JEE Questions for Chemistry Some Basic Concepts Of Chemistry Quiz 6 - MCQExams.com

A balanced chemical equation is in accordance with
  • Avogadro’s law
  • Law of constant proportions
  • Law of conservation of mass
  • Law of gaseous volumes
The atomic weights of two elements X and Y are 20 and 40 respectively. If ‘a’ gm of X contains ‘b’ atoms, how many atoms are present in ‘2a’ gm of Y ?
  • b
  • a
  • 2b
  • (a/b)
Calculate the molarity of a solution obtained by mixing 50mL of 0.5M H2SO4 and 75 mL of 0.25M H2SO4.
  • 0.375M
  • 0.35M
  • 0.045M
  • 0.45M
Which of the following has the highest normality ?
  • 1M H2SO4
  • 1M H3PO3
  • 1M H3PO4
  • 1M HNO3

Chemistry-Some Basic Concepts of Chemistry-7383.png
  • i - q, ii - p, iii - r, iv - s
  • i - s, ii - q, iii - p, iv - r
  • i - q, ii - s, iii - p, iv - r
  • i - r, ii - s, iii - p, iv - q
The total number of atoms of all elements present in mole of ammonium dichromate is
  • 19
  • 6.023 × 1023
  • 114.47 × 1023
  • 84 × 1023
0.32 gm of a metal on treatment with an acid gave 112 mL of hydrogen at STP. Calculate the equivalent weight of the metal
  • 58
  • 32
  • 11.2
  • 24
100 mL of PH3 on heating forms P and H2 . The volume change in the reaction is
  • an increase of 50 mL
  • an increase of 100 mL
  • an increase of 150 ml
  • a decrease of 50 mL
Volume occupied by one molecule of water (d = 1 gm cm-3) is
  • 9 x 10-23cm3
  • 6.02 x 10-23cm3
  • 3 x 10-23cm3
  • 5.5 x 10-23cm3
An ore contains 1.24% of the mineral Argentine Ag2 S by mass. How many grams of this ore would have to be processed in order to obtain 1.0 g of pure solid silver ?
  • 23.15 g
  • 69.45 g
  • 92.6 g
  • 46.3 g
Find the electric charge in coulomb of 9.0 gm of Al3+ ions.
  • 9.6 × 104
  • 6.9 × 104
  • 2.9 × 105
  • 4.80 × 10-19
Two containers P and Q of equal volumes contain 6 g of O2 and SO2 respectively at 300 K and 1 atmosphere. Then
  • No. of molecules in P is less than that in Q
  • No. of molecules in Q is less than that in P
  • No. of molecules in P and Q are same.
  • cannot be determined
Which of the following pairs of substances illustrates the law of multiple proportions ?
  • CO and CO2
  • NaCl and NaBr
  • H2O and D2O
  • MgO and Mg(OH)2
A : Normality of 0.1M H2SO4 is 0.2 N.
R : H2SO4 is a dibasic acid.
  • If both A and R are correct and R is the correct explanation of A.
  • If both A and R are correct and R is not the correct explanation of A.
  • If A is correct R is wrong.
  • If both A and R are false.
A : 1 Gram molecule of sulphur also represents 1 gram atom of sulphur.
R : Atomic city of sulphur is one.
  • If both A and R are correct and R is the correct explanation of A.
  • If both A and R are correct and R is not the correct explanation of A.
  • If A is correct R is wrong.
  • If both A and R are false.
A : In the equation NH3 + HCl → NH4Cl, Gay-Lussac’s law is not applicable to NH4Cl.
R : NH4Cl is not a gas,.
  • If both A and R are correct and R is the correct explanation of A.
  • If both A and R are correct and R is not the correct explanation of A.
  • If A is correct R is wrong.
  • If both A and R are false.
A : Atomic mass of sodium is 23 u.
R : An atom of sodium is 23 times heavier than an atom of 12C.
  • If both A and R are correct and R is the correct explanation of A.
  • If both A and R are correct and R is not the correct explanation of A.
  • If A is correct R is wrong.
  • If both A and R are false.
A : Pure water, irrespective of its source always contain hydrogen and oxygen in the ratio 1 : 8 by mass.
R : Total mass of reactants and products remains constant during physical or chemical change.
  • If both A and R are correct and R is the correct explanation of A.
  • If both A and R are correct and R is not the correct explanation of A.
  • If A is correct R is wrong.
  • If both A and R are false.
A : Mass numbers of most of the elements are fractional.
R: Mass numbers are obtained by comparing with mass number of 12C.
  • If both A and R are correct and R is the correct explanation of A.
  • If both A and R are correct and R is not the correct explanation of A.
  • If A is correct R is wrong.
  • If both A and R are false.
A : The mass of the products formed in a reaction depends upon the limiting reactant.
R: Limiting reactant reacts completely in the reaction.
  • If both A and R are correct and R is the correct explanation of A.
  • If both A and R are correct and R is not the correct explanation of A.
  • If A is correct R is wrong.
  • If both A and R are false.
A : Cinnabar is a chemical compound whereas brass is mixture.
R : Cinnabar always contain 6.25 times mercury than sulphur by weight. Brass can have any proportion of Cu and Zn.
  • If both A and R are correct and R is the correct explanation of A.
  • If both A and R are correct and R is not the correct explanation of A.
  • If A is correct R is wrong.
  • If both A and R are false.
A : 1 L of O2 and 1 L of O3 contains the same number of moles under identical conditions.
R : Under identical conditions, 1 L of O2 and 1 L of O3 contain the same number of oxygen atoms.
  • If both A and R are correct and R is the correct explanation of A.
  • If both A and R are correct and R is not the correct explanation of A.
  • If A is correct R is wrong.
  • If both A and R are false.
A : The standard unit for expressing atomic mass is amu.
R : Now a days amu is represented by ‘u’.
  • If both A and R are correct and R is the correct explanation of A.
  • If both A and R are correct and R is not the correct explanation of A.
  • If A is correct R is wrong.
  • If both A and R are false.

Chemistry-Some Basic Concepts of Chemistry-7389.png
  • 1
  • 2
  • 3
  • 4
The percentage weight of Zn in white vitriol [ZnSO4.7H2O] is approximately equal to (Zn 65,S 32,O 16 and H = 1)
  • 33.65 %
  • 32.56 %
  • 23.65 %
  • 22.65 %
Which one of the following set of units represents the smallest and largest amount of energy respectively ?
  • J and erg
  • erg and cal
  • cal and eV
  • L-atm and J
  • eV and L-atm
20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample ?
  • 75
  • 96
  • 60
  • 84
If Avogadro number NA, is changed from 6.022 ×1023 mol–1 to 6.022 × 1020 mol–1 this would change :
  • the definition of mass in units of grams
  • the mass of one mole of carbon
  • the ratio of chemical species to each other in a balanced equation.
  • the ratio of elements to each other in a compound
The total number of electrons in 18 mL of water (density = 1 g mL-1) is
  • 6.02 x 1025
  • 6.02 x 1024
  • 6.02 x 18 x 1023
  • 6.02 x 1023
Arrange the following in the order of increasing mass. (Atomic mass of O = 16, Cu = 63, N = 14)
I. One atom of oxygen.
II. One atom of nitrogen.
III. 1 x 10-10 mole of oxygen.
IV. 1 x 10-10 mole of copper
  • II < I < III < IV
  • I < II < III < IV
  • III < II < IV < I
  • IV < II < III < I
  • II < IV < I < III
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