The main pollutant of the leather tanneries in the waste water is due to the salt of:-

Ozone layer is more thick in:-

Which of the following is not  a function of sulphur:-

Which aldehyde is most reactive:-

Among fluoride of xenon which is mild fluorinating agent:-

Critical temperature of a gas depends upon:-

The element which occur free in nature:-

The brown gas formed when metal reduces HNO3 is:-

The main process in the paper industry is:-

Colour of fluorescence produced by cathode rays depends upon:-

Which polymer is called polyamide:-

Period six in the periodic table contain which block elements:-

A solution of a compound of pH7 are pOH 7 is considered a

Fusion mixture is combination of :

Lind's method is employed for;-

Vitamin were discovered in

Which of the following process is alkaline:-

Colorof flame of sodium is:

All of the following are tri-atomic molecules except:

Which technique is based on the rate of reaction:-

The solution of which acid is used for seasoning of food;-

Which range of concentration is correct for semi micro analysis:-

CH₃-O_CH₃ is called ___?

Which one of the following is inorganic polymer:-

Which elements can produce H2 gas when treated with sodium hydroxide:-