Select the correct statement from the following.

  • A
    The solubility of alkali hydroxides follows the order: $LiOH < NaOH < KOH < RbOH$.
  • B
    The solubility of alkali carbonates follows the order: $Li_2CO_3 < Na_2CO_3 < K_2CO_3 < Rb_2CO_3$.
  • C
    Both are correct.
  • D
    None of the above.

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Among the following,the number of metals that can be used as electrodes in a photoelectric cell is $.......$ (Integer answer)
$A. Li$
$B. Na$
$C. Rb$
$D. Cs$

Which of the following statements is correct?

All the $s$-block elements of the periodic table are placed in the groups...

The oxide of $Cs$ is:

Write down the biological importance of $Na$ and $K$ in the human body and give a brief note on the sodium-potassium pump.

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