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) CrO-4 and CrO-5
(b) CrO2-4 and Cr2O2-7
(c) Cr2O2-7and CrO4-
(d) CrO2-4 and Cr2O2-5
The correct answers to the above question in:
Answer: (b)
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Read more general concepts of chemistry Based General Science Questions and Answers
Question : 1
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)
Question : 2
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 : 3
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 : 4
$Na_2S_2O_3$ represent the compound
a) sodium thiosulphate
b) sodium sulphate
c) sodium sulphite
d) None of these
Answer »Answer: (a)
Question : 5
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 : 6
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 | ${3.33}/{3.33}=1$ |
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