# Hydrogen and it's compounds!

Chemistry Level 4

Which of the following statements are correct?

1. Hydrogen constitutes 70% of the mass of earth's crust.

2. In hydrated $$\ce {CuSO4}$$ ,only one molecule of water is present as interstitial water , rest 4 are in co-ordination.

3. Size of $$H^+$$ is $$1.5 × {10}^{-3} pm$$ which is exceptionally high.

4. Tritium is Radioactive which emits low energy $$\alpha$$ particles ( $${t}_{\frac {1}{2}} = 12.33 yrs )$$.

5. The reaction of $$CO$$ with steam in presence of iron peroxide gives $${CO}_{2}$$ and $${H}_{2}$$ and is called water gas shift reaction.

6. $${H}_{2}$$ is insoluble in water.

7. Cerium hydride has lattice different from parent metal.

8. Ice crystallises to cubic form at atmospheric temperature and condenses to hexagonal form at very low temperature

9. Magnesium hydrogen Carbonate on boiling gives Magnesium Carbonate.

10. Hydrogen peroxide has a planar structure .

Enter your answer as the product of the correct option numbers .

Clarification If 2, 3, 5 are correct then enter answer as 2 × 3 × 5 = 30.

This is part of my set Inorganic Fun

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