The alkali metal widely used in photo electric cells is:

K

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R b

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C s

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N a

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Solution

The correct option is C $C s$
This is because of the lowest ionisation enthalpy of $C s$ because of its largest size, valence electrons can be easily ejected out and thus it is widely used in photoelectric effect.

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Similar questions

Q. The mobilities of the alkali metal ions in aqueous solution are

L i^{+} < N a^{+} < K^{+} < R b^{+} < C s^{+}

because :

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

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

Q. The mobility of metal ions in aqueous medium

(L i^{\oplus}, N a^{\oplus}, K^{\oplus}, R b^{\oplus})

in an electric field, follows the order:

The alkali metals are low melting . Which of the following alkali metal is expected to melt if the room temperature rises to $30^{\circ}$ C?
(a) Na (b) K (c) Rb (d) Cs

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The alkali metal widely used in photo electric cells is:

The correct option is C CsThis is because of the lowest ionisation enthalpy of Cs because of its largest size, valence electrons can be easily ejected out and thus it is widely used in photoelectric effect.

The correct option is C $C s$
This is because of the lowest ionisation enthalpy of $C s$ because of its largest size, valence electrons can be easily ejected out and thus it is widely used in photoelectric effect.