Question

Q2. A solution turns red litmus blue. Its pH is likely to be (01 Marks)
(a) 2 (b) 4
(c) 7 (d) 10.
Q3. The electronic configurations of three elements X, Y and Z are X – 2,8; Y-2, 8, 6 and Z
2, 8, 1. Which of the following is correct? (01 Marks)
(a) X is a metal (c) Z is a non-metal
(b) Y is a metal (d) Y is a non- metal and Z is a metal​

Answer 1

Answer:

Q.2,) d) 10

If red litmus paper turns blue, the  solution is alkaline or basic in nature

pH 2 and 4 indicates acidic nature

pH 7 indicated neutral nature

pH 10 indicates basic nature

Q.3.) d) Y is a non-metal and Z is a metal

The valence shell of elements X, Y and Z are 8, 6 and 1 respectively

X follows octet rule hence it is stable and so a noble gas

Y needs 2 electrons to attain stability hence it is a anion and so a non-metal

Z donates 1 electron to attain stability hence it is a cation and so a metal