Preparation of Dioxygen

Q.

Magnesium metal reacts with Oxygen to form ________

Q.

When electricity is passed through acidified water, it decomposes to give hydrogen and carbon dioxide.

1. True
2. False

Q.

$2{\mathrm{NaNO}}_3+10\mathrm{Na}\to \mathrm{\_\_\_\_\_\_\_\_\_\_\_\_\_\_}+{\mathrm{N}}_2$

$2{\mathrm{NaNO}}_2+6\mathrm{Na}\to \mathrm{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}+{\mathrm{N}}_2$

The Product Obtained is as Follows:

Q. The correct set of four quantum numbers for the valence electron of sodium atom is

सोडियम परमाणु के संयोजी इलेक्ट्रॉन के लिए चारों क्वाण्टम संख्याओं का सही समुच्चय है

	n	$\ell$	ml	ms
(1)	4	0	0	$+\frac{1}{2}$
(2)	3	1	–1	$+\frac{1}{2}$
(3)	2	1	+1	$+\frac{1}{2}$
(4)	3	0	0	$+\frac{1}{2}$

1. (1)
2. (2)
3. (3)
4. (4)

Q.

Briefly describe how water reacts with sodium oxide stating the experimental condition and write the balanced chemical equations.

Q. The following reaction is used for the preparation of oxygen gas in the laboratory.
$2KCl{O}_3\left(s\right)\underset{Catalyst}{\overset{Heat}{\to }}2KCl\left(s\right)+3O_2\left(g\right)$
Which of the following statement is correct about the reaction?

1. It is a decomposition reaction and endothermic in nature
2. It is a combination reaction
3. It is a decomposition reaction and accompanied by release of heat
4. It is a photochemical decomposition reaction and exothermic in nature

Q.

Identify the gas evolved and give the chemical test when sodium nitrite is heated with ammonium chloride?

Q.

Name a white insoluble oxide that dissolves in hot and concentrated caustic alkali.

Q. Assertion :In the extraction of aluminium by electrolysis it is necessary to renew the anode periodically. Reason: Oxygen gas is formed and at high temperature of the electrolysis cell it burns and oxidises away the carbon electrodes to form toxic carbon monoxide or carbon dioxide

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q.

Complete the following reaction:

${\mathrm{SO}}_2+{\mathrm{O}}_2\underset{450-500°\mathrm{C}}{\overset{{\mathrm{V}}_2{\mathrm{O}}_5}{\rightleftharpoons }}$

Q.

Oxygen is not evolved when:

1. Potassium chlorate is heated with $Mn{O}_2$ catalyst.

2. Sodium peroxide reacts with water

3. Ammonium nitrate is heated

4. Zinc oxide is treated with $NaOH$