41.
Silicon is used in

43.
Vulcanized rubber contains sulphur

44.
Which of the following alloy is used in making magnet ?

45.
In its reaction with silver nitrate, C2H2 shows

46.
Yellow Cake an item of smuggling across border is

47.
The transuranium elements are the chemical elements with atomic numbers greater than

48.
Which of the following elements is non-radioactive ?

49.
Which of the following is used in dating archaeological findings ?

50.
German silver used for making utensils is an alloy of