Q7 of 30 Page 1

Baking soda is a mixture of:

Baking powder is a mixture of sodium hydrogen carbonate NaHCO3 and tartaric acid (C4H6O �6). It can be used for increasing volume and soften baked products.

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5

The compound obtained on reaction of iron with steam is /are:

A. Fe2O3 B. Fe3O4


C. FeO D. FeO3 and FeO4


OR


An element ‘X’ reacts with O2 to give a compound with a high melting point. This compound is also soluble in water. The element ‘X’ is likely to be:


A. iron B. calcium


C. carbon D. silicon


 6

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:


 8

The chemical formula for plaster of paris is:

 9

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