The hottest part of the gas flame is known as:
How many normal modes of vibrational are possible for a benzene molecule?
Which one is an organic Acid ?
The graphite rods in the nuclear reactor:
Unreactive non metals are called. ____________ .
The items amenable to detection by soft x-rays are:
Lattice energy of an ionic compounds depends upon:
Phenyl magnesium bromide reacts with methanol to give:
An electron changes its position from n= 2 to the or bit n = 4 of an atom. The wave length of the emitted radiations is (R = Rydberg’s constant)
Sugars are converted in the liver into:
Which among the following element is an essential constituent of acids?
Zone refining is used for the purification of:
The main chemical constituent of clay is:
The number of waves made by an electron moving in an orbit having maximum magnetic quantum number is +3:
Lodine can be separated from a mixture of Iodine and Potassium Chloride by ?
The nucleus of an atom consists of:
As per Bohr model, the minimum energy (in eV ) required to remove an electron from the ground state of doubly ionized Li atom (Z = 3 ) is:
The synthesis of alkyl fluorides is best accomplished by :
How many EDTA (ethylenediaminetetraacetic acid) molecules are required to make an octahedral complex with a Ca2+ ion?
Which of the following is an alkaline earth metal?
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:
The luster of a metal is due to :
Fluorobenzene (C6H5F) can be synthesized in the laboratory:
The gas used for artificial ripening of green fruit is ?
In a sample of ethyl ethanoate (CH3COOC2H5) the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it?
The acid generally stored in batteries is:
The molecular formula of phosphorous is:
Which of the following pairs are correctly matched?
(1) Isotopes : Atoms with same atomic number but different atomic mass.
(2) Isobars : Atoms with same number of neutrons but different atomic number.
(3) Isotones : Atoms with same mass number but different atomic number.
Select the correct answer using the codes given below :
The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is:
For a spontaneous change in a system at constant temperature and pressure, which of the following statements is true?