Write the important reactions involved in the manufacture of sulphuric acid by contact process.

Contact process for manufacturing of sulphuric acid: Steps involved in the manufacturing of sulphuric acid are as stated below: Preparation of sulphur dioxide. Conversion of sulphur dioxide into sulphur trioxide. Conversion of sulphur trioxide formed into concentrated H 2 SO 4 . Step 1: Preparation of sulphur dioxide: SO 2 is prepared by burning sulphur in the presence of excess air so that the product combines with oxygen which is helpful for the next stage. S ( s ) + O 2 ( g ) → SO 2 ( g ) . Step 2: Preparation of sulphur trioxide: Sulphur trioxide is formed when sulphur dioxide reacts with oxygen in a ratio of 1 : 1 at a temperature of 400 ° C – 450 ° C and a pressure of 1 - 2 atm in the presence of V 2 O 5 as a catalyst. This reaction is reversible in nature. 2 SO 2 ( g ) + O 2 ( g ) ⇌ 2 SO 3 ( g ) . Step 3: Preparation of concentrated sulphuric acid: The sulphur trioxide formed is first made to react with concentrated sulphuric acid. Sulphur trioxide cannot be dissolved in water directly as it leads to the formation of fog. The product obtained after this reaction is known as oleum. The oleum obtained is then dissolved in water to obtain concentrated sulphuric acid. H 2 SO 4 + SO 3 ( g ) → H 2 S 2 O 7 ( l ) . H 2 S 2 O 7 ( l ) + H 2 O ( l ) → 2 H 2 SO 4 .

What happens when Cl 2 reacts on dry slaked lime?

Chlorine reacts with dry slaked lime to give a mixture of calcium chloride and calcium hypochlorite. Thus, during the reaction of chlorine gas with dry slaked lime, bleaching powder is obtained. Ca OH 2 Calcium hydroxide ( Slaked lime ) + Cl 2 → CaOCl 2 Calcium oxychloride + H 2 O .

What are the neutral oxides of nitrogen?

Oxides of nitrogen are a mixture of gases that are composed of nitrogen and oxygen. Two of the most toxicologically significant compounds are nitric oxide ( NO ) and nitrogen dioxide ( NO 2 ) . Other gases belonging to this group are nitrogen monoxide (or nitrous oxide, N 2 O ), and nitrogen pentoxide ( N 2 O 5 ). The oxides of nitrogen that are neutral include nitrous oxide ( N 2 O ) and nitric oxide ( NO ). Nitric oxide is only slightly soluble in water while nitric oxide is soluble in cold water.