Chemistry
Calculate
(i) The volume of 2.5 moles of a gas X at stp.
(ii) The weight of 2.8 dm3 of a basic gas you have learnt, at STP.
(iii) The molecular weight of a gas Y whose 5.6 litres of volume at STP weighs 3.5 gms.
(at wt of C = 12, X = 14, H = 1, O = 16)
Related Questions
(i) Name the metalloid(s) of period 3.
(ii) Define atomic size.
(iii) What would be seen on mixing a solution of calcium chloride with a solution of sodium carbonate? Write an equation also.
(iv) Write an equation for the preparation of a hydroxide of a metal which is
Green
Light blue
Give a chemical test in each case to distinguish between the following pairs of chemicals.
(i) Sodium chloride solution and sodium nitrate solution.
(ii) Sodium sulphate solution and sodium chloride solution.
(iii) Calcium nitrate solution and zinc nitrate solution.
Concentrated nitric acid oxidises phosphorus to phosphoric acid as
P + HNO3 ⟶H3PO4 + H2O + NO2
Balance the equation and answer the following questions based on it.
(i) What mass of phosphoric acid can be prepared from 6.2 g of phosphorus?
(ii) What mass of nitric acid will be consumed at the same time ?
(iii) What would be the volume of steam produced at the same time if measured at 760 mm. Hg pressure and 273°C.
(Atomic wt of H = 1, N = 14, O = 16, P = 31) ?
What is an 'alloy'. Give composition of
(i) duralumin
(ii) brass
(iii) fuse metal.