List of top Questions asked in PGIMER

Choose the incorrect statement:
The purest common form of iron is:
The metal that does not give H2 gas on treatment with dilute HCl is:
The number of gram-molecules (moles) of oxygen present in 6.02 x 1024 molecules of CO is:
The most extensive, commercially useful source of thorium as monazite sand occurs in India at the:
The main active constituent of tea and coffee is:
The maximum number of isomers possible for an alkene with molecular formula C4H8 is:
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: