Define the following terms:

(a) Molar volume

(b) Normal salt

Draw the electron dot structure of:

(a) Methane molecule

(b) Nitrogen molecule

[Atomic number: N = 7, C = 6, H = 1]

Choose the organic compound from the list given below to answer the following questions:

$\boxed{\text{Ethene, Ethanoic acid, Ethanol, Methanal}}$

(a) The compound which does not have a double bond in its structure.

(b) The compound which in its pure form turns into an ice like solid on cooling.

(c) The compound which is used for artificial ripening of fruits.

Name the main metal used in making of the alloys given below:

(a) Duralumin

(b) Stainless steel