Answer: (a)
Practice classification of elements, chemical bonding, periodicity in properties & physical transformation (set 1) Online Quiz
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Question : 1
Assertion (A):
A chemical reaction becomes faster at a higher temperature.
Reason (R):
At higher temperature, molecular motion becomes more rapid.
a) Both (A) and (R) are true, but (R) is not the correct explanation of (A)
b) (A) is true, but (R) is false
c) Both (A) and (R) are true and (R) is the correct explanation of (A)
d) (A) is false, but (R) is true
Answer »Answer: (c)
Question : 2
On moving horizontally across a period, the number of electrons in the outermost shell increases from ...... to .......
a) 2, 18
b) 1, 8
c) 2, 8
d) 1, 18
Answer »Answer: (b)
Question : 3
Which element forms the highest number of compounds in the periodic table?
a) Oxygen
b) Silicon
c) Carbon
d) Sulphur
Answer »Answer: (c)
Question : 4
Which of the following statements is incorrect from the point of view of modern periodic table ?
a) There are eighteen vertical columns called groups
b) Transition elements fit in the middle of long periods
c) Elements are arranged in the order of increasing atomic number
d) Noble gases are arbitrarily placed in eighteenth group
Answer »Answer: (d)
Question : 5
Change of water into the vapour is called
a) Physical
b) Chemical
c) Natural
d) Biological
Answer »Answer: (a)
Question : 6
The elements with atomic numbers 2, 10, 18, 36, 54 and 86 are all
a) noble gases
b) noble metals
c) halogen
d) light metals
Answer »Answer: (a)
All these are noble gases with completely filled outermost shell.
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