Question

to CBSE, Delhi upto Sr. Sec. Level)
SCIENCE
Lesson no.14-Chemical Effect of Electric Current
Worksheet-2
Name:......
Class VIII Div:.......Rollno:..........Date:....
01..Short Answers Question - Type B
1. a) When electric current is passed through acidified water then what is produced at
(i) Positive carbon electrode (anode)?
(ii) Negative carbon electrode (cathode)?
b) Which offent​

Answer 1

Answer:

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Answer 2

Reduction at cathode: 2H

+

(aq)+2e

−

→H

2

(g)

At N.T.P, 22.4 L (or 22400 mL) of H 2

= 1 mole of H 2

112 mL of H

2 = 22400112

×1=0.005 mole of H 2Moles of H 2

produced =

96500(C/mole − )I(A)×t(s) × mole ratio

0.005mol= 96500(C/mole − )

I(A)×965s × 2 mol e

− 1 mol H 2

I=1A

2...During electrolysis of acidified water using carbon electrodes, O2− ions are oxidized at the positive carbon electrode (anode) and thus oxygen gas is liberated at anode..

3--There are two electrodes in an electrolysis solution: the positive and the negative electrode. ... Positively charged ions (metals and hydrogen), are attracted to the negative electrode (the cathode), where they receive electrons (a process known as oxidation)..