Hydrogen is similar to alkali metals in that it has a ionisation enthalpy.

high

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low

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moderate

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Solution

The correct option is B low
Ionisation energy refers to the energy required to remove an electron from the outermost shell of an atom.

All the alkali metals have a low value of ionisation energy . It has only one electron in the outermost shell and to attain stability it tends to lose the electron easily.

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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 is similar to alkali metals in terms of:

Q. A hydrogen is similar to alkali metals as it forms halides with the formula .

Q. Hydrogen is placed in group - I as it shows similarities in properties with alkali metals (Li, Na, K, etc.). Identify such similar properties between Hydrogen (H) and Alkali metals (M).

Q. Assertion :Among hydroxides of a alkali metals, LiOH is the weakest base. Reason: Among alkali metals, lithium has the highest ionisation energy.

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