Chemical Reactions and Equations — Science STD 10 — Question

An element is soft and can be cut with a knife. It is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be:

Metal M reacts with oxygen to form metallic oxide MO. This oxide reacts with moisture and carbon dioxide of the atmosphere to form a basic carbonate metal M. The metal 'M' is:

The type of reaction that releases heat along with the formation of product is called __________.

An acid (A) with sodium hydrogencarbonate is used in making the cakes fluffy and spongy. It is due to the release of (B) gas in the reaction. Here, A and B are:

What is the common name of calcium oxide?

The metal which can be extracted simply by heating the cinnabar ore in air is:

1. Zn
2. Cu
3. Al
4. Hg

A student is testing water to know which is best for cleansing purposes with soaps. He would find that the cleansing action of soaps is best when he uses water obtained from.

The rechargeable battery used in a mobile phone hand set is usually:

Malachite is an are of:

Litmus solution is a _____ dye.