JEE Questions for Chemistry Some Basic Concepts Of Chemistry Quiz 2 - MCQExams.com

The number of moles of KMnO4 reduced by one mole of KI in alkaline medium is:
  • one
  • two
  • five
  • one fifth
The same amount of Zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide. What will be the ratio of volumes of hydrogen evolved ?
  • 1 : 1
  • 1 : 2
  • 2 : 1
  • 9 : 4
2.76 g of silver carbonate on being strongly heated yields a residue weighing
  • 2.16g
  • 2.48 g
  • 2.32 g
  • 2.64 g
The molecular weight of O2 and SO2 are 32 and 64 respectively. At 15°C and 150 mm Hg pressure, one litre of O2 contains ‘N’ molecules. The number of molecules in two litres of SO2 under the same conditions of temperature and pressure will be :
  • N/2
  • N
  • 2N
  • 4N

Chemistry-Some Basic Concepts of Chemistry-7238.png
  • 10.8
  • 10.2
  • 11.2
  • 10.0
The number of gram molecules of oxygen in 6.02 × 1024 CO molecules is
  • 10 g molecules
  • 5 g molecules
  • 1 g molecules
  • 0.5 g molecules
What is the weight of oxygen required for the complete combustion of 2.8 kg of ethylene ?
  • 2.8 kg
  • 6.4 kg
  • 9.6 kg
  • 96 kg
The normality of 0.3M phosphorous acid is
  • 0.1
  • 0.9
  • 0.3
  • 0.6
At S.T.P. the density of CCl4 vapours in g/L will be nearest to :
  • 6.87
  • 3.42
  • 10.26
  • 4.57
An organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave C, 38.71% and H, 9.67%. The empirical formula of the compound would be :
  • CH3O
  • CH2O
  • CHO
  • CH4O
In which of the following pairs percent composition of element is not same ?
  • benzene and ethyne
  • But - 2 - ene and Cyclobutane
  • glucose and fructose
  • phenol and ethanol
What weight of CuO will be required to provide 200Kg copper
  • 200Kg
  • 79.5Kg
  • 250Kg
  • 100Kg
Impure sample of ZnS contains 42.34% Zn. What is the percentage of pure ZnS in the sample ?
  • 67%
  • 63%
  • 58%
  • 37%
Percentage of Se in peroxidase anhydrase enzyme is 0.5% by weight (at. wt. = 78.then minimum molecular weight of peroxidase anhydrase enzyme is
  • 1.568 × 103
  • 15.68
  • 2.136 × 104
  • 1.568 × 104
An organic compound containing C, H and O gave on analysis C – 40% and H – 6.66%. Its empirical formula would be
  • C3H6O
  • CHO
  • CH2O
  • CH4O
How much calcium oxide (CaO) can be obtained by heating 200 Kg of lime stone theat is 95% pure CaCO3 ?
  • 56Kg
  • 190Kg
  • 170Kg
  • 107Kg
Calculate the amount of NaOH required to neutralise 100 mL 0.1 M H2SO4
  • 40g
  • 0.4 g
  • 80 g
  • 0.8 g
3g of an oxide of a metal is converted into chloride and it yielded 5 g of chloride. Find the equivalent weight of the metal.
  • 33.25
  • 3.325
  • 12
  • 20
A compound contains two oxygen atoms, four carbon atoms and number of hydrogen atoms is double of carbon atoms. What is the density of vapour of this compound ?
  • 88
  • 44
  • 132
  • 72
An organic compound containing C, H and N gave the following analysis : C = 40% ; H = 13.33% ; N = 46.67% Its empirical formula would be
  • C2H7N2
  • CH5N
  • CH4N
  • C2H7N
Which one of the following statements is incorrect ?
  • All elements are homogeneous system
  • Compounds made up of a number of elements are heterogeneous.
  • A mixture is not always heterogeneous
  • Smoke is a heterogeneous mixture.
If the components of air are N2,78%, O2, 21% ; Ar, 0.9% and CO2, 0.1% by volume, what will be the molecular weight of air ?
  • 28.9
  • 32.4
  • 16.4
  • 14.5
In an experiment, 4 gm of M2Ox oxide was reduced to 2.8 gm of the metal. If the atomic mass of the metal is 56 gm/mol, the number of oxygen atoms in the oxide is
  • 1
  • 2
  • 3
  • 4
For a reaction A + 2B → C, the amount of C formed by starting the reaction with 5 moles of A and 8 moles of B is
  • 5 moles
  • 8 moles
  • 16 moles
  • 4 moles
An organic compound made of C, H, and N contains 20% nitrogen. Its molecular weight is
  • 70
  • 140
  • 100
  • 65
Calculate the number of moles in 1m3 gas at STP.
  • 4.46
  • 44.6
  • 446
  • 4460
Which of the following is not a homogeneous mixture ?
  • smoke
  • air
  • Brass
  • Aqueous solution of sugar
Which of the following has the largest number of atoms ?
  • 0.5g atom of Cu
  • 0.635g of Cu
  • 0.25 moles of Cu atom
  • 1 g of Cu
Specific volume of cylindrical virus particle is 6.02 × 10–2 cc/gm. whose radius and length 7 Å & 10 Å respectively. If NA = 6.02 × 1023, find molecular weight of virus
  • 3.08 × 103 kg/mol
  • 3.08 × 104 kg/mol
  • 1.54 × 104 kg/mol
  • 15.4 kg/mol
Four one–litre flasks are separately filled with the gases hydrogen, helium, oxygen and ozone at the same room temperature and pressure. The ratio of total number of atoms of these gases present in the different flasks would be
  • 1 : 1 : 1 : 1
  • 1 : 2 : 2 : 3
  • 2 : 1 : 2 : 3
  • 3 : 2 : 2 : 1
0:0:1


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