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) evolution of a gas
(b) change of temperature
(c) change of colour
(d) None of these
The correct answers to the above question in:
Answer: (d)
A chemical reaction is generally accompanied by a change of temperature, colour or evolution of a gas.
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Read more general concepts of chemistry Based General Science Questions and Answers
Question : 1
Which of the following statements is true about chemical equation ?
a) Mass as well as atoms are conserved
b) Mass is conserved
c) Atoms are conserved
d) Molecules are conserved
Answer »Answer: (a)
Question : 2
The formula of sodium pyrophosphate is
a) Na4 P2O7
b) Na2 P2O7
c) Na3 PO4
d) Na3 PO3
Answer »Answer: (a)
Question : 3
The branch of chemistry which deals with study of physical properties and conditions is
a) nuclear chemistry
b) physical chemistry
c) analytical chemistry
d) pharmaceutical chemistry
Answer »Answer: (b)
Question : 4
The empirical formula and molecular mass of a compound are CH2O and 180 g respectively. What will be the molecular formula of the compound ?
a) C6H12O6
b) C9H18O9
c) CH2O
d) C2H4O2
Answer »Answer: (a)
$n =180/\text"Molecular mass of CH_2O" = 180/30$n=6
Question : 5
When electrons are added the resulting ion is called
a) neutral radical
b) basic radical
c) acidic radicals
d) None of these
Answer »Answer: (c)
Cl + e– Cl– (acidic radicals)
Question : 6
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.
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