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Q.

Suppose a gas mixture of He, Ne, Ar and Kr is irradiated with photons of the frequency appropriate to ionise Ne. What ions will be present in the mixture?

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a

${He}^{+}$ only

b

${Ne}^{+}$ only

c

${He}^{+}, {Ne}^{+}, {Ar}^{+}$ only

d

${Ne}^{+}, {Kr}^{+}, {Ar}^{+}$ only

answer is D.

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Detailed Solution

As we go down the group $I E ↓$

Hence, He will not ionise.

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