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(A) An aqueous solution turns red litmus paper blue if it is basic in nature.$1$. $KCN$: Salt of strong base $(KOH)$ and weak acid $(HCN)$,so it is ba

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$3$

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(A) An aqueous solution turns red litmus paper blue if it is basic in nature.$1$. $KCN$: Salt of strong base $(KOH)$ and weak acid $(HCN)$,so it is basic.$2$. $K_2SO_4$: Salt of strong base $(KOH)$ and strong acid $(H_2SO_4)$,so it is neutral.$3$. $(NH_4)_2C_2O_4$: Salt of weak base $(NH_4OH)$ and weak acid $(H_2C_2O_4)$,so it is weakly acidic/neutral.$4$. $NaCl$: Salt of strong base $(NaOH)$ and strong acid $(HCl)$,so it is neutral.$5$. $Zn(NO_3)_2$: Salt of weak base $(Zn(OH)_2)$ and strong acid $(HNO_3)$,so it is acidic.$6$. $FeCl_3$: Salt of weak base $(Fe(OH)_3)$ and strong acid $(HCl)$,so it is acidic.$7$. $K_2CO_3$: Salt of strong base $(KOH)$ and weak acid $(H_2CO_3)$,so it is basic.$8$. $NH_4NO_3$: Salt of weak base $(NH_4OH)$ and strong acid $(HNO_3)$,so it is acidic.$9$. $LiCN$: Salt of strong base $(LiOH)$ and weak acid $(HCN)$,so it is basic.The compounds that are basic are $KCN$,$K_2CO_3$,and $LiCN$. The total number is $3$.

Amongst the following,the total number of compounds whose aqueous solution turns red litmus paper blue is
$KCN$,$K_2SO_4$,$(NH_4)_2C_2O_4$,$NaCl$,$Zn(NO_3)_2$,$FeCl_3$,$K_2CO_3$,$NH_4NO_3$,$LiCN$

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Amongst the following,the total number of compounds whose aqueous solution turns red litmus paper blue is$KCN$,$K_2SO_4$,$(NH_4)_2C_2O_4$,$NaCl$,$Zn(NO_3)_2$,$FeCl_3$,$K_2CO_3$,$NH_4NO_3$,$LiCN$