A could be :
1 ) Ar-N2-OH
2) HCl
3) N2
4) ArOH
1 , 2 , 3
2, 3
2,3,4
1,2
The reaction will be
Then
A could be anyone of them HCl , N2 , ArOH
2) HCl
3) N2
4) ArOH
So, the correct option should contain 2,3,4
Option 3 will be correct.
5 g of Na2SO4 was dissolved in x g of H2O. The change in freezing point was found to be 3.820C. If Na2SO4 is 81.5% ionised, the value of x (K
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