1.

Iron powder and sulphur powder 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 evoled and when dilute hydrochloric acid was added to part B then 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 of gas D. (e) Write one test to identify gas E.

Answer»

Iron powder and sulphur powder 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 evoled and when dilute hydrochloric acid was added to part B then 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 of gas D.

(e) Write one test to identify gas E.



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