Four elements P, Q, R and S have atomic numbers of 4, 10, 12 and 14 respectively. Which of these elements is noble gas?

The best treatment for a student who accidentally poured conc tetraoxosulphate(vi) on his skin in the laboratory is to wash his skin with?

Which of the following can be obtained by fractional distillation?

8g of \( \mathrm{CH_4} \) occupies 11.2 at S.T.P. What volume would 22g of \( \mathrm{CH_3CH_2CH_3} \) occupy under the same condition?

An example of a polysaccharide is?

What are the possible oxidation numbers of an element if its atomic number is 17?

Duralumin consists of aluminum, copper?

The electronic configuration of an element is \(1S^2\) \(2S^2\) \(2P^6\) \(3S^2\) \(3P^3\). How many unpaired electrons are there in the element?

What process would coal undergo to give coal gas, coal tar, ammoniacal liquor and coke?