List of top Chemistry Questions on General Chemistry asked in WBJEE

For a chemical reaction, half-life period ($t_{1/2}$) is 10 minutes. How much reactant will be left after 20 minutes if one starts with 100 moles of reactant and the order of the reaction be (i) zero, (ii) one and (iii) two?
How many oxygen atoms are present in 0.36 g of a drop of water at STP?
The bond order of HeH$^+$ is
How many electrons are needed to reduce N$_2$ to NH$_3$?
Which of the following oxides is paramagnetic?
What is the four-electron reduced form of O$_2$?
Identify the correct statement(s):