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
- 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
The correct answers to the above question in:
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.
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Question : 1
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 : 2
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 : 3
Which is not true about noble gases?
a) They exist in atomic form
b) They are radioactive in nature
c) They are non-metallic in nature
d) Xenon is the most reactive among them
Answer »Answer: (b)
Only Radon (Rn) is radioactive whereas other noble gases (i.e., He, Ne, Ar, Kr, Xe) are non-radioactive.
Question : 4
Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C respectively.
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
Answer »Answer: (a)
Question : 5
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 : 6
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
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