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) neutralisation reaction
(b) Redox reaction
(c) synthesis reaction
(d) decomposition reaction
The correct answers to the above question in:
Answer: (b)
It involves oxidation and reduction.
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Read more general concepts of chemistry Based General Science Questions and Answers
Question : 1
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 : 2
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 : 3
The total number of atoms represented by the compound CuSO4 .5H2O is
a) 5
b) 27
c) 21
d) 8
Answer »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.
Question : 4
When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is formed. This is an example of
a) decomposition reaction
b) combination reaction
c) displacement reaction
d) double decomposition reaction
Answer »Answer: (d)
${CuSO_4} ↙{(Blue)} + H_2S ⟶ {CuS ↓} ↙(Black) + H_2SO_4$
Question : 5
Slow eating away of iron articles in the presence of moist air is called
a) rusting
b) galvanisation
c) crystallisation
d) neutralisation
Answer »Answer: (a)
Rusting is a process in which iron gets converted into hydrated iron oxide in presence of moisture.
$2Fe + 3/2O_2 + xH_2O ⟶ {Fe_2O_3.xH_2O} ↙ {rust}$
Question : 6
A redox reaction is one in which -
a) an acid is neutralised by the base
b) both the substance are reduced
c) both the substance are oxidised
d) one substance is oxidised while the other is reduced
Answer »Answer: (d)
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