Iron filings and sulphur were mixed together and divided into two parts, 'A' and 'B'. Part 'A' was heated strongly while part 'B' was not heated. Dilute hydrochloric acid was added to both the parts and evolution of gas was seen in both the cases. How will you identify the gases evolved?

Iron powder and sulphur powder were mixed together were mixed together and divided into two parts A and B. when part A was heated strongly over a burner , then a substance C was formed , the part B was however , not heated at all .when dilute hydrochloric acid was added to substance C , then gas D was evolved and when dilute hydrochloric acid was added to part B them gas E was evolved . (a) what type of substance is B ? (b) what type of substance is c? (c ) Name the gas (i ) D, and (ii) E (d) state one characteristic property fo gas D. (e ) Write one test to identify gas E.

What gas is evolved when dilute hydrochloric acid is added to iron sulphide and heated? What is its odour?

Name the parts where A. hydrochloric acid is added to food. B. bile is produced. C. water is absorbed.

How should 1 kg of water at 5^@C be divided into two parts so that if one part turned into ice at 0^@C , it would release enough heat to vapourize the other part? Latent heat of steam =540 cal//g and latent heat of ice =80 cal//g .

How should 1 kg of water at 5^@C be divided into two parts so that if one part turned into ice at 0^@C , it would release enough heat to vapourize the other part? Latent heat of steam =540 cal//g and latent heat of ice =80 cal//g .