JEE Questions for Chemistry Some Basic Concepts Of Chemistry Quiz 7 - MCQExams.com

One mole of CO2 contains
  • 3 g atoms of CO2
  • 18.1 x 1023 molecules of CO2
  • 6.02 x l023 atoms of O
  • 6.02 x1023 atoms of C
1.0 g of magnesium is burnt with 0.56 g O2 in a closed vessel. Which reactant is left in excess and how much ? (At. wt. Mg = 24 ; O = 16)
  • Mg, 0.16 g
  • O2, 0.16 g
  • Mg, 0.44 g
  • O2, 0.28 g
Which of the following contains greatest number of oxygen atoms ?
  • 1 g of O
  • 1 g of O2
  • 1 g of O3
  • All have the same number of atoms
The number of hydrogen atoms present in 25.6 g of sucrose (C12H22O11 ) which has a molar mass of 342.3 g is
  • 22 x 1023
  • 9.91 x 1023
  • 11 x 1023
  • 44 x 1023
The number of formula units of calcium fluoride, CaF2 present in 146.4 g of CaF2 (the molar mass of CaF2 is 78.08 g/mol) is
  • 1.129 × 1024 CaF2
  • 1.146 × 1024 CaF2
  • 7.808 × 1024 CaF2
  • 1.877 × 1024 CaF2
Mass of 0.1 mole of methane is
  • 1 g
  • 16 g
  • 1.6 g
  • 0.1 g
80 g of oxygen contains as many atoms as in
  • 80 g of hydrogen
  • 1 g of hydrogen
  • 10 g of hydrogen
  • 5 g of hydrogen
0.1 mole of a carbohydrate with empirical formula CH2O contains 1 g of hydrogen. What is its molecular formula ?
  • C5H10O5
  • C6H12O6
  • C4H8O4
  • C3H6O3
  • C2H4O2
Number of atoms of He in 100 u of He (atomic weight of He isare
  • 25
  • 100
  • 50
  • 100 x 6 x 10-23
Assertion (A) Equal moles of different substances contain same number of constituent particles.
Reason (R) Equal weights of different substances contain the same number of constituent particles.
The correct answer is
  • Both A and R are correct and R is the correct explanation of A
  • Both A and R are correct but R is not the correct explanation of A
  • A is correct, but R is incorrect
  • A is incorrect, but R is correct
The value of amu is which of the following ?
  • 1.57 x 10-24 kg
  • 1.66 x 10-24 kg
  • 1.99 x 10-25 kg
  • 1.66 x 10-27 kg
How many moles of magnesium phosphate, Mg3 (PO4)2 will contain 0.25 mole of oxygen atoms ?
  • 0.02
  • 3.125 x 10-2
  • 1.25 x 10-3
  • 2.5 x 10-2
The mass of 112 cm3 of CH4 gas at STP is
  • 0.16 g
  • 0.8 g
  • 0.08 g
  • 1.6 g
The total number of protons in 10 g of calcium carbonate is
(N0 = 6.023 x 1023)
  • 3.01 x 1024
  • 4.06 x 1024
  • 2.01 x 1024
  • 3.02 x 1024
The mass of 1 mole of electrons is
  • 9.1 x 10-28 g
  • 1.008 mg
  • 0.55 mg
  • 9.1 x 10-27 g
Which of the following is correct for
C(graphite) + O2 → CO2 , Heat = - 348 kJ ?
  • Heat absorbed
  • Mass of product > Mass of reactant
  • Mass of product < Mass of reactant
  • Mass of product = Mass of reactant
A signature, written in carbon pencil weighs 1 mg. What is the number of carbon atoms present in the signature ?
  • 5.02 x 1023
  • 5.02 x 1020
  • 6.02 x 1020
  • 0.502 x 1020
How many moles of Al2 (SO4)3 would be in 50 g of the substance ?
  • 0.083 mol
  • 0.952 mol
  • 0.481 mol
  • 0.140 mol
The number of molecules of CO2 present in 44 g of CO2 is
  • 6.0 × 1023
  • 3 × 1023
  • 12 × 1023
  • 3 × 1010
2 g of O2 at 0oC and 760 mm of Hg pressure has volume
  • 1.4 L
  • 2.8 L
  • 11.2 L
  • 22.4 L
Number of atoms in 560 g of Fe (atomic mass 56 g mol-1) is
  • twice that of 70 g N
  • half that of 20 g H
  • Both are correct
  • None of the above
The equivalent mass of Fe in FeO is
  • 56
  • 28
  • 36
  • 18.66
0.56 g of a gas occupies 280 cm3 at NTP, then its molecular mass is
  • 4.8
  • 44.8
  • 2
  • 22.4
A compound has the molecular formula, X4O6. If 10 g of X4O6 has 5.72 g X , then calculate atomic mass of X.
  • 32 u
  • 64 u
  • 67 u
  • 98 u
The equivalent mass of a certain bivalent metal is 20. The molecular mass of its anhydrous chloride is
  • 111
  • 55.5
  • 75.5
  • 91
The equivalent weight of K2Cr2O7 in acidic medium is expressed in terms of its molecular weight (M) as

  • Chemistry-Some Basic Concepts of Chemistry-7429.png
  • 2)
    Chemistry-Some Basic Concepts of Chemistry-7430.png

  • Chemistry-Some Basic Concepts of Chemistry-7431.png

  • Chemistry-Some Basic Concepts of Chemistry-7432.png

Chemistry-Some Basic Concepts of Chemistry-7434.png
  • 16.89
  • 32.22
  • 84.45
  • 28.15
  • 29.7
2 g of metal carbonate is neutralised completely by 100 mL of 0.1N HCl. The equivalent weight of metal carbonate is
  • 50
  • 100
  • 150
  • 200
If the molecular weight of Na2S2O3 and I2 are M1 M2 respectively, then what will be the equivalent weight of Na2S2O3 and I2 in the following reaction ?
Chemistry-Some Basic Concepts of Chemistry-7437.png
  • M1 , M2
  • M1 , M2/2
  • 2M1 , M2
  • M1 , 2M2
The equivalent weight of KMnO4 for acid solution is
  • 79
  • 52.16
  • 158
  • 31.6
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