Is matter around us pure?

Is matter around us pure?

Quiz

 

1. What is the name of the metal which exists in liquid state at room temperature?
   1.   Sodium
   2.   Potassium
   3.   Mercury
   4.   Bromine
2. Which of the following elements is not a metalloid?
   
   1.   Boron
   2.   Silicon
   3.   Germanium
   4.   Tungsten
3. If we put camphor in an open container, its amount keeps on decreasing due to the phenomenon of
   1.   Evaporation
   2.   Precipitation
   3.   Condensation
   4.   Sublimation
4. Heterogeneous mixture in which the solute particles do not dissolve and remain suspended throughout the solvent and the solute particles can be seen with the naked eye is known as:
   1.   Colloidal solution
   2.   Super saturated solution
   3.   Sublimation
   4.   Suspensions
5. In tincture of iodine, find the solute and solvent?
   1.   alcohol is the solute and iodine is the solvent
   2.   iodine is the solute and alcohol is the solvent
   3.   any component can be considered as solute or solvent
   4.   tincture of iodine is not a solution
6. The continuous zig-zag movement of colloidal particles in a dispersion medium is called
   1.   Dispersion
   2.   Tyndall effect
   3.   Brownian movement
   4.   Oscillation
7. 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
   1.   a compound
   2.   an element
   3.   a molecule
   4.   a mixture
8. Which of the following non-metal is a good conductor of electricity?
   1.   Aluminium
   2.   Silicon
   3.   Graphite
   4.   Gold
9. Which of the following property does not describe a compound?
   1.   It is composed of two or more elements
   2.   Silicon
   3.   Graphite
   4.   Gold
10. When two liquids do not mix, they form two separate layers and are known as
    1.   Miscible liquids
    2.   Immiscible liquids
    3.   Saturated liquids
    4.   Super saturated liquids
11. The amount of solute present per unit volume or per unit mass of the solution/solvent is known as
    1.   Composition of solute
    2.   Concentration of a solvent
    3.   Concentration of a solute
    4.   Concentration of a solution
12. According to the definition of pure substance, which of the following is a pure substance?
    1.   Ice
    2.   Mercury
    3.   Iron
    4.   All of these
13. The Rusting Of An Iron Object Is Called:
    1.   Corrosion and it is a physical as well as a chemical change
    2.   Dissolution and it is a physical change
    3.   Corrosion and it is a chemical change
    4.   Dissolution and it is a chemical change
14. A Mixture Of Sulphur And Carbon Disulphide Is:
    1.   Heterogeneous and shows Tyndall effect
    2.   Homogeneous and shows Tyndall effect
    3.   Heterogeneous and does not show Tyndall effect
    4.   Homogeneous and does not show Tyndall effect
15. Which Of The Following Statement Is Or Are Correct?
    1.   Metals can be beaten into thin sheets with the hammer without breaking.
    2.   Metals can be drawn or stretched into thin wires.
    3.   Metals allow heat and electricity to pass through them easily.
    4.   All of the above
16. In A Quiz Competition, You Are Asked A Question Where You Have To Choose The Statement Which Is/ Are Incorrect?
    1.   The electric wires are made of copper and Aluminium metals because they are very good conductors of electricity.
    2.   Only one metal, mercury, is in liquid state at room temperature.
    3.   Metal gallium has a such a low melting point that it starts melting in hand by the heat of our body.
    4.   Sodium and potassium metals have high densities than iron.
17. Which Of The Following Statements Are True For Pure Substances?
    1.   Pure substances contain only one kind of particles, pure substances may be compounds or mixtures.
    2.   Pure substances contain only one kind of particles; pure substances have the same composition throughout
    3.   Pure substances have the same composition throughout, pure substances can be exemplified by all elements other than nickel.
    4.   Pure substances may be compounds or mixtures, pure substances have the same composition throughout.