Choose the correct answer — task. Science CBSE, Class 10.

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1.

Which of the following statements about noble gases is correct?

They have partially filled valence shell.
All of them are electron donors.
They have completely filled valence shell.
Like all metals and non-metals, they have electrons in the valence shell.

2.

Which of the following is the incorrect statement?

Only the physical differences between the gangue and the ore can be used to separate the gangue from the ore.
For carbonates of medium reactive metals, calcination is used.
For sulphates of medium reactive metals, roasting is used.
Metals with medium reactivity mostly can be found as their oxides or sulphide or carbonates on the earth's crust.

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