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
Statement (A):
Temperature below 0ºC is achieved by the mixture of salt and ice.
Reason (R):
Salt increases the freezing point of ice.
In the context of above statements which one of the following is correct?
(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
The correct answers to the above question in:
Answer: (b)
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Question : 1
This question consist of two statements, Statement I and Statement II. You are to examine these two statements carefully and select the answer to these items using the codes given below.
Statement I :
Conversion of blue copper sulphate to black cupric oxide on heating is a physical change.
Statement II :
A change in which chemical composition does not change is called physical change.
a) Both the statements are individually true but Statement II is not correct explanation of Statement I.
b) Statement I is true but Statement II is false.
c) Both the statements individually true and Statement II is the correct explanation of Statement I.
d) Statement I is false but Statement II is true.
Answer »Answer: (d)
Question : 2
Which one of these group of elements is also called the halogen family?
a) Group 18
b) Group 10
c) Group 16
d) Group 17
Answer »Answer: (d)
Question : 3
The elements with atomic numbers 2, 10, 18, 36, 54 and 86 are all –
a) noble gases
b) noble metals
c) halogens
d) light metals
Answer »Answer: (a)
Question : 4
Match List-I (Oxidation number) with List II (The element) and select the correct answer using the codes given below the lists :
List-I (Oxidation number) | List-II (The elements) |
A. 2 | 1. Oxidation number of Mn in Mn$O_2$ |
B. 3 | 2. Oxidation number of S in $H_2S_2O_7$ |
C. 4 | 3. Oxidation number of Ca in CaO |
D. 6 | 4. Oxidation number of Al in NaAl$H_4$ |
a) A-4; B-3; C-1; D-2
b) A-3; B-4; C-2; D-1
c) A-3; B-4; C-1; D-2
d) A-4; B-3; C-2; D-1
Answer »Answer: (c)
Question : 5
Which scientist came up with the concept of a periodic table that included all of the known elements?
a) Dmitri Mendeleev
b) Antoine Lavoisier
c) Joseph Priestly
d) Albert Einstein
Answer »Answer: (a)
Dmitri Mendeleev is credited with designing the modern periodic table. Joseph Priestly and Antoine Lavoisier were both chemists. Albert Einstein developed theories on photoelectric effect.
Question : 6
In the reaction 4Fe + 3O2 → 4Fe3+ + 6O 2−
Which of the following statements is incorrect?
a) Metallic iron acts as a reducing agent
b) $O_2$ acts as an oxidising agent
c) It is a redox reaction
d) Metallic iron is reduced to F$e^{3+}$
Answer »Answer: (d)
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