Incorrect statement regarding the compounds of alkali metals is

• A

  ${\mathrm{Na}}_2{\mathrm{CO}}_3$is prepared by solvay-ammonia process

• B

  Solubility of $\mathrm{NaCl}$is almost unaffected by change in temperature

• C

  ${\mathrm{Li}}_2{\mathrm{CO}}_3$decomposes on heating

• D

  $\mathrm{NaOH}$is effloroscent