CH2 IS MATTER AROUND US PURE

Which of the following is a compound? a) Nitrogen (N2) b) Hydrogen (H2) c) Methane (CH4) d) Helium (He)

Sol and gel are examples of —————— (a) Solid-solid colloids (b) Sol is a solid-liquid colloid and gel is liquid-solid colloid (c) Sol is solid- solid colloid and gel is solid-liquid colloid (d) Sol is a liquid-solid colloid and gel is a

Solid solution in which the solute is gas ———– (a) Copper dissolved in gold (b) Camphor in nitrogen gas (c) Solution of hydrogen in palladium (d) All of the above

Which of the following is not a homogeneous mixture? (a) Air (b) Tincture of iodine (c) Sugar solution (d) milk

Which of the following is not a pure substance? a) Water b) Air c) Diamond d) Gold

1.What is true about homogeneous mixture? (a) Homogeneous mixture is the mixture of two or more than two components. (b) In homogeneous mixture the composition and properties are uniform throughout the mixture (c) both (a) and (b) are tr

Compounds can be broken down into simpler substances by: a) Chemical methods only b) Physical methods only c) Both chemical and physical methods d) Neither chemical nor physical methods

. In the tincture of iodine, find the solute and solvent? (a) alcohol is the solute and iodine is the solvent (b) iodine is the solute and alcohol is the solvent (c) any component can be considered as solute or solvent (d) tincture of i

An example of liquid metal and liquid non-metal is (a) Gallium, mercury (b) Mercury, chlorine (c) Mercury, bromine (d) Bromine, sulphur

Q: Which of the following is an example of a suspension? a) Saltwater b) Lemonade c) Sand and water d) Milk

Which of the following is true about compounds? a) They can exist as a single atom. b) They have a fixed composition. c) They can be separated into elements by physical methods. d) They are always gases at room temperature.

An element is made up of: a) Two or more types of atoms chemically combined. b) Two or more elements chemically combined. c) A single type of atom. d) A single type of molecule.

Which of the following properties does not describe a compound? (a) It is composed of two or more elements (b) It is a pure substance. (c) It cannot be separated into constituents by physical means (d) It is mixed in any proportion by m

Gelatin, used in making jellies, is an example of which type of mixture? a) True Solution b) Colloidal Solution c) Suspension d) None of the above

Which of the following mixtures is stable and does not separate on standing? a) True Solution b) Colloidal Solution c) Suspension d) None of the above

Q: Which of the following is an example of an element? a) Water (H2O) b) Carbon dioxide (CO2) c) Oxygen (O2) d) Salt (NaCl)

What is the statement? “10 percent glucose in water by mass” signifies. (a) 10 gram of glucose dissolved in 100 gram of water. (b) 10 gram of glucose dissolved in 90 gram of water. (c) 20 gram of glucose dissolved in 200 gram of water.

Which of the statements is incorrect about the physical change? (a) There is no gain or loss of energy. (b) It is permanent and Irreversible (c) Composition of the substance remains the same (d) No new substance is formed.

In a true solution, the solute particles are: a) Large and visible b) Medium-sized and dispersed c) Very small and evenly distributed d) Not uniformly mixed

Which of the following mixtures is the most stable and does not separate even on prolonged standing? a) True Solution b) Colloidal Solution c) Suspension d) None of the above

Which of the following methods can be used to separate a suspension? a) Evaporation b) Filtration c) Distillation d) Tyndall effec