Among the following, the number of metal/s which can be used as electrodes in the photoelectric cell is:
(a) Li
(b) Na
(c) Rb
(d) Cs

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Solution

Cs is used in photoelectric cell due to its very low ionization potential

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L i N a R b C s

The correct order of reactivity of alkalimetals towards $H_{2}$ is

Arrange the following as per instructions given in the brackets.

(a) Mg. Cl, Na, S, Si (decreasing order of atomic size)

(b) Cs, Na, Li, K, Rb (increasing metallic character)

(d) Cl, F, Br, I (increasing electron affinity)

(e) Cs, Na, Li, K, Rb (decreasing electronegativity)

The order of decreasing ionisation enthalpy in alkali metals is
(a) Na> Li > K> Rb (b) Rb< Na< K< Li
(c) Li > Na> K> Rb (d) K< Li < Na < Rb

C s, N a, L i, K, R b

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