An aqueous solution 'A' turns phenolphthalein solution pink. On addition of an aqueous solution 'B' to 'A, the pink colour disappears. The following statement is true for solution 'A' and 'B'.

Several factories were pouring their wastes in rivers A and B. Water samples were collected from these two rivers. It was observed that sample collected from river A was acidic while that of river B was basic. The factories located near A and B are

(a) Soaps and detergents factories near A and alcohol distillery near B.

(b) Soaps and detergents factories near B and alcohol distillery near A.

(c) Lead storage battery manufacturing factories near A and soaps and detergents factories near B.

(d) Lead storage battery manufacturing factories near $B$ and soaps and detergents factories near A.

In which of the following, the identity of initial substance remains unchanged?

An element ‘X’ is forming an acidic oxide. Its position in modern periodic table will be

A. Group 1 and Period 3 B. Group 2 and Period 3

C. Group 13 and Period 8 D. Group 16 and Period 3

OR

Consider the following statements about an element ‘X’ with number of protons 13.

(A) It forms amphoteric oxide

(B) Its valency is three

(C) The formula of its chloride in XCl₃

The correct statements(a) is/are

A. only (A) B. only (B)

C. (A) and (c) D. (A), (B) and (C)

Assertion (A): Following are the members of a homologous series:

CH₃OH, CH₃CH₂OH, CH₃CH₂CH₂OH

Reason (R): A series of compounds with same functional group but differing by -CH₂- unit is called a homologous series.