Acid rain is due to air pollution by ?
To which orbitals may an electron in a 2p orbital in a hydrogenic atom make allowed spectroscopic transitions?
What is the degeneracy of the rotational energy level with J = 4 for a heteronuclear diatomic molecule?
A reaction was found to be second order with respect to the concentration of carbon monoxide. If the concentration of carbon monoxide is doubled, with everything else kept the same, the rate of reaction will:
What do metal atoms lose to form positively charged ions?
Which one of the following pairs of species have the same bond order?
A sample of chloroform before using as an anaesthetic, is tested by
In a solution of saltwater (a saline solution), salt is the:
The number of hydrogen atom(s) attached to phosphorus atom in hypophosphorous acid is:
Conduction band electrons have more mobility than holes because they are:
Which among the following is the objective of the Methyl tert-butyl ether (MTBE) mixing with Petroleum?
The molecular formula of phosphorous is:
Consider the following parts of spectra:
(1) Visible (2) Infrared (3) Ultraviolet (4) Microwave
Which of the following is the correct sequence in which the wavelengths increase?
-
-
-
-
How many different oxides are formed by nitrogen ?
The isotope atoms differ in ?
Which of the following do not contain nitrogen element?
(1) Superphosphate of lime
(2) Urea (3) Indian saltpeter
(4) Chille saltpeter
Reaction of trans-2-phenyl-1-bromocyclopentane on reaction with alcoholic KOH produces:
Lattice energy of an ionic compounds depends upon:
What is atomic number of an atom?
The number of moles of solute present in 1 kg of a solvent is called its:
Atomic number of an element gives:
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 ?
The Pauling electronegativities of fluorine and chlorine are 4.0 and 3.0 respectively. Estimate the dipole moment of chlorine monofluoride, ClF.
Reaction of cyclohexanone with dimethylamine in the presence of catalytic amount of an acid forms a compound if water during the reaction is continuously removed. The compound formed is generally known as:
Water drops are spherical because of ?
The metal does not give H2 on treatment with dilute HCL is:
The molecule which has the highest percentage of ionic character among the following is:
Until the nineteenth Century, aluminium was almost as expensive as gold. The invention of an inexpensive way to extract this metal by a 22-year-old American made this metal inexpensive subsequently. The inventor was:
Group 0 elements are ____________.
The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is: