JEE Questions for Chemistry Some Basic Concepts Of Chemistry Quiz 1 - MCQExams.com

The number of oxygen atoms in 4.4 g of CO2 is
  • 1.2 × 1023
  • 6 × 1022
  • 6 × 1023
  • 12 × 1023
Gram molecular volume of oxygen at STP is
  • 3200 cm3
  • 5600 cm3
  • 22400 cm3
  • 11200 cm3
Which has maximum number of atoms?
  • 24 g of C
  • 56 g of Fe
  • 26 g of Al
  • 108 g of Ag
Which of the following has the smallest number of molecules ?
  • 0.1 mole of CO2 gas
  • 11.2 L of CO2 gas at STP
  • 22 g of CO2 gas
  • 22.4 X 103 mL of CO2 gas at STP
The maximum number of molecules are present in
  • 15 L of H2 gas at STP
  • 5 L of N2 gas at STP
  • 0.5 g of H2 gas
  • 10 g of O2 gas
4.6 x 1022 atoms of an element weigh 13.8 g. The atomic weight of that element is
  • 290
  • 180
  • 34.4
  • 10.4
Law of constant composition is same as the law of
  • conservation of mass
  • conservation of energy
  • multiple proportion
  • definite proportion
A molar solution is one that contains one mole of a solute in
  • 1000 g of the solvent
  • One litre of the solvent
  • One litre of the solution
  • 22.4 litres of the solution
1 mol of CH4 contains
  • 6.02 × 1023 atoms of H
  • 4 g atoms of hydrogen
  • 1.81 × 1023 molecules of CH4
  • 3.0 g of carbon
The density of gas A is three times that of gas B. If the molecular weight of A is M, the molecular weight of B is
  • 3 M
  • 2)
    Chemistry-Some Basic Concepts of Chemistry-7265.png
  • M/3

  • Chemistry-Some Basic Concepts of Chemistry-7266.png
The maximum number of molecules is present in
  • 15 L of H2 gas at STP
  • 5 L of N2 gas at STP
  • 0.5 g of H2 gas
  • 10 g of O2 gas
How many significant digits are there in 0.25 ?
  • 1
  • 2
  • 3
  • cannot be determined.
Which of the following has smallest number of molecules?
  • 0.1 mol of CO2 gas
  • 11.2 L of CO2 gas at N.T.P
  • 22g of CO2 gas
  • 22.4 × 103 ml of CO2 gas
The number of gram molecules of chlorine in 6.02 x 1025 hydrogen chloride molecules is
  • 10
  • 100
  • 50
  • 5
If NA is Avogadro’s number then number of valence electrons in 4.2g of nitride ions (N3–) is
  • 2.4 NA
  • 4.2 NA
  • 1.6 NA
  • 3.2 NA
In an experiment it showed that 10 mL of 0.05 M solution of chloride required 10 mL of 0.1 M solution of AgNO3, which of the following will be the formula of the chloride (X stands for the symbol of the element other than chlorine):
  • X2Cl
  • X2Cl2
  • XCl2
  • XCl4

Chemistry-Some Basic Concepts of Chemistry-7228.png
  • 33.65 %
  • 32.56 %
  • 23.65 %
  • 22.65 %
1 L oxygen gas at STP will weigh
  • 1.43 g
  • 2.24 g
  • 11.2 g
  • 22.4 g
6.02 × 1020 molecules of urea are present in 100 mL of its solution. The concentration of solution is :
  • 0.01 M
  • 0.001 M
  • 0.1 M
  • 0.02 M
Haemoglobin contains 0.334% of iron by weight. The molecular weight of haemoglobin is approximately 67200. The number of iron atoms (at. wt. of Fe ispresent in one molecule of haemoglobin are
  • 1
  • 6
  • 4
  • 2
Which has maximum number of atoms ?
  • 24g of C (12)
  • 56g of Fe(56)
  • 27g of Al (27)
  • 108g of Ag (108)
What volume of hydrogen gas at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g of elemental boron (atomic mass = 10.form the reduction of boron trichloride by hydrogen
  • 89.6 L
  • 67.2 L
  • 44.8 L
  • 22.4 L

Chemistry-Some Basic Concepts of Chemistry-7233.png
  • 1
  • 2
  • 3
  • 4
What is the mass of precipitate formed when 50 mL of 16.9% solution of AgNO3 is mixed with 50 mL of 5.8% NaCl solution ?

(Ag = 107.8, N = 14, O = 16, Na = 23, Cl = 35.5)
  • 28 g
  • 3.5 g
  • 7 g
  • 14 g
The number of atoms in 0.1 mol of a triatomic gas is : (NA = 6.02 ×1023 mol-1)
  • 6.026 × 1022
  • 3.600 × 1023
  • 1.806 × 1023
  • 1.800 × 1022
What volume of oxygen gas (O2) measured at 0°C and 1 atm, is needed to burn completely 1L of propane gas (C3H8) measured under the same conditions ?
  • 5 L
  • 6 L
  • 7 L
  • 10 L
The drug which is used for treating AIDS victims is
  • Azidothymidine
  • Cis- platin
  • Taxol
  • All of these
Number of moles of MnO4 required to oxidize one mole of ferrous oxalate completely in acidic medium will be :
  • 0.6 moles
  • 0.2 moles
  • 7.5 moles
  • 0.4 moles
Volume occupied by one molecule of water (density = 1 g cm–3) is :
  • 9.0 × 10–23 cm3
  • 6.023 × 10–23 cm3
  • 5.5 × 10–23 cm3
  • 3.0 × 10–23 cm3
An element, X has the following isotopic composition :
Chemistry-Some Basic Concepts of Chemistry-7235.png
  • 201 amu
  • 202 amu
  • 199 amu
  • 200 amu
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