set 2 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) Determine the structure of substances
(b) Dry distillation of colouring substances
(c) Identify colour substances
(d) Separate the substances from a mixture
The correct answers to the above question in:
Answer: (d)
Practice classification of elements, chemical bonding, periodicity in properties & physical transformation (set 2) Online Quiz
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Question : 1
In an attempt to demonstrate electrical conductivity through an electrolyte, the following apparatus (Fig.) was set up. Which among the following statement(s) is (are) correct?
- Bulb will not glow because electrolyte is not acidic
- Bulb will glow because NaOH is a strong base and furnishes ions for conduction.
- Bulb will not glow because circuit is incomplete
- Bulb will not glow because it depends upon the type of electrolytic solution
![physical chemistry mcq question answer 9](https://careericons.com/adminicon/bunch/images/physical-chemistry-mcq-question-answer-9.png)
a) 2 only
b) 1 and 3
c) 2 and 4
d) 4 only
Answer »Answer: (a)
NaOH being strong base furnish OH– ions in solution which are responsible for electrolytic condition.
Question : 2
Identify the incorrect statements regarding entropy.
- At absolute zero temperature, entropy of a perfectly crystalline substance is taken to be zero.
- At absolute zero temperature, the entropy of a perfectly crystalline substance is positive.
- Absolute entropy of a substance cannot be determined.
- At 0°C, the entropy of a perfectly crystalline substance is taken to be zero
a) 1, 2 and 4
b) 1, 2 and 3
c) 1, 3 and 4
d) 2, 3 and 4
Answer »Answer: (d)
Third law of Thermodynamics.
Question : 3
Which one of the following when dissolved in H2 O gives hissing sound?
a) Slaked lime
b) Sodalime
c) Limestone
d) Quicklime
Answer »Answer: (d)
Question : 4
Which one of the following properties changes with valency?
a) Equivalent weight
b) Molecular weight
c) Atomic weight
d) Density
Answer »Answer: (a)
Question : 5
Give thought to following statements.
- In the process of osmosis, the solvent moves towards a dilute solution from the concentrated solution.
- In reverse osmosis internal pressure but upon a dilute solution.
a) Only 2
b) Both 1 and 2
c) Only 1
d) Neither 1 nor 2
Answer »Answer: (d)
Question : 6
The octet rule is not valid for which one of the following molecules?
a) H2S
b) NH3
c) CO2
d) BF3
Answer »Answer: (d)
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