What is the degeneracy of the rotational energy level with J = 4 for a heteronuclear diatomic molecule?
The lanthanide contraction is responsible for the fact that:
The isotope atoms differ in ?
When iron is left exposed in open air, it gets rusted. Which constituent(s) of air is /are responsible for rusting iron?
(1) Oxygen gas present in air
(2) Moisture present in air
(3) Carbon dioxide gas present in air
Select the correct answer using the codes given below :
Ions are charged particles that form when atoms ____________.
The ionic mobility of alkali metal ions in aqueous solution is maximum for:
You can't live without iron. Where in the body is most of the iron located?
Which of the following is an alkaline earth metal?
Bleaching action of chlorine is by ?
In which among the following categories, Radon (Rn) can be placed?
(1) Radioactive Element
(2) Inert Gas
(3) Noble Gas
Choose the correct option:
The metallurgical process in which a metal is obtained in a fused state is called:
The term anomers of glucose refers to:
Hydrogen bomb is based on the principle of:
The luster of a metal is due to:
Alloys made with mercury as one metal are called ?
Nail polish remover contains ?
The heat required to raise the temperature of body by 1 K is called:
Toluene is nitrated and the resulting product is reduced with tin and hydrochloric acid. The product so obtained is diazotised and then heated with cuprous bromide. The reaction mixture so formed contains:
“Atoms can neither be created nor destroyed.” This principle was given by ____________?
The intermolecular interaction that is dependent on the inverse cube of distance between the molecules is :
Consider the following statements and select the correct code.
Assertion (A): A chemical reaction becomes faster at higher temperature.
Reason (R): At higher temperature, molecular motion becomes more rapid.
If the binding energy of the electron in a hydrogen atom is 136 eV the energy required to remove the electron from the first excited state of Li++ is:
Chlorophyll molecules act as both donors and acceptors in fluorescence resonance energy transfer. The fluorescence lifetime of chlorophyll molecules in a dilute solution of an organic solvent wa found to be 1.2 ns. When chlorophyll molecules were instead embedded in a biopolymer, the fluorescence lifetime was measured to be 820 ps. Given that R0 = 5.6 nm for chlorophyll molecules, estimate the separation between the donor-acceptor pairs in the polymer.
The gas used for artificial ripening of green fruit is ?
The cyclotron is used to:
The most malleable metal is:
The metal that is usually extracted from sea water is:
The major component used in preparation of different types of glasses is :
A cylinder of volume 1810 dm3 contains gas at a pressure of 197 atm and temperature of 25°C. Assuming that the gas behaves as a perfect gas, calculate the amount of gas contained in the cylinder.