What is the maximum number of electrons the second energy level can hold?
Which of the following is correctly matched?
Which one of the following sets of elements was primarily responsible for the origin of life on the Earth?
The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?
All of the following are amino acids except:
Which one is an organic Acid ?
What products are expected from the disproportionation reaction of hypochlorous acid?
The blue colour of water in the sea. What is the reason behind the phenomenon?
Phenyl magnesium bromide reacts with methanol to give:
The nuclear particles which are assumed to hold the nucleons together are ?
Which of the following compounds will exhibit geometrical isomerism?
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:
Consider the ground state of Cr atom (Z = 24). The number of electrons with the azimuthal quantum numbers I =1 and 2 are respectively
In Langmuir’s model of adsorption of a gas on a solid surface:
The most important ore of aluminium is:
Which of the following is / are correct statements about Inert Gases?
(1) They have Zero Valency
(2) They don’t undergo chemical reactions
Select the correct option from the codes given below:
The high reactivity of fluorine is due to:
Which of the five isomeric hexanes, the isomer which can give two monochlorinated compounds?
2 methylbutane on reacting with bromine in the presence of sunlight gives mainly:
The shortest wavelength f X-rays emitted from an X-ray tube depends on:
Which of the statements given below is/are correct?
Permanent hardness of water is due to the presence of soluble.
(1) Chloride of calcium
(2) Bicarbonate of calcium
(3) Sulphate of magnesium
(4) Bicarbonate of magnesium
Select the correct answer using the codes given below.
Which one is an organic Acid ?
Which of the following is fully fluorinated polymer?
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.
Consider the following statements: Nitrogen is an essential constituent of
(1) Soils (2) Animals (3) Plants
Which of the statements given above is/are correct ?
X-ray beam coming from an X-ray tube will be:
Which of the following statements is always true for a liquid mixture of two components A and B in equilibrium with a mixture of their vapours?
The most malleable metal is :
Which of the following is also known as wood alcohol?
The hottest part of the gas flame is known as: