Table of Contents
One Mark questions with answers
1. What is the significant figures in 1.050 x 104?
Ans. Four
2. What is the S.I. unit of Density?
Ans. Kg m-3
3. What do mean by Mole fraction?
Ans. Mole Fraction is the
ratio of number of moles of one component to the total number of moles
(solute and solvents) present in the solution. It is expressed as
'x'.
4. Round off up to 3 significant figure (a) 1.235 (b) 1.225 Ans. (a) 1.24 (b) 1.22
5. What is AZT?
Ans. Azidothymidine.
6. What is limiting reagent?
Ans.The reactant which gets consumed first or limits the amount of product formed is known as limiting reagent
7. Define one mole?
Ans. One mole is
the amount of a substance that contains as many particles as there are
atoms in exactly 12 g of the carbon-12.
8. Calculate the formula mass calcium chloride.
Ans. Formula mass of CaCl2= 40+2 x35.5=40+71 =
u
9.What is the law
called which deals with the ratios of the volumes of the gaseous
reactants and products?
Ans. Gay Lussac’s law of
gaseous volumes.
Two Marks questions with answers
1. Give the two
points of differences between homogeneous and heterogeneous
mixtures.
Ans.
|
Homogeneous
mixture |
Heterogeneous
mixture |
|
1. Homogeneous mixtures have the same composition throughout
the sample. 2. The components of such mixtures cannot be seen under a
powerful microscope. |
1. Heterogeneous mixtures consist of two or more parts (phases),
which have different compositions. 2. These mixtures have visible boundaries of separation between
the different constituents and can be seen with the naked
eye |
2. What is the difference between 160 cm and 160.0 cm
Ans. 160 has three significant figures while 160.0 has four significant figures. Hence, 160.0 represents greater accuracy