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 blue colour of water in the sea. What is the reason behind the phenomenon?
2 methylbutane on reacting with bromine in the presence of sunlight gives mainly:
While tinning of brass utensils, the ammonium chloride powder used to clean the hot utensil produces fumes of:
Two solutions of a substance (non electrolyte) are mixed in the following manner. 480 ml of 1.5 M first solution + 520 mL of 1.2 M second solution. What is the molarity of the final mixture?
Which of the following is/are not caused due to Nitric oxide pollution?
(1) Leaf spotting in plants
(2) Bronchitis-related respiratory problems in human
(3) Production of corrosive gases through photochemical reaction
(4) Silicosis in human
For a spontaneous change in a system at constant temperature and pressure, which of the following statements is true?
The gas present in the stratosphere which filters out some of the sun's ultraviolet light and provides an effective shield against radiation damage to living things is:
The metal used to recover copper from a solution of copper sulphate is:
In Carius method of estimation of halogens, 250 mg of an organic compound gave 141 mg of AgBr. The percentage of bromine in the compound is(at. mass Ag = 108; Br = 80):
Why ethylene dibromide is added to petrol - (1) It increases the octane number of fuel
(2) It helps in elimination of lead oxide
(3) It removes the sulphur compound in petrol
(4) It serves as a substitute of tetraethyl lead:
Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being:
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:
Which one of the following pairs is correctly matched?
Contact lenses are made from ?
In cold weather, aquatic animals survive even when water to the top layer of the lake freezes into ice because:
Which of the following statements is always true for a system at equilibrium under conditions of constant temperature and pressure?
The intermolecular interaction that is dependent on the inverse cube of distance between the molecules is :
What products are expected from the disproportionation reaction of hypochlorous acid?
Which of the following is the best criteria of purity of organic compounds?
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:
The first metal used by man was:
Which of the following does not increase when we move from left to right along a period in the periodic table?
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:
Homo nuclear molecules contain ?
Atomic number of an element gives:
Which gas is filled in refrigerators ?
Permanent hardness of water is due to the presence of ?
Which among the following is the objective of the Methyl tert-butyl ether (MTBE) mixing with Petroleum?
What is Calcium sulphate ?