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Which of the following is incorrect? 1...

Which of the following is incorrect?
1) Hydrogen forms covalent hydrides with most p-block elements
2) Hydrides of group-13 are electron rich
3) Metallic hydrides obey law of constant proportions
4) Metallic hydrides are used in catalytic reduction
5) Ni, Pt and Pd absorb very low volume hydrogen (a) 2 and 3 (b) 1,2 and 3 (c) 2,4, and 5 (d) 2,3,and 5

A

2 and 3

B

1, 2 and 3

C

2, 4 and 5

D

2, 3 and 5

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