Acids, Bases and Salts — Science STD 10 — Question

Bottle A contains oxalic acid and bottle B contains sodium carbonate solution. When pH paper is dipped in each of the solutions, the colour seen in A and B respectively be

The pH of the gastric juices released during digestion is:

Which element is stored in water and which element is stored in kerosene?

Which among the following statements is incorrect for magnesium metal?

1. It burns in oxygen with a dazzling white flame.
2. It reacts with cold water to form magnesium oxide and evolves hydrogen gas.
3. It reacts with hot water to form magnesium hydroxide and evolves hydrogen gas.
4. It reacts with steam to form magnesium hydroxide and evolves hydrogen gas.

Reaction of metals with sulphuric acid produced:

The fuel which usually burns with a blue flame is:

You are given the solution of lead nitrate. In order to obtain a yellow precipitate you should mix with it a solution of:

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

Magnesium ribbon burns in air with:

Which one of the following is non-crystalline or amorphous?