Element X is strongly electropositive and element Y is strongly electronegative. Both are univalent. The compound formed would be

The modern atomic unit is based on the mass of ______.

The total no of electron present in 18 ml of water is ______.

M is molecular weight of KMnO₄. The equivalent wight of KMnO₄ when it is converted into K₂MnO₄ is