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) 5
(b) 27
(c) 21
(d) 8
The correct answers to the above question in:
Answer: (c)
1 atom of Cu + 1 atom of sulphur + 9 atoms of oxygen + 10 atoms of hydrogen.
Total number of atoms in the compound is 21.
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Question : 1
AgNO3(aq) + NaCl(aq) ⟶ AgCl(s) + NaNO3(aq) Above reaction is -
a) combination reaction
b) precipitation reaction
c) double displacement reaction
d) Both (b) and (c)
Answer »Answer: (d)
This reaction is double displacement and precipitation as well because insoluble silver chloride gets precipitated.
Question : 2
Which is not a balanced equation ?
a) Fe + Cl2 ⟶ FeCl3
b) NaOH + HCl ⟶ NaCl + H2O
c) Mg + CuSO4 ⟶ MgSO4 + Cu
d) Mg + 2HNO3 ⟶ Mg(NO3 )2 + H2
Answer »Answer: (a)
2Fe + 3Cl2 ⟶ 2FeCl3 (balanced chemical eqn.)
Question : 3
Which of the following does not corrode when exposed to the atmosphere?
a) Gold
b) Iron
c) Copper
d) Silver
Answer »Answer: (a)
Gold is a noble metal.
Question : 4
In the following equations : NaCO3 + xHCL ⟶ 2NaCl + CO2 + H2O, the value x is
a) 3
b) 1
c) 2
d) 4
Answer »Answer: (c)
Na2CO3 2HCl ⟶ 2NaCl CO2 + H2O
Question : 5
Which of the following statements is not correct?
a) A chemical equations tells us about the atom or molecules of the reactants and products involved in a reaction
b) A chemical equations tells us about the substances involved in a reaction.
c) A chemical equations informs us about the symbols and formula of substances involved in a reaction
d) All are correct
Answer »Answer: (d)
Question : 6
CuO + H2 ⟶ Cu + H2O Above reaction is an example of
a) neutralisation reaction
b) Redox reaction
c) synthesis reaction
d) decomposition reaction
Answer »Answer: (b)
It involves oxidation and reduction.
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