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) Mg2+
(b) Mg
(c) Mg+
(d) All above species are inert
The correct answers to the above question in:
Answer: (a)
Mg++ (12 – 2 = 10e– ) = 2, 8
Hence have complete octel hence inert.
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Read more general concepts of chemistry Based General Science Questions and Answers
Question : 1
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 : 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
Which of the following is not an endothermic process?
a) Dissolving conc. H2 SO4 in water
b) Boiling of water
c) Dissolving salts in water
d) Evaporation of water
Answer »Answer: (a)
Dissolution of conc. H2SO4in water produces a lot of heat.
Question : 4
Which of the following involves combination of two elements?
a) 2SO2 + O2 ⟶ 2SO3
b) CaO + CO2 ⟶ CaCO3
c) 4Na + O2 ⟶ 2Na2O
d) NH3 + HCl ⟶ NH4Cl
Answer »Answer: (c)
Both Na and O2 are elements.
Question : 5
The reactions in which two compounds exchange their radicals to form two new compounds are called
a) double displacement reaction
b) displacement reaction
c) decomposition reaction
d) isomerisation reaction
Answer »Answer: (a)
Question : 6
A molal solution is one that contains 1 mole of a solute in
a) one litre of the solution
b) one litre of the solvent
c) 1000 g of the solvent
d) 22.4 litres of the solution
Answer »Answer: (c)
Molal solution contains 1 mole of solute in 1000 g solvent.
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