Name the following:
- A substance which will burn in oxygen to produce an acidic oxide.
- Two substances that will react with each other to produce chlorine.
- Two acids other than sulphuric acid which can be prepared by using sulphuric acid.
- A normal salt and an acid salt of the same acid.
- The acid salt which gives sodium ions and sulphate ions in solution.
- A metal which occurs free in nature.
- An alloy of zinc used in the simple voltaic cell.
- The allotrope of the non-metal carbon which conducts electricity.
- A reagent which can be used to distinguish between ethyne and ethene.
- One lead compound that can be used to oxidize hydrogen chloride to chlorine.
- Name the gaseous inputs of the Haber’s Process.
- The catalyst used in Ostwald’s process.
- A soluble lead salt.
- The catalyst used in the Contact process.
- An alkali used in the manufacture of soaps.
- A gas which is neutral and behaves as an oxidizing and a reducing agent.
- An ammonium salt used as a component of smelling salts.
- A nitrate which gives off oxygen and nitrogen dioxide when heated.
- The product obtained at the cathode on electrolysis of sodium silver cyanide solution.
- A neutral gas which reacts with a non-metal to give an acidic gas.
Give reasons for the following:
- Electrovalent compounds are good conductors of electricity in molten or aqueous solution state.
- Salts like calcium carbonate and lead carbonate cannot be electrolysed.
- Dil. HCL cannot be concentrated by distilling (boiling) the dilute acid.
- Fumes are seen evolving out when a bottle of hydrochloric acid is opened.
- Ammonia cannot be dried using sulphuric acid.
- Concentrated sulphuric acid is kept in air tight bottles.
- A black mark is left on a wooden plank on which concentrated sulphuric acid has accidentally fallen.
- A base may not be an alkali.
- Lead nitrate is not preferred for ring test.
- Ethyne is comparatively more reactive than ethene.
- Barium chloride solution is used to distinguish between a sodium sulphate solution and a sodium nitrate solution.
- Electrolysis is carried out on acidified and not on pure water.
- Why is bleaching by sulphur dioxide only temporary?
- Explain why carbon tetrachloride does not dissolve in water.
- Why limestone is added to the furnace in the manufacture of iron?
What is observed when-
- Silver nitrate solution is added to dilute hydrochloric acid.
- Hydrogen chloride mixes with ammonia.
- Ammonia hydroxide solution is added to copper sulphate in excess.
- Concentrated nitric acid is added to copper.
- Barium chloride solution is added to dilute sulphuric acid.
- A solution of calcium chloride is mixed with a solution of sodium carbonate.
- Lead nitrate solution is added to sodium chloride solution.
- Ethene is bubbled through a solution of bromine in tetra chloromethane.
- Sodium hydroxide solution is added to zinc sulphate solution in excess.
- NH3 gas is bubbled through red litmus solution.
- Zinc oxide is heated.
- Sulphur dioxide is passed through lime water.
Explain the terms:
- Homologous series.
- Electron affinity.
- Atomic radius.
- Functional group.
- Weak acid.
- Acid salt.
- Ethane and Ethene.
- Electrolytes and non-electrolytes.
- Voltmeter and Voltameter.
- Oxidation and reduction.
- Electrovalent bond and covalent bond.
- Ionization potential and electron affinity.
- Roasting and rusting.
- An aqueous solution of HCl and aqueous solution of Ammonia.
- Basicity of acids and acidity of bases.
- Catenation and isomerism
- Find the empirical formula of a substance having the following percentage composition:
K=31.84%, Cl=28.98%, O=39.18%
- An organic liquid was found to possess the following percentage composition:-
C=12.8%, H=2.1%, Br=85.1%. its molecular weight is 188. Find its molecular formula.
- An Organic liquid gave on analysis the following results:
O=42.8%, N=18.5%, H=6.8% . The vapor density is 37.5. Find the empirical formula of the organic compound.
- Potassium Chlorate decomposes on heating to give potassium chloride and oxygen. What weight of oxygen will evolve on heation 20 gms of Potassium Chlorate.
- What weight of sulphuric acid and ammonia is required for the preparation of 66gms of ammonium sulphate?
- What is the Molarity of a solution of nitric acid if it is 71% pure and has a specific gravity of 1.43?
- What volume of oxygen would be needed for the complete combustion of 50 litres of ethane.
- Determine the percentage composition of hydrated zinc sulphate (ZnSo4.7H2O). [Zn=65, S=32, O=16]