Is Matter Aroun...

What will be the boiling point of water at the top of a mountain where the atmospheric pressure is less than 1 atm?

Match the following with correct response.

(1) Separation of cream from milk
(2) Separation of oil from water
(3) Separation of pigment from natural colours
(4) Separation of components of air

(A) Separating funnel
(B) Fractional distillation
(C) Chromatography
(D) Centrifugation

Match the following with correct response.

(1) Separation of ammonium chloride from salt
(2) Separation of salt from water
(3) Separation of sand & iron fillings
(4) Separation of benzene & toluene

(A) Sublimation
(B) Magnetic separation
(C) Evaporation
(D) Fractional distillation

Match the following with correct response.

(1) Fine mud particles suspended in water
(2) Purification of water
(3) Small pieces of metal in engine of a car
(4) Tea leaves from tea extract

(A) Centrifugation
(B) Loading & sedimentation
(C) Filtration
(D) Chlorination

Which of the two statements is true?

Statement A: Brass is a solution while gun powder is not.
Statement B: Air represents a solution in terms of science.

Find the incorrect statement

Which one is physical change?

Which of the following are chemical changes?

What happens on adding dilute HCl to a mixture of iron filling and sulphur powder?

(a) H₂S is formed.
(b) A colour less and odourless gas is formed.
(c) A greenish solution appears.
(d) FeS is formed.

Which of the following statements are incorrect

A) The properties of a compound are different from its constituents elements
B) A mixture is homogenous but a compound is heterogeneous
C) Formation of a compound is a chemical change
D) Formation of a mixture is a chemical change