JEE Questions for Chemistry Some Basic Concepts Of Chemistry Quiz 3 - MCQExams.com

If 0.5 mol of BaCl2 is mixed with 0.2 mol of Na3PO4, the maximum number of moles of Ba3 (PO4)2 that can be formed is
  • 0.7
  • 0.5
  • 0.30
  • 0.10
Which one of the following properties of an element is not variable?
  • Valency
  • Atomic weight
  • Equivalent weight
  • All of the above
If 1021 molecules are removed from 200 mg of CO2, then the number of moles of CO2 left are

  • Chemistry-Some Basic Concepts of Chemistry-7253.png
  • 2)
    Chemistry-Some Basic Concepts of Chemistry-7254.png

  • Chemistry-Some Basic Concepts of Chemistry-7255.png

  • Chemistry-Some Basic Concepts of Chemistry-7256.png
Vapour density of a metal chloride is 66. Its oxide contains 53% metal. The atomic weight of the metal is
  • 21
  • 54
  • 27.06
  • 2.086
One gram of hydrogen is found to combine with 80 g of bromine. One gram of calcium (valency =combines with 4 g of bromine. The equivalent weight of calcium is
  • 10
  • 20
  • 40
  • 80
What is the normality of 1 M solution of H3PO4?
  • 0.5 N
  • 1 N
  • 2 N
  • 3 N
Number of molecules in 100 ml of each of O2, NH3and CO2at STP are
  • in the order CO2 < O2 < NH3
  • in the order NH3 < O2 < CO2
  • the same
  • NH3 = CO2 < O2
Two samples of lead oxide were separately reduced to metallic lead by heating in a current of hydrogen. The weight of lead from one oxide was half the weight of lead obtained from the other oxide. The data illustrates
  • law of reciprocal proportions
  • law of constant proportions
  • law of multiple proportions
  • law of equivalent proportions
1.520 g of the hydroxide of a metal on ignition gave 0.995 g of oxide. The equivalent weight of metal is
  • 1.520
  • 0.995
  • 19.00
  • 9.00
In known elements, the maximum number is of
  • metals
  • non – metals
  • metalloids
  • none of the above
Which of the following weighs the least?
  • 2 g atom of N (at. wt. of N = 14)
  • 3×1023 atoms of C (at. wt. of C = 12)
  • 1 mole of S (at. wt. of S = 32)
  • 7 g silver (at. wt. of Ag = 108)
Crystals of which pair are isomorphous ?
  • ZnSO4, SnSO4
  • MgSO4, CaSO4
  • ZnSO4, MgSO4
  • PbSO4, NiSO4
3.92 g/l of a sample of ferrous ammonium sulphate reacts completely with 50 ml. N/10 KMnO4 solution. The percentage purity of the sample is:
  • 50
  • 78.4
  • 80.0
  • 39.2
The equivalent weight of an element is 4. Its chloride has a V.D. 59.25. Then the valency of the element is
  • 4
  • 3
  • 2
  • 1
1 c.c. of N2O at NTP contains :

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  • 2)
    Chemistry-Some Basic Concepts of Chemistry-7271.png

  • Chemistry-Some Basic Concepts of Chemistry-7272.png
  • all the above
A metal oxide has the formula Z2O3. It can be reduced by hydrogen to give free metal and water. 0.1596 g of the metal oxide requires 6 mg of hydrogen for complete reduction. The atomic weight of the metal is
  • 27.9
  • 159.6
  • 79.8
  • 55.8
Ratio of Cp and Cv of a gas ‘X’ is 1.4. The number of atoms of the gas ‘X’ present in 11.2 litres of it at NTP will be :

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  • 2)
    Chemistry-Some Basic Concepts of Chemistry-7276.png

  • Chemistry-Some Basic Concepts of Chemistry-7277.png

  • Chemistry-Some Basic Concepts of Chemistry-7278.png

Chemistry-Some Basic Concepts of Chemistry-7281.png
  • 10 gm molecules
  • 5 gm molecules
  • 1 gm molecules
  • 0.5 gm molecules
Boron has two stable isotopes, 10B(19%) and 11B(81%). The atomic mass that should appear for boron in the periodic table is
  • 10.8
  • 10.2
  • 11.2
  • 10.0
The molecular weight of O2 and SO2 are 32 and 64 respectively. At 15o 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-7284.png
  • 41.59 g
  • 415.9 g
  • 4.159 g
  • none of the three
The sulphate of a metal M contains 9.87% of M. This sulphate is isomorphous with ZnSO4. 7H2O. The atomic weight of M is
  • 40.3
  • 36.3
  • 24.3
  • 11.3
A 5 molar solution of H2SO4is diluted from 1 litre to a volume of 10 litres, the normality of the solution will be :
  • 1N
  • 0.1N
  • 5N
  • 0.5N
1.25g of a solid disbasic acid is completely neutralised by 25 mL of 0.25 molar Ba(OH)2 solution. Molecular mass of the acid is
  • 100
  • 150
  • 120
  • 200
The law of multiple proportions was proposed by
  • Lavoisier
  • Dalton
  • Proust
  • Gay- Lussac
0.115 g of pure sodium metal was dissolved in 500 mL distilled water. The normality of the solution would be [ Na = 23 ]
  • 0.010 N
  • 0.00115 N
  • 0.023 N
  • 0.046 N
How many millilitres (mL) of 1 M H2SO4 solution is required to neutralise 10 mL of 1 M NaOH solution ?
  • 2.5 mL
  • 5.0 mL
  • 10.0 mL
  • 20.0 mL
Rearrange the following (I to IV ) in the order of increasing masses and choose the correct answer from (a), (b) ,(c) and (d) ( Atomic mass :N =14, O=16, Cu =63).
I. 1 molecule of oxygen
II. 1 atom of nitrogen
III. 1 × 10-10 g molecular weight of oxygen
IV. 1 × 10-10 g atomic weight of copper
  • II < I < III < IV
  • IV < III < II < I
  • II < III < I < IV
  • III < IV < I < II
If NA is Avogadro’s number then number of valence electrons in 4.2 g of nitride ions (N3-) is
  • 2.4 NA
  • 4.2 NA
  • 1.6 NA
  • 3.2 NA

Chemistry-Some Basic Concepts of Chemistry-7292.png
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  • 2
  • 3
  • 4
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