Periodic Properties And Variation Of Properties Physical And Chemical — Chemistry STD 10 — Question

Write an equation for the laboratory preparation of

1. An unsaturated hydrocarbon from calcium carbide.
2. Alcohol from ethyl bromide.

In the formation of magnesium chloride (by direct combination between magnesium and chlorine) name the substance that is oxidized and the substance that is reduced.

Complete the following calculations. Show working for complete credit :
If 6 litres of hydrogen and 4 litres of chlorine are mixed and exploded and if water is added to the gases formed, find the volume of the residual gas.

By drawing dot diagram, show the lone pair effect leading to the formation of ammonium ion from ammonia gas and hydrogen ion.

Explain the terms empirical formula and molecular formula.

Under what conditions does ethane get converted to acetaldehyde .

A, B, C and D summarize the properties of sulphuric acid depending on whether it is dilute or concentrated. Choose the property (A, B, C or D), depending on which is relevant to each of the preparations (i) to (iv) :
A. Dilute acid (typical acid properties), B. Non-volatile acid, C. Oxidising agent, D. Dehydrating agent
(i) Preparation of hydrogen chloride.
(ii) Preparation of ethene from ethanol
(iii) Preparation of copper sulphate from copper oxide.
(iv) Action of conc. sulphuric acid on sulphur

What is the function of:
(i) finely divided iron
(ii) Molybdenum in the above process