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
It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas, in the case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is (are) correct?
- In beakers A and B, an exothermic process has occurred.
- In beakers A and B, an endothermic process has occurred.
- In beaker C exothermic process has occurred.
- In beaker C endothermic process has occurred.
(a) 1 and 4
(b) 1 only
(c) 2 only
(d) 2 and 3
The correct answers to the above question in:
Answer: (a)
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Question : 1
Which of the following statements about pH and $H^+$ ion concentration are incorrect?
- Addition of one drop of concentrated HCl in NH4OH solution decreases pH of the solution.
- A solution of the mixture of one equivalent of each of CH3COOH and NaOH has a pH of 7
- pH of pure neutral water is not zero
- A cold and concentrated H2SO4 has lower $H^+$ ion concentration than a dilute solution of H2SO4
a) 1, 2 and 4
b) 1, 2 and 3
c) 1, 3 and 4
d) 2, 3 and 4
Answer »Answer: (a)
CH3COOH is weak acid while NaOH is strong base, so one equivalent of NaOH can not be neutralized with one equivalent of CH3COOH.
Concentrated H2SO4 has higher H+ ion concentration than dilute solution of H2SO4.
Question : 2
Consider the following statements :
- Living beings carry out their metabolic activities with in an optimal pH range.
- There are a variety of strengths when you study acids and base.
a) 1 and 2 both
b) 1 only
c) 2 only
d) None
Answer »Answer: (a)
Question : 3
Consider the following statements :
- The rate of evaporation depends only on the surface area exposed to the atmosphere.
- Latent heat of vaporisation is the heat energy required to change 1 kg of a liquid to gas at atmospheric pressure at its melting point.
a) 1 and 2 both
b) 1 only
c) 2 only
d) None
Answer »Answer: (d)
Question : 4
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 : 5
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 : 6
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.
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