Match the following and identify the correct option. (a) CO g + H 2 g (i) Mg HCO 3 2 + Ca HCO 3 2 (b) Temporary hardness of water (ii) An electron deficient hydride (c) B 2 H 6 (iii) Synthesis gas (d) H 2 O 2 (iv) Non-planar structure

(a)-(iii); (b)-(i); (c)-(ii); (d)-(iv)

(a)-(iii); (b)-(ii); (c)-(i); (d)-(iv)

(a)-(iii); (b)-(iv); (c)-(ii); (d)-(i)

(a)-(i); (b)-(iii); (c)-(ii); (d)-(iv)

EASY

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In Clark's process for removing hardness of water, the reagent used is

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Important Questions on Water

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Science>Chemistry>Water>Hardness of Water

Permanent hardness of water can be removed by

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Science>Chemistry>Water>Hardness of Water

The temporary hardness of water is due to:

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Science>Chemistry>Water>Hardness of Water

Treatment with lime can remove hardness of water caused by

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Science>Chemistry>Water>Hardness of Water

Given below are two statements: One is labelled as Assertion A and the other labelled as reason $R$

Assertion $A :$ During the boiling of water having temporary hardness, $Mg {({HCO}_{3})}_{2}$ is converted to ${MgCO}_{3}$

Reason $R :$ The solubility product of $Mg (OH)_{2}$ is greater than that of ${MgCO}_{3}$ .

In the light of the above statements, choose the most appropriate answer from the options given below:

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Science>Chemistry>Water>Hardness of Water

What is the hardness of a water sample

(

in terms of equivalents of

{CaCO}_{3})

containing

10^{- 3} M {CaSO}_{4}

(

Molar mass of

{CaSO}_{4} = 136 g {mol}^{- 1})

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Science>Chemistry>Water>Hardness of Water

Calgon is used for water treatment. Which of the following statement is NOT true about Calgon?

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Science>Chemistry>Water>Hardness of Water

When soap is dissolved in hard water, its cleaning ability comes down. This is due to the formation of:

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Science>Chemistry>Water>Hardness of Water

Which compound among the following is used to remove the hardness of water ?

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Science>Chemistry>Water>Hardness of Water

In comparison to the zeolite process for the removal of permanent hardness, the synthetic resin method is

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Science>Chemistry>Water>Hardness of Water

The one that is NOT suitable for the removal of permanent hardness of water is :

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Science>Chemistry>Water>Hardness of Water

Permanent hardness cannot be removed by

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Science>Chemistry>Water>Hardness of Water

The method used to remove the temporary hardness of water is:

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Science>Chemistry>Water>Hardness of Water

Which one of the following methods is most suitable for preparing deionized water?

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Science>Chemistry>Water>Hardness of Water

Which of the following ions will cause hardness in water?

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Science>Chemistry>Water>Hardness of Water

The major products during the removal of temporary hardness of water are

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Science>Chemistry>Water>Hardness of Water

The metal salts formed during softening of hardwater using Clark's method are

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Science>Chemistry>Water>Hardness of Water

Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonate to

MEDIUM

Science>Chemistry>Water>Hardness of Water

Match the following and identify the correct option.

(a) $CO (g) + H_{2} (g)$	(i) $Mg {({HCO}_{3})}_{2} + Ca {({HCO}_{3})}_{2}$
(b) Temporary hardness of water	(ii) An electron deficient hydride
(c) $B_{2} H_{6}$	(iii) Synthesis gas
(d) $H_{2} O_{2}$	(iv) Non-planar structure

EASY

Science>Chemistry>Water>Hardness of Water

The temporary hardness of a water sample is due to compound

X .

Boiling this sample converts

X

to compound

Y .

X

and

Y,

respectively, are:

EASY

Science>Chemistry>Water>Hardness of Water

Permanent hardness in water cannot be cured by:

In Clark's process for removing hardness of water, the reagent used is

Important Questions on Water

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