Atomic hydrogen combines with almost all...

Atomic hydrogen combines with almost all elements but molecular hydrogen does not. Explain.

Text Solution

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Atomic hydrogen is highly unstable and hence it is very reactive. Its electronic configuration is `1s^1`. For stability it accept 1 more electron and thus it almost combine with all the elements.
Atomic hydrogen make hydride by three different type.
(i) If remove one electron and form `H^+`
(ii) It accept one electron and form `H^-`
(iii) It share one electron and form covalent single bond. In contrast, the bond dissocia tion energy of H-H bond is very high (435.88 kJ `"mol"^(-1)`). As a result molecular hy drogen is almost inert at room temp. and hence reacts only with a few elements.

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Assertion : Hydrogen atom is combine with other element by exchange and sharing of electron. Reason : Hydrogen can be form electrovalent or covalent bond with other elements.

Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)

Both (A) and (R) are true but (R) is not the correct explanation of (A)

(A) is true but (R) is false

(A) and (R) both are false.

Atomic radius of hydrogen atom H in Bohr.s model is

`0.529 xx 10^(7) cm`

`0.529 xx 1 0^(9) cm`

`0.529 xx 10^(8) cm`

`0.529 xx 10^(10) cm`

Which of the following is false for molecular mass of hydrogen ?

2 g

`6.022 xx 10^(23)` hydrogen atoms

`6.022 xx 10^(23)` hydrogen molecules

1 mole hydrogen