Which metal reacts with water?

Which of the following is known as artificial silk? 

Which of these non-metals is shiny?

Of the options listed below, the speed of sound is highest in _____ at 25°C. 

Which of the given metals cannot be extracted using smelting? 

Starch in potatoes reacts with _____, turning to a blue colour. 

Which of the following is a Lewis base?

Read the following questions carefully and answer them. 

“All the four quantum numbers of two electrons in an atom are not the same.” It is the law of —