A reaction involving two different reactants can never be:
The metallurgical process in which a metal is obtained in a fused state is called:
During the process of electrolytic refining of copper, some metals present as impurity settle as ‘anode mud’ These are:
Assertion : Nitrogen and Oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen.
Reason : The reaction between nitrogen and oxygen requires high temperature.
The term PVC used in the plastic industry stands for:
The number of ____________ is equal to number of ____________ in its nucleus.
The mineral containing both magnesium and calcium is:
If the kinetic energy of a free elect on doubles, its de-Broglie wavelength changes by the factor:
In the hooch tragedy (casualty occurring due to the wine poisoning) sometimes the incidents of blindness occurs due to the poisonous substance:
Which of the following is an alkaline earth metal?
Who proposed first atomic theory ?
Which of the following is fully fluorinated polymer?
Equimolar solutions in the same solvent have
The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively, which of the following statements is NOT correct?
Which among the following gas was leaked at Bhopal during the Bhopal gas tragedy at 2-3 December 1984?
The molecule which has the highest percentage of ionic character among the following is:
The lowest energy level fills with ____________ first.
In the manufacture of Vanaspati ghee from vegetable oils, which among the following gas is used?
2,4-D, which is sold as a weed killer of the broad-leaved weeds is a synthetic version of ____________:
The main chemical constituent of clay is:
Consider the following statements :
(1) An alloy is a mixture of two or more metals.
(2) An alloy is a mixture of a metal or metals with a non-metal.
Which of the statements given above is/are correct ?
Which of the following is correct?
The gas used for artificial ripening of green fruit is ?
Polyunsaturated fats have ____________.
The mass number of an atom is equal to:
Consider the following statements : (i) Washing soda on strong heating gives sodium oxide and carbon dioxide.
(ii) Plaster of Paris is obtained by heating gypsum at 373 K.
(iii) Bleaching powder is used for disinfecting drinking water.
Which of these statement(s) is/are correct ?
Consider the following statements : The purpose of adding sodium sulphate and sodium silicate to washing powder is -
(1) To keep washing powder dry
(2) To maintain the alkalinity of the powder which of these statements is/are correct ?
Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point.
The hardest form of carbon is: