On dissolving chalk powder in water, a suspension is obtained. Give any four reasons to support the fact that mixture so obtained is a suspension only.

Chalk powder in water is an example of a suspension.

When salt is stirred into water, the mixture so obtained is a _

Give any four reasons why water is necessary in our body.

A white powder is used by doctors to support fractured bones. (a) Write the name and chemical formula to the powder (b) How is this powder prepared (c) When this white powder is mixed with water, a hard solid mass is obtained. Write a balanced chemical equations for the changes. (d) Give one more use of this white powder.

A white powder is used by doctors to support fractured bones. (a) Write the name and chemical formula fo the powder. (b) How is this powder (c) When this white powder is mixed with water, a hard solid mass is obtained. Write a balanced chemical equations for the changes. (d) Give one more use of this white powder.

If 5 g. of a solute is added to 50 ml. of a solvent at a particular temperature and the solution can dissolve more of the solute at that temperature - is the solution obtained a saturated or an unsaturated solution. Give reasons.

A white sodium salt dissolves readily in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the aforementioned solution, a white precipitate is obtained which does not dissolved in dil. nitric acid. The anion is :

A mixture of two white substances was dissolved in water.On passing Cl_2 gas through the solution a deep brown colour is developed. Addition of BaCl_2 solution to the original solution gives a white precipitate.Addition of a large amount of NaOH solution to the original solution gives a white precipitate, whose suspension in water is used as an antacid.The mixture gives golden yellow colour flame. The mixture contains :