set 2 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 2 EXERCISES
The following question based on general concepts of chemistry topic of general science mcq
(a) Dissolving conc. H2 SO4 in water
(b) Boiling of water
(c) Dissolving salts in water
(d) Evaporation of water
The correct answers to the above question in:
Answer: (a)
Dissolution of conc. H2SO4in water produces a lot of heat.
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Read more general concepts of chemistry Based General Science Questions and Answers
Question : 1
Chemical equations are balanced in accordance with the
a) Law of definite composition
b) Dalton’s law
c) Law of conservation of mass
d) None of these
Answer »Answer: (c)
Question : 2
An organic compound containing C, H and N gave the following analysis : C = 40% ; H = 13.33% ; N = 46.67% Its empirical formula would be
a) CH4N
b) C2H7N2
c) CH5N
d) C2H7N
Answer »Answer: (a)
As the sum of the percentage of C, H & N is 100. Thus it does not contains O atom.
Table for empirical formula
| Element | % | At. Wt. | Rel.Number | Ratio | ||||
| C | 40.00 | 12 | $40/12$= 3.66 | ${3.66}/{3.33}=1.09 ∼ 1$ | ||||
| H | 13.33 | 1 | ${13.33}/1$= 13.33 | ${13.33}/{3.33}=4$ | ||||
| N | 46.67 | 14 | ${46.67}/14$= 3.33 | ${3.33}/{3.33}=1$ |
Question : 3
Select the one that represents a displacement reaction.
a) HCl + NaOH ⟶ NaCl + H2O
b) NaCl + AgNO3 ⟶ AgCl + NaNO3
c) Zn + CuSO4 ⟶ ZnSO4 + Cu
d) C + O2 ⟶ CO2
Answer »Answer: (c)
Question : 4
Which of the following is most unreactive ?
a) Mg2+
b) Mg
c) Mg+
d) All above species are inert
Answer »Answer: (a)
Mg++ (12 – 2 = 10e– ) = 2, 8
Hence have complete octel hence inert.
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