Question

a. Balance the following equations : [2x1]

(i) Na + H2O →NaOH + H2

(ii) Mg + N2 →Mg3N2

b. Write any two characteristics of metals. [1]

c. State the use of : [2x1]

(i) Magnesium in Duralumin.

(ii) Mercury in sodium amalgam​

Answer 1

Answer:

a.

i.) 2Na + 2H2O = 2NaOH + H2

ii.) 3 Mg + N2 = Mg3N2

b.) Metals are lustrous, malleable, ductile, good conductors of heat and electricity.

c.

i.) Duralumin Uses

It is used in places where good strength and good machinability are required. It is used in heavy-duty forgings, wheels, plates, extrusions, aircraft fittings, space booster tankage and trauck frame, and other suspension components.

ii.) Sodium amalgam, commonly denoted Na(Hg), is an alloy of mercury and sodium. The term amalgam is used for alloys, intermetallic compounds, and solutions (both solid solutions and liquid solutions) involving mercury as a major component.