Properties of Water

Q.

Temporary hardness of water is due to the presence of

1. Magnesium bicarbonate
2. Calcium chloride
3. Magnesium sulphate
4. Calcium carbonate

Q. Assertion (A):The temperature at which vapour pressure of a liquid equal to the external pressure is called boiling temperature.
Reason (R): At high altitude atmospheric pressure is high.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Q. Match the following hydrates with the type of water involved.

1. Co-ordinated water
2. Hydrogen bond water
3. Interstitial water

Q.

The molarity of pure water at $4^{\circ }C$ is

1. 2.5 M

2. 5 M

3. 1 M

4. 55.5 M

Q. Nature of water is

1. basic
2. acidic
3. amphoteric

Q. What is the pH of $5\times {10}^{-8}NHCl?$

1. 6.5
2. 5.5
3. 5.95
4. 6.95

Q.

The critical temperature of water is higher than that of $O_2$ because $H_{2}O$ molecule has

1. Two covalent bonds

2. V-shape

3. Fewer electrons than oxygen

4. Dipole moment

Q. Systematic name of $H_2$O is

1. Water
2. Dihydrogen oxide
3. Oxidane
4. Oxygen dehydrate

Q. Proton is likely to have high

1. Hydration energy
2. Electron affinity
3. Atomic size
4. Atomic mass

Q. Nature of water is

1. basic
2. acidic
3. amphoteric

Q. Choose the correct option from the following :

1. Due to vacant space in ice molecule its density is lower than water
2. Both (a) and (b) are correct
3. Both (a) and (b) are incorrect
4. In ice molecule, oxygen is tetrahedrally surrounded by four hydrogen atom

Q. Choose the correct statement from the followings

1. Water molecule can coordinate to metal ion to form complex compound.
2. Water molecule can bond to oxygen to form oxo-anion.
3. Water molecules can occupies interstitial sites in crystal lattice
4. $H_{2}O$ is more reactive than $D_{2}O$ due to isotopic effect

Q. The pH of $1MP{O}_4^{3-}$ (aq) solution is:
[Given $p{K}_b\left(P{O}_4^{3-}\right)=1.62]$

1. 13.19
2. 1.62
3. 8.1
4. 4.86

Q. The weight percentage of deuterium in heavy water is:

1. 20
2. 11.11
3. 4
4. 22

Q. Which of the following statements is incorrect?

1. Water is amphoteric
2. Water acts as an oxidizing agent
3. Water acts as a reducing agent
4. Sodium hydride is insoluble in water

Q. The weight percentage of deuterium in heavy water is:

1. 20
2. 11.11
3. 4
4. 22

Q.

Glass is soluble in

1. $HF$
2. $H_{2}S{O}_4$
3. $HCl{O}_4$
4. aqua-regia

Q. Choose the given reaction(s) in which water act as an oxidising agent.

1. $Mg+2H_{2}O\to Mg(OH{)}_2+H_2$
2. $Ca{H}_2+2H_{2}O\to Ca(OH{)}_2+2H_2$
3. $2F_2+2H_{2}O\to 4HF+O_2$
4. $2Na+2H_{2}O\to 2NaOH+H_2$

Q. Hydrogen can be obtained from water, by the action of water on

1. Calcium carbide
2. Calcium hydride
3. Calcium oxide
4. Calcium

Q.

Given that the partial vapour pressure of water is 611.657 Pa. The triple point of water is

1. 273.16K

2. 373.15K

3. 203.12K

4. 193.16K

Q.

Hydrogen is evolved by the action of cold dil. $HN{O}_3$ on

1. Fe

2. Mn

3. Cu

4. Al

Q.

The Hybridisation of O atom in $H_{2}O$ is

1. $sp$

2. $s{p}^3$

3. $ds{p}^2$

4. Neither oxygen nor hydrogen are hybridized