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Question:

Amongst the following, the total number of compounds whose aqueous solution turns red litmus paper blue is: KCN, K2SO4, (NH4)2C2O4, NaCl, Zn(NO3)2, FeCl3, K2CO3, NH4NO3, LiCN

0

9

2

4

1

3

5

6

7

8

Solution:

KCN, K2CO3, and LiCN are basic in nature and their aqueous solutions turn red litmus paper blue.