What is extracted from Bauxite ?
Electrons with energy 80 keV are incident on he tungsten target of an X-ray tube. K-shell electrons of tungsten have - 72.5 contain only k.v energy. X-rays emitted by the tube:
What products are expected from the disproportionation reaction of hypochlorous acid?
Due to rusting the weight of iron:
How many nearest neighbours are there for an atom in a hexagonal close-packed crystal structure?
What does the airbag, used for safety of car driver, contain?
Which among the following element is an essential constituent of acids?
Who is regarded as father of modern chemistry ?
The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is:
Homo nuclear molecules contain ?
Which among the following acids is abundant in Grapes, Bananas and Tamarind?
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.
The blue colour of water in the sea. What is the reason behind the phenomenon?
The lanthanide contraction is responsible for the fact that:
On a pressure-temperature phase diagram, the conditions under which a one-component system exists as two phases in equilibrium corresponds to:
The heat energy produced when the human body metabolises 1 gram of fat is:
The main chemical constituent of clay is ?
The pyrimidine bases present in DNA are:
Which gas is filled in refrigerators ?
Three of the most common states of matter are solids, liquids, and gases. A liquid has:
The vapour pressure of toluene is 6.811 kPa at 310 K and 24.15 kPa at 340 K. Assuming that the variation of the vapour pressure p with temperature T may be described by the expression What are the values of A and B?
Which one of the following is the correct statement?
The metal used to recover copper from a solution of copper sulphate is ?
Which is also called Stranger Gas ?
Which one of the following is not correct?
Bring out the only correct statement in context with Uranium:
The number of electrons presents in H+ is:
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:
Horizontal rows in the periodic table are called ___________.