Which law states that "A pure chemical compound prepared by any method consists of the same elements combined together in a fixed proportion by mass" ?
Law of conservation of mass
Law of reciprocal proportions
Law of multiple proportions
Law of definite proportions
The presence of positively charged particles in the atom has been predicted by :
Neils Bohr
J.J. Thomson
Goldstein
Millikan
During any physical or chemical change takes place, the total mass of the matter remains:
Different
Zero
Same
None of these
Identify the wrong statement regarding the properties of cathode rays ?
Cathode rays are deflected towards the negatively charged plate.
Cathode rays are deflected perpendicular to the applied magnetic field when it passed through a magnetic field.
Cathode rays are made up of small particles.
Cathode rays travel in straight line.
In water, hydrogen and oxygen are in the ratio by mass :
1:8
8:1
2:3
3:2
According to ____________ matter is made up of small, indivisible particles called atoms.
Newton
Lavoisier
Dalton
Proust
Which one of the following is a wrong statement regarding the postulates of Dalton's atomic theory ?
Matter is made up of small indivisible particles called atom.
Atoms of same element are different in all respects.
Atoms of different elements are different in all respects.
Atom is the smallest particle that takes part in a chemical reaction.
Cathode rays are produced when high voltage is applied across a gas under :
High pressure
Low pressure
Very low pressure (0.1 mm of mercury)
Ordinary pressure
________ proposed that atom consists of a positively charged sphere where electrons are embedded in that sphere
Thomson
Bohr
Rutherford
During discharge tube experiment ,_______________ rays are emitted from the cathode.
Anode rays
Cosmic rays
Cathode rays
