Q: Which of the following process is not used in the concentration of \$H_{2}O_{2}\$?

Sublimation is not involved in concentration of \$H_{2}O_{2}\$.Concentration of Hydrogen peroxide involves the following steps:1. Evaporation of solution to obtain \$30\%\$ solution.2. Distillation under pressure to get \$90\%\$ pure solution.3. Fractional Distillation to get \$100\%\$ pure \$H_{2}O_{2}\$.

Q: Which of the following gas is lightest?

Dihydrogen \$(H_2)\$ is the lightest gas as it is having two atoms of hydrogen, its molecular weight would be approximately \$2\$. And remaining atoms are having more than two I.e., \$4, 28, 32\$ for \$He, N_2, O_2\$ respectively.

Q: The boiling point of water is :

The boiling point of water is \$100^{\circ}C\$.This is because upto 100\$^{\circ}\$C water can increase it's temperature but after 100\$^{\circ}\$C it starts to change its state(i.e, from liquid to vapour) rather than to increase its temperature. Hence, the boiling point of water is 100\$^{\circ}\$C.

Q: \$H_2\$ does not show litmus test. From this, we can say, that the oxide of hydrogen is _______ in nature.

\${ H }_{ 2 }\$ does not affect litmus paper as it is neutral. If it would have been acidic then it would have turn blue litmus red or if basic then vice-versa.

Question 1

Which of the following process is not used in the concentration of $H_{2}O_{2}$?

Accepted Answer

Sublimation is not involved in concentration of $H_{2}O_{2}$.Concentration of Hydrogen peroxide involves the following steps:1. Evaporation of solution to obtain $30\%$ solution.2. Distillation under pressure to get $90\%$ pure solution.3. Fractional Distillation to get $100\%$ pure $H_{2}O_{2}$.

Question 2

As oxygen is ______ soluble in water. Air dissolved in water contains a higher percentage of oxygen (30-35%) than ordinary air (21%).

Accepted Answer

Air dissolved in water contains higher percentage of oxygen because solubility of oxygen gas is more than nitrogen and other gases present in ordinary air. Since the size of oxygen molecules is such that it gets trapped in the vacant space of water molecules (formed due to hydrogen bonding).Therefore option B is correct

Question 3

Which of the following gas is lightest?

Accepted Answer

Dihydrogen $(H_2)$ is the lightest gas as it is having two atoms of hydrogen, its molecular weight would be approximately $2$. And remaining atoms are having more than two I.e., $4, 28, 32$ for $He, N_2, O_2$ respectively.

Question 4

The boiling point of water is :

Accepted Answer

The boiling point of water is $100^{\circ}C$.This is because upto 100$^{\circ}$C water can increase it's temperature but after 100$^{\circ}$C it starts to change its state(i.e, from liquid to vapour) rather than to increase its temperature. Hence, the boiling point of water is 100$^{\circ}$C.

Question 5

$H_2$ does not show litmus test. From this, we can say, that the oxide of hydrogen is _______ in nature.

Accepted Answer

${ H }_{ 2 }$ does not affect litmus paper as it is neutral. If it would have been acidic then it would have turn blue litmus red or if basic then vice-versa.

Question 6

When water is cooled it contracts until it reaches __________ and then it starts expanding.

Accepted Answer

Lowering of a temperature of water reduces the translation motion and thus brings the molecules closer. This is apparent in the contraction of water upon cooling. But at $4^{ \circ }C$, the water molecules form extensive hydrogen bonding. As a result, each water molecules is surrounded by four molecules and this increases the vacant space between the molecules. This results in expansion of the system.option D is correct.

Question 7

Water is a ______ oxide.

Accepted Answer

Water is a neutral oxide because it does not show any change in the colour of litmus paper.

Question 8

Distilled water though pure, is not preferred to drink due to its flat insipid taste.

Accepted Answer

There is nothing wrong with drinking distilled water (and deionised water ) other than it tastes ''flat'', this is not surprising since it is 100% pure $H_2O$ with no minerals. Option A is correct

Question 9

Concentration of $H_{2}O_{2}$ by vacuum distillation gives hydrogen peroxide which is:

Accepted Answer

Vacuum distillation avoids decomposition of peroxide and gives crystalline $H_2O_2$ with negligible amount of impurities.

Question 10

Electronic configuration of deuterium is _________.

Accepted Answer

Hydrogen has one proton and no neutron. Its atomic number is one and the electronic configuration is $1s^1$.Deuterium has one neutron and one proton. The mass number of deuterium is $2$. Its electronic configuration is the same as that of hydrogen, $1s^1$ as it is an isotope of hydrogen.

Hydrogen

Chemistry
4661 Views

Which of the following process is not used in the concentration of $H_{2} O_{2}$ ?

As oxygen is ______ soluble in water. Air dissolved in water contains a higher percentage of oxygen (30-35%) than ordinary air (21%).

Which of the following gas is lightest?

The boiling point of water is :

$H_{2}$ does not show litmus test. From this, we can say, that the oxide of hydrogen is _______ in nature.

When water is cooled it contracts until it reaches __________ and then it starts expanding.

Water is a ______ oxide.

Distilled water though pure, is not preferred to drink due to its flat insipid taste.

Concentration of $H_{2} O_{2}$ by vacuum distillation gives hydrogen peroxide which is:

Electronic configuration of deuterium is _________.

Hydrogen

Chemistry 4661 Views

Which of the following process is not used in the concentration of H2​O2​?

As oxygen is ______ soluble in water. Air dissolved in water contains a higher percentage of oxygen (30-35%) than ordinary air (21%).

Which of the following gas is lightest?

The boiling point of water is :

H2​ does not show litmus test. From this, we can say, that the oxide of hydrogen is _______ in nature.

When water is cooled it contracts until it reaches __________ and then it starts expanding.

Water is a ______ oxide.

Distilled water though pure, is not preferred to drink due to its flat insipid taste.

Concentration of H2​O2​ by vacuum distillation gives hydrogen peroxide which is:

Electronic configuration of deuterium is _________.

Chemistry
4661 Views

Which of the following process is not used in the concentration of $H_{2} O_{2}$ ?

$H_{2}$ does not show litmus test. From this, we can say, that the oxide of hydrogen is _______ in nature.

Concentration of $H_{2} O_{2}$ by vacuum distillation gives hydrogen peroxide which is: