Ch – 6 Physical & Chemical Changes

Q.1: Properties such as size, shape, colour, etc. of a substance are called its ____________ properties. a) physical b) chemical c) both Q.2: The iron acquires a film of ____________ substance, when it gets rusted. a) greyish b) greenish c) brownish Q.3: Magnesium + Oxygen —-> _______________. a) Magnesium Oxygen b) Magnesium Oxide c) MagnesiumContinue reading “Ch – 6 Physical & Chemical Changes”

Ch – 5 Separation Of Substances

Q.1: The mixture in which the constituents are uniformly distributed and each part of the mixture has the same properties, is known as _________________ mixture. a) Homogeneous b) Heterogeneous c) None Q.2: The substances which are mixed to form a mixture are called ____________. a) constituents b) components c) Both Q.3: Which of the followingContinue reading “Ch – 5 Separation Of Substances”

Ch – 4 Structure Of The Atom ( Part 3 )

Q.1: ____________ are defined as the atoms of the same element, having the same atomic number, but different mass numbers. a) Isobars b) Isotopes c) Both Q.2: Each ___________ of an element is a pure substance. a) Isobar b) Isotope c) Both Q.3: An isotope of _____________ is used in the treatment of cancer. a)Continue reading “Ch – 4 Structure Of The Atom ( Part 3 )”

Ch – 4 Structure Of The Atom ( Part 2 )

Q.1: The distribution of electrons into different orbits of an atom was suggested by __________ and __________. a) Bohr, Bury b) Bohr, Rutherford c) Bohr, Thomson Q.2: The maximum number of electrons that can be accommodated in the outermost orbit is ________. a) 4 b) 6 c) 8 Q.3: The electrons present in the outermostContinue reading “Ch – 4 Structure Of The Atom ( Part 2 )”