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)

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 diagram of traditional water harvesting system is given below:

The statement which defines the system and its parts is Piss

(a) This is an ideal setting of the Khadin system and A= Catchment area; B = Saline area & C= Shallow dugwell

(b) This is an ideal setting of the Shallow dugwell system and A= Catchment area; B= Saline area and C= Khadin

(c) This is an ideal setting of Catchment area and A=K hadin, B= Saline area and C= Shallow dugwell

(d) This is showing Saline area and A= Catchment area; B= Khadin and C= Shallow dugwell 1

OR

The major ill effect of mono culture practice in forests is on the

(a) biodiversity which faces large destruction

(b) local people whose basic needs can no longer be met from such forests

(c) industries

(d) forest department