41.
Which of the following are the ingredients of gun metal?

42.
From which mineral is radium obtained?

43.
What is laughing gas?

44.
Actinides are the elements with atomic numbers from

45.
The two elements that are frequently used for making transistors are:

46.
The filament of an electric bulb is made of

47.
Diamond is an allotropic form of:

48.
In fireworks, the green flame is produced because of

49.
Permanent hardness of water can be removed by adding:

50.
Marsh gas is

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