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1.	Different steps involved in the manufacture of sulphuric acid in contact process are given below. Arrange them in the correct sequence Formation of oleum Oxidation of `SO_2` , Hydrolysis of oleum Combustion of sulphurA. d a c bB. a d b cC. d b a cD. a d c b
Answer» (i) Combustion of sulphur (ii) Oxidation of `SO_2` (iii) Formation of oleum (iv) Hydrolysis of oleum

2.	Steps involved in the Frasch process are given below. Arrange them in the correct sequence , Three melts the sulphur below melting point The sulphur foam formed rises in the middle pipe and is collected. Surerheated steam under pressure is sent through the outermost pipe Hot compressed air is sent through the innermost pipe , which froth up the molten sulphur below Three concentric pipes are drilled through the ground to the sulphur depositsA. e c a d bB. e a d c bC. e a d b cD. e d a c b
Answer» (i) Three concentric pipes are drilled through the ground to the sulphur deposits. (ii) Superheated steam under pressure is sent through the outermost pipe. (III)This melts the sulphur below melting point Hot compressed air is sent through the innermost pipe, which froths up the molten sulphur below. (V) The sulphur foam formed rises in the middle pipe and is collected

3.	Arrange the different forms ofsulphur formed during heating fouowed by cooling Meu sulphur Flower of sulphur Rhombic sulphur sulphur vapoar Lambda sulphur Monoclinic sulphurA. e c f a d bB. c f e a d bC. c f a e d bD. c f e a b d
Answer» (i) Rhombic sulphur (ii) Monochnic sulphur (iii) Lambda sulphur (iv) Meu sulphur (v) Sulphur vapour (vi) Flower of sulphur

4.	The steps involved in the manufacture of glass are given below. Arrahge them in the correct sequence Moderate colling Addition of cullet Formation of respective silicates Preparation of fine powder of raw materials Heating of cullet at about 1600K to 1700KA. d b e c aB. d e b a cC. d e c b aD. d b c e a
Answer» (i) Preparation of fine powder of raw materials. (ii) Preparation of cullct (iii) Heating of cullet at about 1600K to 1700K. (iv) Formation of respective silicatee. (v) Moderate cooling

5.	In an industry, `H_2S` gas is mixed with chlorine gas before releasing it into the atmosphere. Give the appropriate reason.
Answer» `H_2S` gas is poisonous and the antidote for this gas is chlorine. Chlorine has the property to Components of soap destroy the effect of `H_2S` by oxidizing it to sulphur

6.	Nitric acid attacks all the metals except noble metals but the nature of products of same metal along with corresponding nitrates depends upon the concentration of `HNO_3`. Explain.
Answer» In conc. `HNO_3`, more number of `NO_3` ions are present per unit volume, these `NO_3` ions acts as oxidizinga gent. It gets reduced to `NO_2` duet to , more production of oxygen. In casoef dilute `HNO_3` less number of `NO_3^+ ` Ions are present. So It gets reduced to mtrlc oxide

7.	Why is the compound AgCl used in photo gray lenses
Answer» (i) Change in AgCl in the presence of sunlight. (ii) Effect of UV light on AgCl. (iii) Products obtained. (iv) Changes observed. (v) Effect of the product on the colour of lenses.

8.	`HNO_3` on reaction with phosphorus givesA. phosphorus acidB. phosphoric acidC. metaphosphoric acidD. hypophosphoric acid
Answer» `P+5HNO_3rarrH_3PO_4+5NO_2+H_2O`

9.	Hydrogen chloride gas can be subjected to drying only with conc. `H_2SO_4` but not with quick lime or phosphorus pentoxide. Explain
Answer» (i) Reaction of `P_2O_5` and CaO with HCl. (ii) Reactivity of the HQ with `H_2SO_4`, CaO, `P_2O_5`. (iii) Reactions which are feasible. (iv) Products obtained. (v) Requisite for a drying agent.

10.	Mention the chemical formulae of (i) Phosgene (ii) tear gas and (iii) chloroform
Answer» `COCL_2` (ii) `"CC"l_3NO_2` (iii)`CHCL_3`

11.	Equal volumes of nitrogen and oxygen react to give `"___________"`
Answer» Nitric oxide(NO).

12.	Write a note on safety matches
Answer» (i) Composition (ii) Property (iii) Mechanismof burning