Remaining (Midterm)

Question 1

The product in Lassaigne’s extract is?

Answer 1

Sodium Cyanide (NaCN)

Question 2

Sodium Cyanide reacts with Ferrous Sulphate to form?

Answer 2

Sodium Ferrocyanide

Question 3

Thus, Sodium Ferrocyanide reacts with Ferric Chloride to form a Prussian Blue?

Answer 3

Ferric Ferrocyanide

Question 4

Test for Halogens: Decant the mother liquor and treat the precipitate with dilute aqueous _______ solution.

Answer 4

Ammonia

Question 5

If the precipitate is white and readily soluble in ammonia, _________ is present.

Answer 5

Chlorine

Question 6

If it is pale yellow and slightly soluble in ammonia, _______ is present.

Answer 6

Bromine

Question 7

If it is yellow and insoluble in ammonia, then ______ and _______ may be confirmed by some more tests.

Answer 7

Iodine and Bromine

Question 8

_______ and ________ ions both interfere with this test for halide by forming silver cyanide and silver sulphide precipitates.

Answer 8

Cyanide and Sulphide

Question 9

To remove cyanide and sulphide ions, we have to acidify the fusion solution with dilute ______ ____.

Answer 9

Nitric Acid

Question 10

Carbon and hydrogen are detected by heating the compound with?

Answer 10

Copper(II) OXide

Question 11

If carbon is present, it forms?

Answer 11

Carbon Dioxide gas

Question 12

If hydrogen is present, it forms?

Answer 12

Water Vapor

Question 13

Calcium Hydroxide reacts with Carbon Dioxide to form _______ _________ and Water (milky white).

Answer 13

Calcium Carbonate