Reaction with Oxygen

Q. A metal Nitrate 'A' on heating gives yellowish brown coloured metal oxide along with brown gas 'B' and a colourless gas 'C'. Aqueous solution of 'A' on reaction with potassium iodide forms a yollow precipitate of compound 'D'.Identify A, B, C, D.Also identify the type of both the reactions.

Q.

What happens when hydrogen chloride gas is dissolved in water?

Q.

What happens when zinc nitrate is strongly heated?

1. Zinc oxide is formed

2. None of these

3. Zinc nitrite is formed

4. Zinc hydroxide is formed

Q.

Name :

(a) a nitrate of metal which on heating does not give nitrogen dioxide.

(b) a nitrate which on heating leaves no residue behind.

(c) a metal nitrate which on heating is changed into metal oxide.

(d) a metal nitrate which on heating is changed into metal.

(e) a solution which absorbs nitric oxide.

(f) the oxide of nitrogen which turns brown on exposure to air. How is it prepared ?

Q.

The only product of the combustion of Hydrogen in the air is water.

1. True
2. False

Q.

Give reasons for the following :

(a) Liquid ammonia is used as a refrigerant in ice plants.

(b) Aqueous solution of ammonia is used for removing grease stains from woollen clothes.

(c) Aqueous solution of ammonia gives a pungent smell.

(d) Aqueous solution of ammonia conducts electricity.

Q.

What are thermochemical equations?

Q. Which among the following statement(s) is/are true?
Exposure of silver of silver chloride to sunlight for a long duration turns grey due to:
(1) Formation of silver by decomposition of silver chloride.
(2) Sublimation of silver chloride
(3) Decomposition of chlorine gas from silver chloride
(4) Oxidation of silver chloride

1. $1\text{Only}$
2. $1\text{and}3$
3. $2\text{and}3$
4. $4\text{Only}$

Q.

In the presence of platinum at ${800}^{0}C$ , ammonia reacts with oxygen to give X and water vapour. X then oxidizes to give reddish brown vapours of Y. What is X and Y?

1. NO₂ and NO

2. NO and NO₂

3. N₂O₅ and NO

4. N₂O and NO

Q. State how would you prepare copper (II) oxide from
(a) copper nitrate.
(b) copper carbonate.
(c) copper sulphate.

Q.

27. Name the gas evolved (formula is not acceptable). The gas that burns in oxygen with a green flame.

Q. The number of oxygen atoms used in the combustion of $1$ molecule of ethanol is:

1. $3$
2. $1$
3. $32$
4. $6$

Q.

The chemical name of the compound obtained by catalytic oxidation of ammonia is:

1. Nitrogen Dioxide

2. Nitrous Oxide

3. Nitrogen

4. Nitric Oxide

Q.

Match List-I with list-II

Column 1	Column 2
Haber process	${\mathrm{HNO}}_3$ synthesis
Ostwald process	Aluminum extraction
Contact process	${\mathrm{NH}}_3$ synthesis
Hall-Heroult process	${\mathrm{H}}_2{\mathrm{SO}}_4$ synthesis

Q. Name: [5 MARKS]
(a) a nitrate of metal which on heating does not give nitrogen dioxide.
(b) a nitrate which on heating leaves no residue behind.
(c) a metal nitrate which on heating is changed into metal oxide.
(d) a metal nitrate which on heating is changed into metal.
(e) a solution which absorbs nitric oxide.

Q.

Give balanced equation for the action of heat on :

Silver nitrate

Q. The metallic lustre exhibited by sodium is explained by :

1. diffusion of sodium ions
2. oscillation of mobile valence electrons
3. existence of free protons
4. existence of body centered cubic lattice

Q. What would you observe in the following cases?
(i) Sodium and potassium are placed in cold water.
(ii) Burning magnesium is introduced into steam.
(iii) Copper hydroxide is heated.
(iv) Potassium nitrate is heated strongly.
(v) Copper nitrate is heated strongly.
(vi) Mercuric nitrate is heated strongly.

Q.

State your observation for the following cases:

Ammonia gas is burnt in an atmosphere of oxygen in the absence of a catalyst.

Q.

Industrially ammonia is obtained by direct combination between nitrogen and oxygen.

1. Write the balanced correctly balanced equation for the direct combination of nitrogen and hydrogen?

Q.

Which element is commonly used in catalytic converters due to its property of a reducing agent?

1. O

2. At

3. Cs

4. Pt

Q.

State one relevant observation for each of the following reactions:
Burning of ammonia in air.

Q. On long exposure to moist air, a copper vessel lose its lustre and acquire a coating of basic copper carbonate which is ( colour ) ?

Q.

(b) (i) What are the products formed when ammonia is oxidized with copper oxide?
(ii) Name one lead compound that can be used to oxidize hydrogen chloride to chlorine.

Q. Copper undergoes corrosion in the presence of ______, oxygen, and water vapour to form ________.

1. carbon dioxide, copper carbonate
2. carbon monoxide, copper hydroxide
3. hydrogen sulphide, copper hydroxide
4. hydrogenn sulphide, copper carbonate

Q. What happens when we heat aqueous Baking Powder Solution in aluminium vessel??

Q.

Which element is commonly used in catalytic converters due to its property of a reducing agent?

1. O

2. At

3. Cs

4. Pt

Q.

Name the gas evolved in each case (the formula is not acceptable).

The gas that burns in oxygen with a green flame.

Q.

Complete the following word equations and write balanced molecular equations for the same : $\mathrm{Sulphur}+\mathrm{Oxygen}\to$

Q. Copper undergoes corrosion in the presence of ______, oxygen, and water vapour to form ________.

1. carbon dioxide, copper carbonate
2. carbon monoxide, copper hydroxide
3. hydrogen sulphide, copper hydroxide
4. hydrogenn sulphide, copper carbonate