List of top Chemistry Questions

Two atoms are said to be isobars if

Troutons rule gives the relation between

Tritium is a radioactive isotope of hydrogen. It emits

Tropospheric pollution is caused by gaseous air pollutants as well as particulate pollutants. Among the gaseous air pollutants, oxides of sulphur $(SO_x)$, oxides of nitrogen $(NO_x)$ and carbon monoxide play an important role towards pollution. Formation of acid rain and photochemical smog, greenhouse effect and global warming all are the result of various chemical and photochemical reactions taking place in the environment. Various particulates including viable and non-viable are also responsible for causing serious air pollution. The aromatic compounds present as particulates are

Triiodomethane has antiseptic property because of

Treatment of ethyl amine and methyl magnesium halide produces a gaseous substance X is

Transition metal with low oxidation number will act as

Transition metals make the most efficient catalysts because of their ability to

Traces of molybdenum are used with finely divided iron which acts as a catalyst during Haber?? process for synthesis of ammonia. The molybdenum

Tolerable limits of lead and fluoride in drinking water according to International Standards are respectively

To which class of dyes does Malachite green belong ?

To what temperature must a neon gas sample be if the initial volume of gas at 75$^\circ$C is decreased by 15.0% by coolingthe gas

To differentiate between pentan-$2$-one and pentan-$3$-one a test is carried out. Which of the following is the correct answer?

Tin and lead can be refined by

Time taken for an electron to complete one revolution in the Bohr orbit of hydrogen atom is

Threshold energy is equal to

Three samples of the same gas $ A, B $ and $ C (\gamma = 3/2) $ have equal volume initially. Now, the volume of each sample is doubled. For $ A $ , the process is adiabatic; for $ B $ , it is isobaric and for $ C $ , the process is isothermal. If the final pressure are equal for all the three samples, the ratio of their initial pressures is

Those substances can be separated by steam distillation which are

Thermodynamics is not concerned about______ .

Thermal stability of alkaline earth metal carbonates decreases in the order

There is a large number of carbon compounds due to

There are two sources of light, each emitting with a power of $100\, W$. One emits $X$-rays of wavelength $1 \,nm $ and the other visible light of $500\, nm$. The ratio of number of photons of $X$-rays to the photons of visible light of the given wavelength is

There are two rows of inner transition elements in the periodic table each containing $14$ elements. The reason for this may be

The work done in adiabatic process is given by Here, symbols have their usual meaning

The weakest interparticle forces are present in