Chemistry>Inorganic Chemistry>The s-Block Elements>Some Important Compounds of Calcium

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The melting point of calcium oxide is $3870 K$ .

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Important Questions on The s-Block Elements

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Chemistry>Inorganic Chemistry>The s-Block Elements>Some Important Compounds of Calcium

What is the commercial name for calcium oxide?

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Chemistry>Inorganic Chemistry>The s-Block Elements>Some Important Compounds of Calcium

Dead burnt plaster is

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Chemistry>Inorganic Chemistry>The s-Block Elements>Some Important Compounds of Calcium

Match List $- I$ with List $- II$

	List $- I$		List $- II$
(a)	$Ca (OCl)_{2}$	(i)	Antacid
(b)	${CaSO}_{4} \cdot \frac{1}{2} H_{2} O$	(ii)	Cement
(c)	$CaO$	(iii)	Bleach
(d)	${CaCO}_{3}$	(iv)	Plaster of paris

Choose the most appropriate answer from the

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Chemistry>Inorganic Chemistry>The s-Block Elements>Some Important Compounds of Calcium

Which of the reactions represents "slaking of lime"?

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Chemistry>Inorganic Chemistry>The s-Block Elements>Some Important Compounds of Calcium

The suspension of slaked lime in water is known as

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Chemistry>Inorganic Chemistry>The s-Block Elements>Some Important Compounds of Calcium

Match the following compounds (Column-I) with their uses (Column-II)

S. No.	Column-I	S.No.	Column-II
(I)	$Ca {(OH)}_{2}$	(A)	casts of statues
(II)	$NaCl$	(B)	white wash
(III)	${CaSO}_{4} \cdot \frac{1}{2} H_{2} O$	(C)	antacid
(IV)	${CaCO}_{3}$	(D)	washing soda preparation

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Chemistry>Inorganic Chemistry>The s-Block Elements>Some Important Compounds of Calcium

Match list-I with list-II :


(a)	$Be$	(i)	Treatment of cancer
(b)	$Mg$	(ii)	Extraction of metals
(c)	$Ca$	(iii)	Incendiary bombs and signals
(d)	$Ra$	(iv)	Windows of X-ray tubes
		(v)	Bearings for motor engines.

Choose the most appropriate answer, the option given below :

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Some Important Compounds of Calcium

The correct order of thermal stability of hydroxides is

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Chemistry>Inorganic Chemistry>The s-Block Elements>Some Important Compounds of Calcium

The covalent alkaline earth metal halide

(X = C l, B r, I)

is:

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Chemistry>Inorganic Chemistry>The s-Block Elements>Some Important Compounds of Calcium

Which of the following is an amphoteric hydroxide?

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Chemistry>Inorganic Chemistry>The s-Block Elements>Some Important Compounds of Calcium

Calcite crystals used in Nicol's prism are formed of

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Chemistry>Inorganic Chemistry>The s-Block Elements>Some Important Compounds of Calcium

The electronegativity of aluminum is similar to:

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Chemistry>Inorganic Chemistry>The s-Block Elements>Some Important Compounds of Calcium

Complete the following reaction:

Ca {(OH)}_{2} + {Cl}_{2} \to

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Chemistry>Inorganic Chemistry>The s-Block Elements>Some Important Compounds of Calcium

When gypsum is heated to

393 K,

it forms:

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Chemistry>Inorganic Chemistry>The s-Block Elements>Some Important Compounds of Calcium

Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy?

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Chemistry>Inorganic Chemistry>The s-Block Elements>Some Important Compounds of Calcium

The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel harder by converting

[3 {Ca}_{3} {({PO}_{4})}_{2} . Ca {(OH)}_{2}]

to:

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Chemistry>Inorganic Chemistry>The s-Block Elements>Some Important Compounds of Calcium

The solubility of the alkaline earth's metal sulphates in water decreases in the sequence:

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Chemistry>Inorganic Chemistry>The s-Block Elements>Some Important Compounds of Calcium

The structures of beryllium chloride in the solid state and vapour phase, respectively, are:

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Chemistry>Inorganic Chemistry>The s-Block Elements>Some Important Compounds of Calcium

On heating which of the following releases

C O_{2}

most easily?

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Some Important Compounds of Calcium

The conversion of hydroxyapatite occurs due to presence of

F^{-}

ions in water. The correct formula of hydroxyapatite is: