Hydrous ferrous sulphate crystals are heated in a boiling tube for few seconds. Water droplets are seen in the inner sides of test tube and the colour of the crystals changes. On continuous heating a colourless gas X with smell of burning sulphur is evolved and a residue Y is obtained. What is the colour of the crystals before and after mild heating?

Hydrous ferrous sulphate crystals are heated in a boiling tube for few seconds. Water droplets are seen in the inner sides of test tube and the colour of the crystals changes. On continuous heating a colourless gas X with smell of burning sulphur is evolved and a residue Y is obtained. Identify the gas X and the residue Y formed.

Hydrous ferrous sulphate crystals are heated in a boiling tube for few seconds. Water droplets are seen in the inner sides of test tube and the colour of the crystals changes. On continuous heating a colourless gas X with smell of burning sulphur is evolved and a residue Y is obtained. Write the balanced chemical equation for the above reaction.

When a green iron salt is heated strongly, its colour finally changes to brown and odour of burning sulphur is given out. Name the iron salt.

When a green iron salt is heated strongly, its colour finally changes to brown and odour of burning sulphur is given out. Name the type of reaction that takes place during heating of iron salt.

When we heat lead nitrate [Pb(NO_3)2] in a boiling tube, we observe the emission of brown fumes. Which one of the following is the brown gas?

When a student added zinc granules to dilute HCI, a colourless and odourless gas was evolved, which was then tested with a burning match stick, what would be observed?

When a student added zinc granules to dilute HCI, a colourless and odourless gas was evolved, which was then tested with a burning match stick, what would be observed?

Rohit and Mayuri conducted two experiments to study the types of chemical reactions as shown in the given figures. They recorded their observations as : I. In experiment 1, yellow residue is left behind while in experiment 2 reddish brown solid is left behind. II. In both experiments, two different gases were given out. III. The colourless gas evolved in experiment 1 extinguishes the glowing splint while the gas evolved in experiment 2 turns green solution of acidified KMnO_4 orange. IV. X is reddish brown gas while gases Y and Z both have burning sulphur smell. The incorrect observation(s) is/are

You are given the following materials : {:((i), "Iron nails",, (ii), "Copper sulphate solution"),((iii), "Barium chloride solution",, (iv), "Copper powder"),((v), "Ferrous sulphate crystals",, (vi), "Quick lime"):} Identify the type of chemical reaction taking place when : (a) Barium chloride solution is mixed with copper sulphate solution and a white precipitate is observed. (b) On heating, copper powder in air in a china dish, the surface of copper powder becomes black. (c) On heating green ferrous sulphate crystals, reddish brown solid is left and a gas having smell of burning sulphur is noticed. (d) Iron nails when left dipped in blue copper sulphate solution becomes brownish in colour and blue colour of copper sulphate solution fades away.