1st Year Chemistry MCQS with Answers Chapter 2

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1st Year Chemistry MCQS with Answers


A filtration process could be very time consuming if it were not aided by a gentle suction, which is developed
If the paper has got small sized pores in it
If the stem of the funnel is large so that it dips into the filtrate
If the paper covers the funnel up to its circumference
If the paper fits tightly

NaCI and sand can be separated by one of the following without filtration
Formation of solution and filtration
Chromatiograghy
Sublimation
Formation of solution and evaporation without filtration

Which of the following precautions in necessary for smooth filtration
The tip of funnel should not touch the side of the beaker
The stem of the funnel should be very small
The filter paper should be of big size
The stem of he funnel should remain continuously full of liquid

One of the following substances does not undergo sublimation
Naphthalene
KMnO4
NH4CI
Iodine

The crystallization of a solid substance is done from a hot saturated solution. The solution is
Cooled rapidly to get excellent crystals
Evaporated rapidly
Mixed with another miscible solvent
Cooled very slowly to get good crystals

One of the following substances is not used as a drying reagent in a desiccator
Cons. H2SO4
50% KOH
P2O5
Silica gel

When i2present in the aquous layer in the form of I-13foes to CCI4layer, then the change in colour is from
Brown to purple
Purple to brown
Green to brown
Purple to green
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