P-1 Carbon Compounds — Science STD 10 — Question

How is the reflection of light ray from a plane mirror different from the refraction of light ray as it enters a block of glass?

A woman uses a device X made of a common metal for preventing pregnancy. This device works by preventing the implantation of fertilised egg cell (or embryo) in the female organ Y.

1. What are the two names of device X?
2. Name the organ Y.
3. Can this method of contraception protect a woman from acquiring a STD?

What is the unit of power of a lens? Define it.

What is an oxidising agent? Name two oxidising agents which can oxidise ethanol to ethanoic acid.

A convex mirror used as a rear-view mirror in a car has a radius of curvature of 3m. If a bus is located at a distance of 5m from this mirror, find the position of image. What is the nature of the image?

Write the laws :
One kcal heat

How does a universal indicator work?

Column I	Column II
1. Reduction	(a) Type of a chemical reaction
2. Oxidation	(b) Combination with hydrogen
3. Double displacement	(c) Losing hydrogen
4. Displacement	(d) Exchange of ions

Explain why, ionic compounds conduct electricity in solution whereas covalent compounds do not conduct electricity.