Question

Directions(Q.Nos. 12 - 14 )Each of the following questions consists of two statements, one
is Assertion(A) and the other is Reason(R).Give answer:
(a) If both A and R are true and R is a correct explanation of A
(b) If both A and R are true but R is not a correct explanation of A
(c) If A is true but R is false
(d) If A is false but R may be true/false.
12. Assertion(A): Mendeleev did not leave any gap in his periodic table,
Reason(R): Gaps were necessary for unknown elements
13. Assertion(A): Coppe
r reacts with silver nitrate solution.
Reason (R): Copper is placed higher in the metal activity series than silver. Thus, it can
displace silver from silver nitrate solution
14. Assertion(A): Covalent compounds are generally good conductor of electricity,
Reason(R): Covalent compounds have cations and anions which can migrate to the opposite
poles of an electrolytic cell.​

Answer 1

Answer:

12 .D

13.A

14..D

Explanation:

12.answer......... Mendleev left gaps in his periodic table like Eka Al, Eka B, Eka Si.

13.answer....... Yes it's true that Cu can displace silver

by Electrochemical Series.

14.answer......Covalent compounds are bad conductor of electricity as they don't have ions so both A and R false.