Dinesh Chemistry Class 9. We covered all the Dinesh Chemistry Class 9 in this post for free so that you can practice well for the exam.
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Dinesh Chemistry Class 9 Objective for Students
A 5-ampere current is passed through a solution of zinc sulfate for 40 minutes. The amount of zinc deposited at the cathode is
(A) 0.4065 g
(B) 65.05 g
(C) 40.65 g
(D) 4.065 g
Option d – 4.065 g
The mass of carbon anode consumed (given only carbon dioxide) in the production of 270 kg of aluminum metal from bauxite by the Hall process is
(A) 180 kg
(B) 270 kg
(C) 540 kg
(D) 9.0 kg
Option d – 9.0 kg
A device that converts the energy of combustion of fuels like hydrogen and methane, directly into electrical energy is known as
(A) Dynamo
(B) Ni-Cd cell
(C) Fuel cell
(D) Electrolytic cell
Option c – Fuel cell
A certain current liberated 0.504 g of hydrogen in 2 hours. How many grams of copper can be liberated by the same current flowing for the same time in a copper sulfate solution?
(A) 31.8 g
(B) 16.0 g
(C) 12.7 g
(D) 63.5 g
Option b – 16.0 g
The amount of electric charge, that should be passed through the CuSO4 solution using Cu electrodes to deposit 63.5 gm of Cu on the cathode is
(A) 9650 C
(B) 193000 C
(C) 96500 C
(D) 19300 C
Option b – 193000 C
At STP 1.12 liter of hydrogen is obtained on flowing a current for 965 seconds in a solution the value of current in ampere is
(A) 10
(B) 1.5
(C) 1.0
(D) 2
Option a – 10
The weight of silver (at. wt. = 108) displaced by a quantity of electricity that displaces 5600 ml of O₂ at STP will be
(A) 5.4 g
(B) 10.8 g
(C) 54.0 g
(D) 108.0 g
Option d – 108.0 g
How many grams of cobalt metal will be deposited when a solution of cobalt (II) chloride is electrolyzed with a current of 10 amperes for 109 minutes (1 Faraday 1 96,500 C, Atomic mass of CO = 59 u)
(A) 4.0
(B) 20.0
(C) 40.0
(D) 0.66
Option b – 20.0
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