Question

give solution to these two questions
1. The electronic configurations of three elements X, Y and Z are X — 2, 8; Y — 2, 8, 7 and Z — 2, 8, 2. Which of the following is correct?
(a) X is a metal

(b) Y is a metal

(c) Z is a non-metal

(d) Y is a non-metal and Z is a metal

2. The arrangement for Copper, Tin, Lead and Mercury according to reactivity series is:
(a)Tin>Lead>Copper>Mercury

(b)Lead>Copper>Mercury>Tin

(c)Copper>Mercury>Tin>Lead

(d)Mercury>Tin>Lead>Copper

Answer 1

1.(d)

2.(a)

Explanation:

1. X is neon

Y is chlorine

and Z is magnesium

hence X is a non metal, Y is a non metal and Z is a metal

so (d) is the answer

2. the correct sequence is :

(a) tin>lead>copper>mercury

Answer 2

Answer:

1. Correct answer is Option (d).

2. Correct answer is option (a).

Explanation:

(a) According to the configurations, Y comes out to be Chlorine (non-metal) and Z comes out to be Magnesium (metal).

(b) In the reactivity series, Tin lies above Lead, Lead lies above Copper and Copper lies above Mercury.

Hence, Option (a) seems to be the most appropriate one.