Nitric acid, `HNO_3` is a colourless, corrosive liquid used in the manufacture of Nitrogen fertilizers and explosives. In an experiment to develop new explosives for mining operations, a 28.5 g sample of `HNO_3` was poured into a beaker. How many moles of `HNO_3` are there in this sample of `HNO_3`?

Write the products formed in the reaction of nitric acid (both dilute and concentrated) with zinc. (i) Zinc with Conc. HNO_(3) : (ii) Zinc with Dil. HNO_(3):

How would you make up 425 mL of 0.150M HNO_3 from 68.0% HNO_3 ? The density of 68.0% HNO_3 is1.41g/mL.

Study the following statements regarding acid rain and select the incorrect ones. (i) Acid rain refers to the rainfall and other forms of precipitation with a pH of less than 5. (ii) Oxides of sulphur and nitrogen are released from automobile exhausts, industries , power plants, etc. (iii) These oxides of sulphur and nitrogen, may react with water in the air and form sulphuric acid (H_(2)SO_(4)) and nitric acid (HNO_(3)) . (iv) Acid rain has harmful effects on animals and human beings but no characteristic impact on plants.

How many molecules are there in a 3.46 g sample of hydrogen chloride, HCl? Note: The number of molecules in a sample is related to moles of compound (1 mol HCl = 6.023 xx 10^(23) HCl molecules). Therefore if you first convert grams HCl to moles, then you can convert moles to number of molecules).

(i) Consider the oxidation of nitric oxide to form NO_(2) 2NO_((g))+O_(2(g)) to 2NO_(2(g)) (a) Express the rate of the reaction in terms of changes in the concentration of NO, O_(2) and NO_(2) . (b) At a particular instant, when [O_(2)] is decreasing at 0.2mol L^(-1)s^(-1) at what rate is [NO_(2)] increasing at that instant? (ii) Classify the following as acid (or) base using Arrhenius concept 1. HNO_(3)" " 2.Ba(OH)_(2)" "3. H_(3)PO_(4)" " 4. CH_(3)COOH