Class 11 Chemistry
Some Basic Concepts of Chemistry
Question1.
Mass of 120 cm3HCl(g) at S.T.P is
a. 0.55g
b. 0.031g
c. 0.08g
d. 1.2g
Question2.
How many of electrons has mass equal to 1 kilogram:
a. 6.022 x 1023
b. 19.108x 1031
c. 6.0229.108x 1054
d. 19.108 ×6.023 x 108
Question3.
In dibasic acid, C = 26.7%, H = 2.2% and O = 71.1% are present. Molecular mass of an acid is 90. Calculate the empirical and molecular formula.
Question4.
Calculate the price of salt and sugar is Rs.17 per Kg and Rs. 40 per Kg then calculate the price of their 1 mole.
Question5.
How many grams of iron should be made red hot to get 2.32g of Fe3o4 by passing water vapour? The atomic mass of Fe is 56 a.m.u and O = 16 a.m.u.
Question6.
(i) Calculate the amount of KClO3 required for producing 1.23g O2 ?
(ii) What amount of KCl is produced along with this oxygen ?
Question7.
A commercial sample of Sulphuric acid Contains 36% acid by mass. Find its molarity if its density is 1.19 g cm3.
Question8.
Calculate mass of one copper atom.
Question9.
Average atomic mass of magnesium is 24.31 amu. This magnesium is composed of 79 mol% of 24Mg and remaining 21 mol % of 25Mg and 26Mg. calculate Mole% of 26Mg.
Question10.
A sample of calcium carbonate (CaCO3) has the following percentage composition :
Ca = 40%, C= 12% and O= 48%. If the law of constant proportions is true, then the mass of calcium in 4g of a sample of calcium carbonate obtained from another source will be.
a. 0.16g
b. 1.6g
c. 16g
d. 0.016g
Question11.
Explain law of constant proportions and law of conservation of mass.
Question12.
Calculate the percentage of Pb and PbO can be calculated in Pb3O4 as follows:
Question13.
What is vapour density? Write down its relation with molecular mass.
Question14.
For the same volume of gas at NTP their
a. No. of molecules will be the same.
b. No. of atoms will be the same.
c. Masses will be the same.
d. Densities will be the same.
Question15.
On combustion of 2 mol of C2H5OH, the amount of CO2 obtained will be:
a. 58
b. 176
c. 88
d. 44
Question16.
What is the Berzelius hypothesis?
Question17.
What do you understand by limiting reagents?
Question18.
The Vapour density of a mixture containing NO2 and N2O4 is 38.3 at 270 . Calculate the moles of NO2 in 100g of mixture.
Question19.
Assume that the nucleus of the Q atom is a sphere of radius 12.04 x 10-6cm.Calculate the density of matter in Q nucleus .
(If atomic mass of Q = 24g)
Question20.
AVOGRAM is ________.
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All About Daily Practice Problems on Class 11 Chemistry Some Basic Concepts of Chemistry NCERT Chapter 1
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