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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Permanent hardness of water is due to the presence of

(i) Chlorides of Ca and Mg in water

(ii) Sulphates of Ca and Mg in water

(iii) Hydrogen carbonates of Ca and Mg in water

(iv) Carbonates of alkali metals in water

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Important Questions on Hydrogen

EASY

Chemistry>Inorganic Chemistry>Hydrogen>Hardness of Water and Methods of Removing Hardness

Treatment with lime can remove hardness of water caused by

EASY

Chemistry>Inorganic Chemistry>Hydrogen>Hardness of Water and Methods of Removing Hardness

The temporary hardness of water is due to:

EASY

Chemistry>Inorganic Chemistry>Hydrogen>Hardness of Water and Methods of Removing Hardness

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

EASY

Chemistry>Inorganic Chemistry>Hydrogen>Hardness of Water and Methods of Removing Hardness

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

EASY

Chemistry>Inorganic Chemistry>Hydrogen>Hardness of Water and Methods of Removing Hardness

Permanent hardness in water cannot be cured by:

EASY

Chemistry>Inorganic Chemistry>Hydrogen>Hardness of Water and Methods of Removing Hardness

Which of the following ions will cause hardness in water?

MEDIUM

Chemistry>Inorganic Chemistry>Hydrogen>Hardness of Water and Methods of Removing Hardness

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

MEDIUM

Chemistry>Inorganic Chemistry>Hydrogen>Hardness of Water and Methods of Removing Hardness

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

EASY

Chemistry>Inorganic Chemistry>Hydrogen>Hardness of Water and Methods of Removing Hardness

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:

MEDIUM

Chemistry>Inorganic Chemistry>Hydrogen>Hardness of Water and Methods of Removing Hardness

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

MEDIUM

Chemistry>Inorganic Chemistry>Hydrogen>Hardness of Water and Methods of Removing Hardness

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:

EASY

Chemistry>Inorganic Chemistry>Hydrogen>Hardness of Water and Methods of Removing Hardness

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

EASY

Chemistry>Inorganic Chemistry>Hydrogen>Hardness of Water and Methods of Removing Hardness

Permanent hardness cannot be removed by

EASY

Chemistry>Inorganic Chemistry>Hydrogen>Hardness of Water and Methods of Removing Hardness

Permanent hardness of water can be removed by

MEDIUM

Chemistry>Inorganic Chemistry>Hydrogen>Hardness of Water and Methods of Removing Hardness

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

MEDIUM

Chemistry>Inorganic Chemistry>Hydrogen>Hardness of Water and Methods of Removing Hardness

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

MEDIUM

Chemistry>Inorganic Chemistry>Hydrogen>Hardness of Water and Methods of Removing Hardness

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

EASY

Chemistry>Inorganic Chemistry>Hydrogen>Hardness of Water and Methods of Removing Hardness

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

MEDIUM

Chemistry>Inorganic Chemistry>Hydrogen>Hardness of Water and Methods of Removing Hardness

The hardness of a water sample containing

10^{- 3} M {M g S O}_{4}

expressed as

{C a C O}_{3}

equivalents (in

p p m

) is . (molar mass of

{M g S O}_{4}

120.37 g / m o l

)

MEDIUM

Chemistry>Inorganic Chemistry>Hydrogen>Hardness of Water and Methods of Removing Hardness

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})

Permanent hardness of water is due to the presence of (i) Chlorides of Ca and Mg in water (ii) Sulphates of Ca and Mg in water (iii) Hydrogen carbonates of Ca and Mg in water (iv) Carbonates of alkali metals in water

Important Questions on Hydrogen

Learn and Prepare for any exam you want !

Permanent hardness of water is due to the presence of

(i) Chlorides of Ca and Mg in water

(ii) Sulphates of Ca and Mg in water

(iii) Hydrogen carbonates of Ca and Mg in water

(iv) Carbonates of alkali metals in water