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Chemistry Short Question
Group Va And Via Elements Short Questions Preparation

Chapter 4 Group Va And Via Elements Chemistry 12th Class Punjab Short Questions

Question No. 1 - Write the formulas of a Phosphorite b Chile saltpeter.

Answer No. 1 - a Phosphorite: Ca3PO42
b Chile saltpeter: NaNO3

Question No. 2 - Justify that H2SO4 is a king of chemicals?

Answer No. 2 - H2SO4 has many applications in daily life, laboratories, industries etc. Whats common to petrol, fertilizers, cars and soap. They like a lot of other things require sulfuric acid to be made. Thats why sulfuric acid is called the king of chemicals.

Question No. 3 - Name three allotropic forms of phosphorous?

Answer No. 3 - Phosphorus can exist in at least six different solid allotropic forms. But here mentioned only three.

Question No. 4 - Write names and formulas of oxyacids of nitrogen.

Answer No. 4 - Name Formula:
1. Nitrous Acid HNO2
2. Nitric Acid HNO3

Question No. 5 - Write any use of nitric acid?

Answer No. 5 - It is used as laboratory reagent.

Question No. 6 - Give the advantage of contact process for the manufacture of sulphuric acid.

Answer No. 6 - i Contact process gives good yield of sulphuric acid.
ii Contact process produce sulphuric acid which is in its pure form.

Question No. 7 - Give name and formulas of Oxyacids of Phosphorous.

Answer No. 7 - Name Formula
Phosphoric Acid H3PO3
Orthophosphoric Acid H3PO4
Pyrophosphoric Acid H4P2O7
Metaphosphoric Acid HPO3

Question No. 8 - What is aqua-regia?

Answer No. 8 - When one volume of concentrated HNO3 is mixed with three volume of concentrated HCI, aqua regia is formed. It is employed to dissolve gold and platinum.
HNO3conc+ 3HCIconc---------NOCIaq+ Cl2g + 2H2Ol

Question No. 9 - Describe Ring test for confirmation of presence of nitrate ions in solution?

Answer No. 9 - To the aqueous solution of NO3 ions add FeSO4 solution. Shake it well and add concentrated H2SO4 along the side of test tube. It forms a ring of brown coloured addition compound at the junction of two liquids due to the addition compound formed by the action of NO produced wit FeSO4
FeSO4aq+ NOg--------->FeSO4.NOaq

Question No. 10 - Write any important uses of H2SO4?

Answer No. 10 - It is used in manufacturing of fertilizers like ammonium sulphate and calcium superphosphate.

Question No. 11 - Give definition of allotropy. Write allotropes of phosphorus.

Answer No. 11 - Definition: When an elements exist in different crystalline forms. These crystalline forms are called allotropic forms and this phenomenon is called allotropy.

Question No. 12 - How does HNO3 act as an oxidizing agent?

Answer No. 12 - It acts as a strong oxidizing agent due to the ease with which it is decomposed.
2HNO3aq---------->H2O + 2NO2g +[O]g

Question No. 13 - Why SO3 is dissolved in H2SO4 and not in water?

Answer No. 13 - SO3 is not directly dissolved in water, since absorption is incomplete and mist of SO3 and H2SO4 fills the factory, which causes great causes great inconvenience the workers. Therefor,SO3 is absorbed in concentrated H2SO4 and OleumH2S2O7 formed can be converted to sulphuric acid of any strength by mixing adequate quantities of water.

Question No. 14 - Write two dissimilarities of oxygen and sulphur?

Answer No. 14 - Oxygen:
1 It is gas at ordinary temperature.
2 Oxygen is sparingly soluble in water.
3 It is paramagnetic in nature.

Question No. 15 - Why Dinitrogen Oxide is called Laughing gas?

Answer No. 15 - Its mixture with a little oxygen,if inhaled for a sufficiently long time, produces hysterical laughter, hence it is also known as laughing gas.

Question No. 16 - How does nitrogen differ from other elements of its group? Give a point.

Answer No. 16 - Nitrogen is diatomic gas and occurs in free state while other members tetra atomic solids and occur in combines state.

Question No. 17 - How HNO3 can be two metals which evolve hydrogen upon reaction with HNO3?

Answer No. 17 - In laboratory, nitric acid is prepared by heating potassium nitrate crystals with concentrated sulphuric acid.
KNO3s+ H2SO4conc---------->KHSO4aq+ HNO3aq

Chapter 4 Group Va And Via Elements Chemistry 12th Class Punjab Short Questions

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