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21
MCQ (Single Correct Answer)

Dehydration of hydrates of halides of calcium, barium and strontium i.e., $\mathrm{CaCl}_2 \cdot 6 \mathrm{H}_2 \mathrm{O}, \mathrm{BaCl}_2 \cdot 2 \mathrm{H}_2 \mathrm{O}, \mathrm{SrCl}_2 \cdot 2 \mathrm{H}_2 \mathrm{O}$, can be achieved by heating. These become wet on keeping in air. Which of the following statements is correct about these halides?

A
Act as dehydrating agent
B
Can absorb moisture from air
C
Tendency to form hydrate decreases from calcium to barium
D
All of the above
22
MCQ (Multiple Correct Answer)

Metallic elements are described by their standard electrode potential, fusion enthalpy, atomic size, etc. The alkali metals are characterised by which of the following properties?

A
High boiling point
B
High negative standard electrode potential
C
High density
D
Large atomic size
23
MCQ (Multiple Correct Answer)

Several sodium compounds find use in industries. Which of the following compounds are used for textile industry?

A
$\mathrm{Na}_2 \mathrm{CO}_3$
B
$\mathrm{NaHCO}_3$
C
NaOH
D
NaCl
24
MCQ (Multiple Correct Answer)

Which of the following compounds are readily soluble in water?

A
$\mathrm{BeSO}_4$
B
$\mathrm{MgSO}_4$
C
$\mathrm{BaSO}_4$
D
$\mathrm{SrSO}_4$
25
MCQ (Multiple Correct Answer)

When zeolite, which is hydrated sodium aluminium silicate is treated with hard water, the sodium ions are exchanged with which of the following ion(s)?

A
$\mathrm{H}^{+}$ ions
B
$\mathrm{Mg}^{2+}$ ions
C
$\mathrm{Ca}^{2+}$ ions
D
$\mathrm{SO}_4^{2-}$ ions
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