Baking soda is a mixture of :

Calcium oxide reacts vigorously with water to produce slaked lime.

This reaction can be classified as:

(A) Combination reaction (B) Exothermic reaction

(C) Endothermic reaction (D) Oxidation Reaction

Which of the following is a correct option?

A. a and c

B. c and c

C. a,c and d

D. a and b

OR

When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black participate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution . The reaction is an example of a :

A. Combination reaction B. Displacement reaction

C. Decomposition reaction D. Double displacement

In a double displacement reaction such as the reaction between sodium sulphate solution and barium chloride solution :

(A) exchange of atoms takes place (B) exchange of ions takes place

(C) a precipitate is produced (D) an insoluble salt is produced

The correct option is :

The chemical formula for plaster of paris is :

The laws of reflection hold true for:

(a) plane mirrors only (b) concave mirrors only

(c) convex mirrors only (d) all reflecting surfaces

OR

When an object is kept within the focus of a concave mirror, an enlarged image is formed behind the mirror. this image is:

(a) real (b) inverted

(c) virtual and inverted (d) virtual and erect