Give reasons why hydrogen resembles alkali metals?

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Solution

Hydrogen resembles alkali metals because of following reasons

(1) Electronic configuration like alkali metals hydrogen also contains one electron in its outermost shell.

(2) Electropositive configuration: Tt can lose one electron to form $H^{+}$ ion like alkali metals.

(3) Liberation at carthode when an aqueous solution of HCl is electrolysed, $H_{2}$ is liberated at cathode in the same way as alkali metals are liberated at cathode during the electrolysis of their fused halide.

(4) Oxidation state: It shows +1 oxidation state like alkali metals.

(5) Reducing character: Hydrogen is a strong reducing agent like other alkali metals.

$C u O + H_{2} \to C u + H_{2} O$

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Question 2

Why does $H^{+}$ ion always get associated with other atom or molecules?

(a) Ionisation enthalpy of hydrogen resembles that of alkali metals.

(b) Its reactivity is similar to halogens

(d) Loss of an electron from hydrogen atom results in a nucleus of very small size as compare to other or ions. Due to small size it cannot exist free.

Q. Hydrogen resembles alkali metals because:

Q. Hydrogen does not resemble alkali metals in which one of the following properties?

Q. Assertion :Hydrogen resembles both, alkali metals as well as halogens. Reason: Hydrogen forms oxides, halides and sulphides, and exists as diatomic molecule.

Assertion (A): Hydrogen resembles alkali metals.
Reason (R): Hydrogen exists in atomic form at extreme temperatures (~5000K).
Choose the most appropriate of the following:

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