class 9th can you pleas send
Answers
Answer:
1. What is the name of the metal which exists in liquid state at room temperature?
(a) Sodium
(b) Potassium
(c) Mercury
Answer: (c) Mercury
2. When the liquid is spun rapidly, the denser particles are forced to the bottom and the lighter particles stay at the top. This principle is used in:
(a) Centrifugation
(b) Fractional distillation
(c) Evaporation
(d) Tunneling
Answer: (a) Centrifugation
3. What is the name of the metal which exists in liquid state at room temperature?
(a) Mercury
(b) Bromine
(c) Sodium
(d) Potassium
Answer: (b) Bromine
Answer: (c) Mercury
2. When the liquid is spun rapidly, the denser particles are forced to the bottom and the lighter particles stay at the top. This principle is used in:
(a) Centrifugation
(b) Fractional distillation
(c) Evaporation
(d) Tunneling
Answer: (a) Centrifugation
3. What is the name of the metal which exists in liquid state at room temperature?
(a) Mercury
(b) Bromine
(c) Sodium
(d) Potassium
Answer: (b) Bromine
(a) Colloidal solution
(b) Super saturated solution
(c) Sublimation
(d) Suspensions
Answer: (d) Suspensions
7. In 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 iodine is not a solution
Answer: (b) iodine is the solute and alcohol is the solvent
8. The continuous zig-zag movement of colloidal particles in a dispersion medium is called
(a) Dispersion
(b) Tyndall effect
(c) Brownian movement
(d) Oscillation
Answer: (c) Brownian movement
9. A pure substance which is made up of only one kind of atom and cannot be broken into two or more simpler substances by physical or chemical means is referred to as
(a) a compound
(b) an element
(c) a molecule
(d) a mixture
Answer: (b) an element
10. Which of the following non-metal is a good conductor of electricity
(a) Aluminium
(b) Silicon
(c) Graphite
(d) Gold
Answer: (c) Graphite
11. Which of the following property 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 mass
Answer: (d) It is mixed in any proportion by mass
12. When two liquids do not mix, they form two separate layers and are known as
(a) Miscible liquids
(b) Immiscible liquids
(c) Saturated liquids
13. How one can separate ammonium chloride from a mixture containing ammonium chloride and sodium chloride?
(a) Precipitation
(b) Sublimation
(c) Chromatography
(d) Cetrifugation
Answer: (b) Sublimation
14. The amount of solute present per unit volume or per unit mass of the solution/solvent is known as
(a) Composition of solute
(b) Concentration of a solvent
(c) Concentration of a solute
(d) Concentration of a solution
Answer: (d) Concentration of a solution
15. According to the definition of pure substance, which of the following is a pure substance?
(a) Ice
(b) Mercury
(c) Iron
(d) All of these
Answer: (d) All of these
1. d
2. b
3. c
4. c
5. a
6. a
7. c
8. a
9. b
10. a
11. a
12. d