Acids, Bases and Salts — Science STD 10 — Question

Name two metals whose melting points are so low that they melt when held in the hand.

Which of the two has a branched chain: isobutane or normal butane?

Why is a series arrangement not used for connecting domestic electrical appliances in a circuit?

State one use of nuclear fission reactions.

What type of chemical reactions take place when:
A magnesium wire is burnt in air?

Name the method by which aluminium metal is extracted.

A ray of light travelling in air is incident on a parallel-sided glass slab (or rectangular glass slab). Draw a ray-diagram indicating the change in its path in glass.

If water contains dissolved calcium hydrogen carbonate then out of soaps and synthetic detergents, which one will you use for cleaning the dirt of clothes?

What is the nature of the image formed by a convex lens if the magnification produced by the lens is +3?

Do all cells use oxygen to produce energy?