The experimentally determined molar mass for what type ofsubstances is always lower than the true value when water is used as solvent. Explain. Give one example of such a substance and one example of a substance which does not show a large variation from the true value.

What are the two types of pure substance ? Give one example of each type.

Which type of substances are called elastomers? Give one example?

To separate a substance from a liquid, name the five methods used. Give one example of each of them.

Give one example each from non-wettable substance and froth stabiliser used in froth floation process.

Assertion : Molecular mass of KCl calculated on the basis of colligative properties will be lower than the normal molecular mass. Reason : Experimentally determined molar mass is always lower than the true value. a)If both (A) and (R) are correct and (R) is the correct explanation of(A). b)If both (A) and (R) are correct, but (R) is not the correct explanation of (A). c)If (A) is correct, but (R) is incorrect. d)If both (A) and (R) are incorrect.

(a) Give one example of a paramagnetic substance. (b) Which type of binding force existing in ice?

Give one example of a nuclear reaction. Also define the Q-value of the reaction. What does Q gt 0 signify ?

What type of polymerization takes place when a polyester is formed ? Give one example of a polyester and name the monomers from which it is formed.