Question

which among the following turn blue litmus to red litmus 1.k2so4
2.(nh4)2no3
3.kno3
4.(nh4)2co3 ​

Answer 1

Answer:

KNO3 turn blue litmus to red

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Answer 2

$(NH_4)2NO_3$  turn blue litmus to red litmus

Explanation:

Acidic salts are those which are formed by combination of strong acid and a weak base and have acidic pH of less than 7. They turn blue litmus red.

Basic salts are those which are formed by combination of weak acid and a strong base and have basic pH of more than 7. They turn red litmus blue.

Neutral salts are those which are formed by combination of weak acid and a weak base or by combination of strong acid and a strong base and have neutral pH equal to 7. They do not affect litmus.

$K_2SO_4$ is a neutral salt formed by combination of strong acid $H_2SO_4$ and a strong base $KOH$.

$(NH_4)2NO_3$  is a acidic salt formed by combination of strong acid $HNO_3$ and a weak base $NH_4OH$.

$KNO_3$  is a neutral salt formed by combination of strong acid $HNO_3$ and a strong base $KOH$.

$(NH_4)2CO_3$  is a neutral salt formed by combination of weak acid $H_2CO_3$ and a weak base $NH_4OH$.

Thus $(NH_4)2NO_3$ turn blue litmus to red litmus.

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