set 1 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) CH4 + 2O2 ⟶ CO2 + 2H2O
(b) C + O2 ⟶ CO2
(c) CaCO3 ⟶ CaO + CO2
(d) CaO + H2 O ⟶ Ca(OH)2
The correct answers to the above question in:
Answer: (c)
Heat is required to decompose calcium carbonate. Thus this reaction proceeds with absorption of heat therefore it is endothermic reaction.
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Read more general concepts of chemistry Based General Science Questions and Answers
Question : 1
Valency of an atom or radicals is
a) its combining capacity
b) ionisation energy
c) electron affinity of atom
d) size of atom
Answer »Answer: (a)
Question : 2
An organic compound containing C, H and O gave on analysis C – 40% and H – 6.66%. Its empirical formula would be
a) CH2O
b) C3H6O
c) CHO
d) CH4O
Answer »Answer: (a)
Element | % | At.Wt. | Rel.Number | Ratio | ||||
C | 40 | 12 | $40/12$= 3.33 | ${3.33}/{3.33}=1$ | ||||
H | 6.66 | 1 | ${6.66}/1$= 6.66 | ${6.66}/{3.33}=2$ | ||||
O | 53.34 | 16 | ${53.34}/16$= 3.33 | ${3.33}/{3.33}=1$ |
Question : 3
Which one is a decomposition reaction ?
a) 2H2O $⟶ ↖ {Electrolysis}$ 2H2 + O2
b) 2HgO $⟶ ↖ {heat}$ 2Hg + O2
c) CaCO3 $⟶ ↖ {heat}$ CaO + CO2
d) All the above reactions are decomposition reaction
Answer »Answer: (d)
In all these reactions the reactants decompose to form simpler products.
Question : 4
Which one is a combination reaction ?
a) Ca(OH)2 + Na2CO3 ⟶ 2NaOH + CaCO3 ↓
b) Formation of a mixture of carbon monoxide and hydrogen. When steam is passed over red hot iron.
c) Reaction of water with sodium metal to form sodium hydroxide and hydrogen.
d) Preparation of stannic chloride (Tin (iv) chloride) by passing chlorine gas into molten tin (Sn).
Answer »Answer: (d)
Sn + 2Cl2 SnCl4.
Question : 5
Which of the following statement is not correct ? To prevent food from getting rancid, we
a) flush bags of chips with an inert gas
b) store the food in air-tight containers
c) add antioxidants
d) increase the temperature of the food
Answer »Answer: (d)
Increase the temperature of the food.
Question : 6
The branch of chemistry which deals with study of the methods of detection and determination of elements and compounds is
a) Analytical chemistry
b) Physical chemistry
c) Nuclear chemistry
d) Bio chemistry
Answer »Answer: (a)
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