Organic Chemistry — Chemistry STD 10 — Question

What do you understand by dipole (polar) molecule ? Explain it by taking hydrogen chloride as an example ?

Aluminium is extracted from its chief ore bauxite. The ore is first purified and then the metal is extracted from it by electrolytic reduction.
Mention one reason for the use of aluminium in thermite welding. Which particular property of cast iron makes it unsuitable for the construction of bridges?

How is ethane prepared in the laboratory?

State Avogadro's Law

(a) Draw the structural formula of ethene.
(b) What is the feature of the ethene structure, which allows ethene to react with chlorine in the way it does?

Name:
The oxide of nitrogen which turns brown on exposure to air. How is it prepared? 

List 1 contains the meta ls I alloys (1, 2, 3, 4, 5 ) and list 2 contains their uses (A, B, C, D, E).

List 1 Metal/Alloy	List 2 Uses
1. Aluminium	A. Steel making
2. Lead	B. aeroplane wings
3. Brass	C. galvanizing
4. Iron	D. radiation shield
5. Zinc	E. electricaI fittings

Copy and complete the following table, write down the correct letter against the numbers representing metals. An answer may be used only once. The first has been done for you.

Metal	1	2	3	4	5
Use	B

Write the equation for the following reaction:
Ethene and water (steam)

Name the products formed when:
carbon and conc. Nitric acid is heated