Match the following compounds with their respective uses:
Compound Uses
$1. CaCO_3$ $a.$ In purification of coal gas
$2. Ca(OH)_2$ $b.$ As an antacid
$3. CaO$ $c.$ In paper and textile industries
$4. Na_2CO_3 \cdot 10H_2O$ $d.$ In glass and leather industries

  • A
    $1-a, 2-b, 3-c, 4-d$
  • B
    $1-b, 2-c, 3-a, 4-d$
  • C
    $1-b, 2-d, 3-a, 4-c$
  • D
    $1-c, 2-a, 3-d, 4-b$

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Compound Percentage proportion
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$2. Al_2O_3$ $a. 5-10\%$
$3. SO_3$ $b. 1-3\%$

An aqueous solution of a colourless metal sulphate $M$ gives a white precipitate with $NaOH$. This precipitate is soluble in excess of $NaOH$. On passing $H_2S$ through this solution,a white precipitate is formed. The metal $M$ in the salt is:

On heating anhydrous $Na_2CO_3$,........ is evolved.

Calcium cyanamide on treatment with steam produces:

Which of the following orders are correct?
$(I)$ Thermal stability: $BeSO_4 < MgSO_4 < CaSO_4 < SrSO_4$
$(II)$ Basic nature: $ZnO > BeO > MgO > CaO$
$(III)$ Solubility in water: $LiOH > NaOH > KOH > RbOH$
$(IV)$ Melting point: $NaCl > KCl > RbCl > CsCl > LiCl$

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