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):
Following statements are made in connection with carbon dioxide (CO2)
(1) CO2 is a poisonous gas.
(2) CO2 is an acidic oxide.
(3) CO2 turns limewater milky.
Which of the statements given above is/are correct?
The intermolecular interaction that is dependent on the inverse cube of distance between the molecules is :
Which is not a type of elements ?
Consider the following statements and select the correct code.
Assertion (A): A chemical reaction becomes faster at higher temperature.
Reason (R): At higher temperature, molecular motion becomes more rapid.
Elimination of bromine from 2-bromobutane results in the formation of-
Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point.
What nucleus of atom contains ?
Which is used in preparation of dynamite ?
Which one among the following elements/ions is essential in small quantities for development of healthy teeth but causes mottling of the teeth if consumed in higher quantities?
Consider the following statements: Hard water is not suitable for
(1) Drinking
(2) Washing clothes with soap
(3) Use in boilers
(4) Irrigating crops
Which of these statements are correct?
Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy?
The inexhaustible source of energy of the stars is due to:
The half-life period of a rdaioactive element X is same as the mean life time of another radioactive element Y. Initially both of them have the same number of atoms. Then
Which of the primary component of natural gas?
Consider the spectral line resulting from the transition n = 2n = 1 in the atoms and ions given below. The shortest wave length is produced by:
Fast neutrons can easily be slowed down by:
The National Chemical Laboratory is situated in:
During a nuclea fusion reaction:
Acid rain is due to air pollution by ?
The electron in a hydrogen atom makes a transition from an excited state of state the ground Which of the following statements is true ?
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 ?
The compound that has the least value for octane number is :
One of the essential minerals in the human body is salt. How much salt (NaCl) is in the average adult human body?
The difference between a nuclear reactor and atomic bomb is that:
Hydrogen bomb is based on the principle of:
Phenol, when it first reacts with concentrated sulphuric acid and then with concentrated nitric acid, gives:
The oxide of Nitrogen used in medicine as anaesthetic is ?
The oil used in the froth floatation process is:
What is the general formula of Alkanes?