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) Mass as well as atoms are conserved
(b) Mass is conserved
(c) Atoms are conserved
(d) Molecules are conserved
The correct answers to the above question in:
Answer: (a)
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Read more general concepts of chemistry Based General Science Questions and Answers
Question : 1
The formula of sodium pyrophosphate is
a) Na4 P2O7
b) Na2 P2O7
c) Na3 PO4
d) Na3 PO3
Answer »Answer: (a)
Question : 2
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 : 3
The empirical formula of a compound is CH2 . One mole of this compound has a mass of 42 grams. Its molecular formula is :
a) CH2
b) C3H6
c) C3H8
d) C2H2
Answer »Answer: (b)
Empirical formula of compound = $CH_2$ Molecular mass of the compound = 42 ∴ n = $42/14$ = 3 ∴ Hence molecular formula = $C_3H_6$
Question : 4
The observation that does not indicate a chemical reaction is
a) evolution of a gas
b) change of temperature
c) change of colour
d) None of these
Answer »Answer: (d)
A chemical reaction is generally accompanied by a change of temperature, colour or evolution of a gas.
Question : 5
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 : 6
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)
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