MCQ
Which of the following salt cannot be possible
- ✓Sodium hydrogen hypophosphite
- BSodium dihyttrogen pyrophosphate
- CSodium hydrogen hypophosphate
- DSodium dihydrogen hypophosphate
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| List $I$ Vitamin | List $II$ Deficiency disease |
| $A$ Vitamin $A$ | $I.$ Beri-Beri |
| $B$ Thiamine | $II.$ Cheilosis |
| $C$ Ascorbic acid | $III.$ Xeropthalmia |
| $D$ Riboflavin | $IV.$ Scurvy |
Choose the correct answer from the options given below:
Codes: $ \quad P \quad Q \quad R \quad S $
$(I)$ They have high melting points, higher than those of pure metals
$(II)$ They are very hard
$(III)$ They retain metallic conductivity
$(IV)$ They are chemically more reactive than the pure metals