Self Studies
Self Studies
Self Studies
Self Studies

Is Matter Around Us Pure Test - 52

Result Self Studies

Is Matter Around Us Pure Test - 52
  • Score

    -

    out of -
  • Rank

    -

    out of -
TIME Taken - -
Self Studies

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Self Studies Self Studies
Weekly Quiz Competition
  • Question 1
    1 / -0
    Fractional distillation can be used to separate components of air by:
  • Question 2
    1 / -0
    The first step in fractional distillation relies on :
    Solution
    During fractional distillation, air is initially filtered to remove dust and then cooled and compressed in stages until it reaches 200$$^oC$$. At this temperature, it is a liquid. It is said that the air has been liquefied.
  • Question 3
    1 / -0
    Crystals of pure copper sulphate are separated from the solution by :
    Solution
    Crystal of pure copper sulphate can be obtained from an impure sample by re-crystallization. In re-crystallisation of copper sulphate the impure sample is dissolved in water, heated, and then cooled which then later forms pure crystals. These copper sulphate crystals are then separated by the filtration method.
  • Question 4
    1 / -0
    Which of the following is a compound?
    Solution
    Stainless steel and bronze are alloys, hence are homogenous mixtures.
    Graphite is pure carbon, hence is an element.
    Hydrogen sulphide is made up of hydrogen and sulphur in a fixed ratio and has only one type of molecule($$H_2S$$) throughout. Therefore it is a compound.
  • Question 5
    1 / -0
    Common salt can be purified by a process of :
    Solution
    Common salt obtained from seawater is an impure substance having many impurities. This common salt can thus be purified by crystallization.
  • Question 6
    1 / -0
    Salt, sugar, and many other substances dissolve in water to form:
    Solution
    A mixture is a material system made up of two or more different substances which are mixed but not combined chemically. 
    A homogeneous mixture is a type of mixture in which the composition is uniform and every part of the solution has the same properties. 
    Salt, sugar, and many other substances dissolve in water to form homogeneous mixtures.
    Hence, option A is correct.
  • Question 7
    1 / -0
    Crystallization is a process of :
    Solution
    Crystallization is the process of cooling a hot, saturated solution of a substance to obtain crystals. It is used to obtain pure solid from the impure sample. Hence option B is correct.
  • Question 8
    1 / -0
    The process of _________ is used to separate the component from a solid-solid mixture which _________ on heating and the other component being non-volatile.
    Solution
    The process of sublimation is used to separate the component from solid-solid mixture which sublimes on heating and the other component being non-volatile.
  • Question 9
    1 / -0
    Energy is given off or absorbed in case of:
    Solution
    When a compound is formed, energy is given off or absorbed but when a mixture is formed, no energy is given off or absorbed. Mixtures can be created by mechanical means, while the creation of a compound is dependent on a chemical reaction.
  • Question 10
    1 / -0
    Copper sulphate dissolved in water can be recovered as solid by:
    Solution
    Evaporation is used to separate a soluble solid from a liquid. Copper sulphate crystals dissolve in water to form a copper sulphate solution. During evaporation, the water evaporates away leaving solid copper sulphate crystals behind.

    Filteration cannot be used as the copper crystals are very small and can easily pass through the pores of the filter paper along with the water.

    The centrifugation technique is used when there is a difference in the densities of the solute and solvent particles, but in the case of a true solution, it's not the case. Hence, it can't be used.
Self Studies
User
Question Analysis

  • Correct -

  • Wrong -

  • Skipped -

My Perfomance
  • Score

    -

    out of -
  • Rank

    -

    out of -
Re-Attempt Weekly Quiz Competition
Self Studies Get latest Exam Updates
& Study Material Alerts!
No, Thanks
Self Studies
Click on Allow to receive notifications
Allow Notification
Self Studies
Self Studies Self Studies
To enable notifications follow this 2 steps:
  • First Click on Secure Icon Self Studies
  • Second click on the toggle icon
Allow Notification
Get latest Exam Updates & FREE Study Material Alerts!
Self Studies ×
Open Now