(A) O2 and N2
(B) CO and N2
(C) CO2 and water vapours
(D) O2 and water vapours
Answer: (C) CO2 and water vapours
Category: Chemistry MCQs
The oxidation state of Mn in KMnO4 is:
(A) +8
(B) +3
(C) +7
(D) +4
Answer: (C) +7
The answer to: The oxidation state of Mn in KMnO4 is: +7
By-product(s) produced in Nelson’s cell is/are:
(A) NaOH
(B) H2 only
(C) Cl2 only
(D) both B and C
Answer: (A) NaOH
Which of the following is used for cooking utensils?
(A) Gold
(B) Iron
(C) Plastics
(D) Silver
Answer: (D) Silver
The freezing point of water is 0 ͦ C while its boiling point is 100 ͦ C at STP, its physical state at 120 ͦ C will be?
(A) Gas
(B) Liquid
(C) Solid
(D) Mixture of gas and liquid
Answer: (D) Mixture of gas and liquid