Chemistry
Arrange the following according to the instructions given in brackets:
(a) C2H2, C3H6, CH4, C2H4 (In the increasing order of the molecular weight)
(b) Cu2+, Na+, Zn2+, Ag+ (The order of Preferential discharge at the cathode)
Electrolysis
ICSE 2023
30 Likes
Answer
(a) Molecular weight of C2H2 = 2[12] + 2[1] = 26
Molecular weight of C3H6 = 3[12] + 6[1] = 42
Molecular weight of CH4 = 12 + 4[1] = 16
Molecular weight of C2H4 = 2[12] + 4[1] = 28
Hence, increasing order of molecular weights is :
CH4 < C2H2 < C2H4 < C3H6
(b) Ag+, Cu2+, Zn2+, Na+
Answered By
15 Likes
Related Questions
Calculate:
(a) The percentage of phosphorus in the fertilizer super phosphate Ca(H2PO4)2 correct to 1 decimal point.
[At. Wt. H=1, P=31, O=16, Ca=40]
(b) Write the empirical formula of C8H18
Answer the following questions with reference to electrorefining of copper:
(a) What is the anode made of?
(b) What do you observe at the cathode?
(c) Write the reaction taking place at the cathode.
Differentiate between the following pairs based on the criteria given in the brackets:
(a) Cane sugar and hydrated copper sulphate [using concentrated H2SO4]
(b) Sulphuric acid and hydrochloric acid [type of salts formed]
Convert the following reactions into a balanced chemical equation:
(a) Ammonia to nitric oxide using oxygen and platinum catalyst.
(b) Sodium hydroxide to sodium sulphate using sulphuric acid.
(c) Ferrous sulphide to hydrogen sulphide using hydrochloric acid.