Which among the following statements is $NOT$ true?

  • A
    Compounds of unipositive ions of alkali metals are paramagnetic.
  • B
    Alkali metals have low density.
  • C
    All alkali metals are silvery white and soft.
  • D
    Alkali metals are most electropositive elements.

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Match the following:
Metals Ore
$1$. Barium $d$. Witherite
$2$. Magnesium $a$. Carnallite
$3$. Potassium $b$. Sylvine
$4$. Strontium $c$. Celestine

Observe the following statements:
Statement-$I$: Both $LiF$ and $CsI$ have low solubility in water.
Statement-$II$: Low solubility of $LiF$ in water is due to its high lattice enthalpy,and that of $CsI$ is due to its smaller hydration enthalpy of ions.

When sodium $(Na)$ metal is dissolved in liquid ammonia $(NH_3)$,it imparts a blue colour to the solution. This blue coloration is due to:

Two alkali halide salts,$ACl$ and $BCl$,gave crimson red and violet colors in their flame tests,respectively. $A$ and $B$ are respectively:

Write balanced equations for reactions between
$(a)$ $Na_{2}O_{2}$ and water
$(b)$ $KO_{2}$ and water
$(c)$ $Na_{2}O$ and $CO_{2}$

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