Physical Properties of Ammonia

Q.

What will be the pH value of 0.05 M Ba(OH)₂ solution.

Q. In Haber process 30 litres of dihydrogen and 30 litres of dinitrogen were taken for reaction which yielded only 50% of the expected product. What will be the composition of gaseous mixture under the aforesaid condition in the end? (1) 20 litres ammonia, 20 litres nitrogen, 20 litres hydrogen (2) 10 litres ammonia, 25 litres nitrogen, 15 litres hydrogen (3) 20 litres ammonia, 10 litres nitrogen, 30 litres hydrogen (4) 20 litres ammonia, 25 litres nitrogen, 15 litres hydrogen

Q.

What is the difference between the chemical nature of an aqueous solution of hydrogen chloride and an aqueous solution of ammonia?

1. Aqueous hydrogen chloride is neutral while aqueous ammonia is basic in nature.

2. Aqueous hydrogen chloride is acidic while aqueous ammonia is basic in nature.

3. Aqueous hydrogen chloride is basic while aqueous ammonia is acidic in nature.

4. Aqueous hydrogen chloride is acidic while aqueous ammonia is neutral in nature.

Q.

Write two precautions required while finding the pH of the samples?

Q.

Dry ammonia gas has no action on litmus paper but a solution of ammonia in water turns red litmus paper blue.
Why is it so ?

Q. (i) How is ammonia gas prepared in laboratory starting from NH₄Cl? State the conditions and balanced equation for the preparation.
(ii) How is gas collected in a gas jar?
(iii) Name the substance used for drying ammonia gas. Why cannot substances such as conc. H₂SO₄, anhydrous calcium chloride and phosphorus pentoxide be used for drying ammonia gas?

Q. From the list given below, select the word(s) required to correctly complete the blanks (i) to (v) in the following passage:
Ammonia, Ammonium, Carbonate, Carbon dioxide, Hydrogen, Hydronium, Hydroxide, Precipitate, Salt, Water.
A solution 'X' turns blue litmus red so it must contain (i) ________ ions; another solution 'Y' turns red litmus blue and therefore must contain (ii) _________ ions. When X and Y are mixed together, the products will be a (iii) ________ and (iv) _________. If a piece of magnesium was put into solution X, (v) ________ gas would be evolved.

Q.

How is liquor ammonia different from liquid ammonia ?

Q. In the laboratory preparation method of ammonia, heating of ammonium chloride with slaked lime results in the formation of ammonia and water vapour along with calcium chloride.
In this method,
Statement I: Ammonia gas is collected by the downward displacement of air.
Statement II: Concentrated sulphuric acid is used as a drying agent.
Statement III: Ammonia gas collected in the cylindrical column changes the colour of moist red litmus paper blue.

Which of the above statements is/are correct?

1. Only I
2. II and III
3. I and III
4. Only III

Q.

Ammonia is a brown coloured, pungent-smelling gas which turns moist blue litmus paper into the red colour.

1. False

2. True

Q.

When an ammonium salt is warmed with sodium hydroxide solution, ammonia gas is evolved. State three ways in which you could identify this gas.

Q.

Is Clorox a base or acid?

Q.

The gas evolved on heating baking soda is:

1. Oxygen gas

2. Hydrogen gas

3. Chlorine gas

4. Carbon dioxide gas

Q.

In the fountain experiment to demonstrate the high solubility of HCl gas in water, dry HCl gas is filled in the round bottomed flask. Give reasons

Q.

How is ammonia gas be liquefied?

Q. When a gas filled in a closed vessel is heated through 1^° C, its pressure increased by 0.4%. The initial temperature of the gas is A-250 K B-2500 K C-250^° C D-25^° C

Q. (a) Define pH.
(b) State three applications of the pH scale.

Q.

Sodium hydroxide ($\mathrm{NaOH}$) is classified as a strong base. For every mole of Sodium hydroxide added to a large volume of water, one mole of what ion enters the solution?

Q.

Which of the following reagents is used to test the presence of ${\mathrm{SO}}_2$ Gas?

1. Alkaline Potassium Manganate

2. Alkaline Potassium Dichromate

3. Acidified Potassium Manganate

4. Acidified Potassium Dichromate

Q.

what is the colour of phenolphthalein in acidic and basic

Q. What is the purpose of Haber's process? Name the gaseous inputs in the Haber process and state the ratio by volume in which the gases are mixed. What is done to increase the rate of the reaction in Haber process? Give two different ways by which the product can be separated from the reactants.

Q.

Choose the correct words or phrases from the brackets to complete the following sentences:

Heating ammonium chloride with sodium hydroxide produces _____. (ammonia/nitrogen)

Q.

What would be the product if a compound containing carbon is burnt?

Q.

The colour of blue litmus will turn red in:

1. Glucose solution

2. Calcium hydroxide

3. Sodium hydroxide

4. Nitric acid

Q. Name a solution that will separate the components of the following mixtures:
(a) Zn(OH)₂ from Pb(OH)₂
(b) CaO from PbO
(c) CuO from ZnO

Q.

Name :

(a) the gas which is prepared by Haber's Process,

(b) two gases which give dense white fumes with ammonia,

(c) one salt of ammonia in each case which is used in :

(i) dry cell (ii) explosives (iii) medicine,

(d) an acidic gas which reacts with a basic gas liberating a neutral gas,

(e) a metallic chloride soluble in ammonium hydroxide,

(f) the gas obtained when ammoia burns in an atmosphere of oxygen without any catalyst,

(g) a nitride of a divalent metal which reacts with warm water liberating ammonia,

(h) an amphoteric oxide reduced by the basic gas,

(i) a white salt produced by an acid gas and a basic gas.

Q. What is the freezing point of solid ammonia ?

1. -70 degree celsius
2. -77.7 degree celsius
3. -50 degree celsius
4. -40 degree celsius

Q.

Ammonia reacts with carbon dioxide at ${150}^{0}C$ to give a valuable nitrogenous fertilizer X. Name this fertilizer.

1. Calcium ammonium nitrate

2. Diammonium phosphate

3. Urea

4. Monoammonium phosphate

Q.

Identify the olfactory element in the following: vanilla, onion and clove. Justify your answer.

Q.

Ammonia can be easily liquified by applying pressure.

1. True

2. False