JEE Questions for Chemistry Some Basic Concepts Of Chemistry Quiz 4 - MCQExams.com

Two containers P and Q of equal volume (1litre each) contain 6g of O2 and SO2 respectively at 300 K Then
  • Number of molecules in P is less than that in Q
  • Number of molecules in Q is less than that in P
  • Number of molecules in P and Q are same
  • Either (or (2)
The number of moles of oxygen in one litre of air containing 21% oxygen by volume, in standard conditions, is :
  • 0.186 mole
  • 0.21 mole
  • 2.10 mole
  • 0.0093 mole
Dimensions of pressure are same as that of
  • Energy
  • Force
  • Energy per unit volume
  • Force per unit volume
The amount of zinc required to produce 224 ml of H2 at STP on treatment with dil.H2SO4 will be
  • 0.65 g
  • 6.5 g
  • 65 g
  • 0.065g
Given the numbers: 161cm, 0.161 cm, 0.0161cm. The number of significant figures for the three numbers are
  • 3, 4 and 5 respectively
  • 3, 3 and 3 respectively
  • 3, 3 and 4 respectively
  • 3, 4 and 4 respectively
A molal solution is one that contains 1 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
One mole of calcium phosphide on reaction with excess of water gives
  • one mole of phosphine
  • two moles of phosphoric acid
  • two moles of phosphine
  • one mole of phosphorus pentoxide
Assuming fully decomposed, the volume of CO2 released at STP on heating 9.85 g of BaCO3 (Atomic mass , Ba =will be
  • 0.84 L
  • 2.24 L
  • 4.06 L
  • 1.12 L
A compound contains atoms of three elements in A, B and C. If the oxidation number of A is +2, B is +5 and that of C is -2, the possible formula of the compound is
  • A3(BC4)2
  • A3(B4C)2
  • ABC2
  • A2(BC3)2
An aqueous solution of 6.3 g of oxalic acid dihydrate is made up to 250 ml. The volume of 0.1 N NaOH required to completely neutralise 10 ml of this solution is
  • 40 ml
  • 20 ml
  • 10 ml
  • 4 ml

Chemistry-Some Basic Concepts of Chemistry-7301.png
  • 1, 1, 2, 2, 1
  • 2, 2, 1, 1, 1
  • 2, 1, 1, 2, 1
  • 2, 2, 1, 2, 1
Among the following pairs of compounds, the one that illustrates the law of multiple proportions is
  • NH3 and NCl3
  • H2S and SO2
  • CuO and Cu2O
  • CS2 and FeSO4
Irrespective of the source, pure sample of water always yields 88.89% mass of oxygen and 11.11% mass of hydrogen. This is explained by the law of
  • conservation of mass
  • constant composition
  • multiple proportions
  • constant volume
If 224 ml of a triatomic gas has a mass of 1 g at 273 K and 1 atm pressure, then the mass of one atom is

  • Chemistry-Some Basic Concepts of Chemistry-7303.png
  • 2)
    Chemistry-Some Basic Concepts of Chemistry-7304.png

  • Chemistry-Some Basic Concepts of Chemistry-7305.png

  • Chemistry-Some Basic Concepts of Chemistry-7306.png
If isotopic distribution of C -12 and C -14 is 98% and 2% respectively, then the number of C-14 atoms in 12 g of carbon is

  • Chemistry-Some Basic Concepts of Chemistry-7308.png
  • 2)
    Chemistry-Some Basic Concepts of Chemistry-7309.png

  • Chemistry-Some Basic Concepts of Chemistry-7310.png

  • Chemistry-Some Basic Concepts of Chemistry-7311.png
4.0 g of caustic soda (mol.masscontains same number of sodium ions as are present in :
  • 10.6 g of Na2CO3 (mol. mass 106)
  • 58.5g of NaCl (formula mass 58.5)
  • 100 ml of 0.5 M Na2SO4 (formula mass 142)
  • 1 gm equivalent of Na NO3 (mol. mass 85 )
Number of atoms in 558.5 g Fe (at wt. of Fe = 55.85 g mol-1) is
  • twice that in 60 g carbon
  • 2)
    Chemistry-Some Basic Concepts of Chemistry-7314.png
  • half that in 8 g He

  • Chemistry-Some Basic Concepts of Chemistry-7315.png
2.6 g of a mixture of calcium carbonate and magnesium carbonate is strongly heated to constant weight of 1.3 g. The atomic weights of calcium and magnesium are 40 and 24 respectively. State which of the following weights expresses the weight of calcium carbonate in the original mixture?
  • 980 mg
  • 400 mg
  • 1.75 g
  • 0.74 g
If potassium chlorate is 80% pure, then 48 g of oxygen would be produced from (atomic mass of K = 39):
  • 153.12 g of KClO3
  • 122.5 g of KClO3
  • 245 g of KClO3
  • 98.0 g of KCIO3
Which one of the following has maximum number of atoms of oxygen
  • 2 g of carbon monoxide
  • 2 g of carbon dioxide
  • 2 g of sulphur dioxide
  • 2 g of water
3.92 g of ferrous ammonium sulphate crystals are dissolved in 100 ml of water. 20 ml of this solution requires 18 ml of potassium permanganate during titration for complete oxidation. The weight of KMnO4 present in one litre of the solution of
  • 34.76 g
  • 12.38 g
  • 1.238 g
  • 3.476 g
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.from the reduction of boron tri chloride by hydrogen ?
  • 67.2 L
  • 44.8L
  • 22.4 L
  • 89.6 L

Chemistry-Some Basic Concepts of Chemistry-7322.png
  • 31.6
  • 52.7
  • 7.0
  • 158.0
The simplest formula of a compound containing 50% of element X (atomic massand 50% of element Y (atomic massis
  • XY
  • X2Y
  • XY3
  • X2Y3

Chemistry-Some Basic Concepts of Chemistry-7325.png
  • 20 ml of 0.5 M oxalic acid
  • 20 ml of 0.1 M oxalic acid
  • 50 ml of 0.5 M oxalic acid
  • 50 ml of 0.1 M oxalic acid
If an iodized salt contains 1% of KI and a person takes 2g of the salt every day, the iodide ions going into his body everyday would be approx

  • Chemistry-Some Basic Concepts of Chemistry-7327.png
  • 2)
    Chemistry-Some Basic Concepts of Chemistry-7328.png

  • Chemistry-Some Basic Concepts of Chemistry-7329.png

  • Chemistry-Some Basic Concepts of Chemistry-7330.png
If the density of water is 1 g cm-3 then the volume occupied by one molecule of water is approximately
  • 18 cm3
  • 22400 cm3

  • Chemistry-Some Basic Concepts of Chemistry-7332.png

  • Chemistry-Some Basic Concepts of Chemistry-7333.png
Zinc sulphate contains 22.65% of zinc and 43.9% of water of crystallization. If the law of constant proportions is true, then the weight of zinc required to produce 20 g of the crystals will be
  • 45.3 g
  • 4.53 g
  • 0.453 g
  • 453 g
n g of a substance X reacts with m g of substance Y to form p g of substance R and q g of substance S.
This reaction can be represented as follow : X +Y = R + S
The relation which can be established in the amounts of the reactants and the products will be
  • n – m = p – q
  • n + m = p + q
  • n = m
  • p = q
100 ml of 0.1 N hypo decolourised iodine by the addition of x g of crystalline copper sulphate to excess of KI. The value of ‘x’ is :
(molecular wt. of CuSO4. 5H2O is 250).
  • 5.0 g
  • 1.25 g
  • 2.5 g
  • 4 g
0:0:1


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