List of top Chemistry Questions asked in PGIMER

The hardest form of carbon is:
The most important ore of aluminium is:
The reaction CH3-CHO + H2NOH gives an oxime and H2O. This reaction is an example of a/an:
The number of electrons present in H+ is:
The hottest part of a gas flame is the:
The element present in the highest proportion (about 65% by mass) in the human body is:
The type of isomerism that exists between CH3CHCl2 and CH2Cl-CH2Cl is:
A radioactive isotope has a half-life of 2 hours. The fraction of the original sample remaining after 6 hours is:
An electron is present in an orbit for which the maximum value of the magnetic quantum number is m = +3. The number of de Broglie waves this electron makes in one complete revolution around the nucleus is:
The number of atoms in 21.6 g of Ag (atomic mass of Ag = 108) is equal to the number of molecules present in:
The National Chemical Laboratory (NCL) is situated in:
Equal masses of O2, H2 and CH4 are kept under identical conditions of temperature and pressure. The ratio of the volumes occupied by them is:
The mass number of an atom is equal to the:
The high reactivity of fluorine among the halogens is mainly due to:
The iron ore magnetite consists of:
If the ionisation energy of hydrogen in its ground state is x kJ per mole, the energy needed for an electron to jump from n = 2 to n = 3 is:
The major constituent of air (by volume) is:
The main chemical constituent of clay is:
The mineral that contains both magnesium and calcium is:
Which of the following methods cannot remove the permanent hardness of water?
Based on their half life, which of the following radioisotopes is most dangerous to handle?
The gas used for artificial ripening of green fruit is:
Zone refining is used for the purification of:
The main chemical constituent responsible for the flavour of cardamom oil is:
Among the following molecules, the one with the highest percentage of ionic character is: