Chemistry
From the list of substances given — Ammonium sulphate, Lead carbonate, Chlorine, Copper nitrate, Ferrous sulphate — State : A substance that turns moist starch iodide paper blue.
Related Questions
State what is observed when excess of ammonia passed through an aqueous solution of lead nitrate.
Give one test each to distinguish between the following pairs of chemical solutions
(i) Zn(NO3)2 and Ca(NO3)2
(ii) NaNO3 and NaCl
(iii) Iron [III] chloride and copper chloride .
Give a reason why carbon dioxide and sulphur dioxide cannot be distinguished by using lime water.
Salts A, B, C, D and E undergo reactions (i) to (v) respectively. Identify the anion present in each salt.
(i) When AgNO3 solution is added to a soln. of A, a white precipitate, insoluble in dilute nitric acid, is formed.
(ii) Addition of dil. HCl to B produces a gas which turns lead acetate paper black.
(iii) When a freshly prepared solution of FeSO4 is added to a soln. of C and conc. H2SO4 is gently poured from the side of the test-tube, a brown ring is formed.
(iv) When dil. H2SO4 is added to D a gas is produced which turns acidified K2Cr2O7 soln. from orange to green.
(v) Addition of dil. HCl to E produced an effervescence. The gas produced turns limewater milky but does not effect acidified K2Cr2O7 soln.