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) Gold
(b) Iron
(c) Copper
(d) Silver
The correct answers to the above question in:
Answer: (a)
Gold is a noble metal.
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Read more general concepts of chemistry Based General Science Questions and Answers
Question : 1
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 : 2
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 : 3
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 : 4
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 : 5
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.
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