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JEE Questions for Chemistry Some Basic Concepts Of Chemistry Quiz 6 - MCQExams.com
JEE
Chemistry
Some Basic Concepts Of Chemistry
Quiz 6
A balanced chemical equation is in accordance with
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Avogadro’s law
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Law of constant proportions
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Law of conservation of mass
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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 ?
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b
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a
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2b
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(a/b)
Calculate the molarity of a solution obtained by mixing 50mL of 0.5M H
2
SO
4
and 75 mL of 0.25M H
2
SO
4
.
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0.375M
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0.35M
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0.045M
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0.45M
Which of the following has the highest normality ?
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1M H2SO4
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1M H3PO3
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1M H3PO4
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1M HNO3
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i - q, ii - p, iii - r, iv - s
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i - s, ii - q, iii - p, iv - r
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i - q, ii - s, iii - p, iv - r
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i - r, ii - s, iii - p, iv - q
The total number of atoms of all elements present in mole of ammonium dichromate is
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19
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6.023 × 1023
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114.47 × 1023
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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
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58
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32
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11.2
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24
100 mL of PH
3
on heating forms P and H
2
. The volume change in the reaction is
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an increase of 50 mL
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an increase of 100 mL
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an increase of 150 ml
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a decrease of 50 mL
Volume occupied by one molecule of water (d = 1 gm cm
-3
) is
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9 x 10-23cm3
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6.02 x 10-23cm3
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3 x 10-23cm3
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5.5 x 10-23cm3
An ore contains 1.24% of the mineral Argentine Ag
2
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 ?
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23.15 g
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69.45 g
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92.6 g
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46.3 g
Find the electric charge in coulomb of 9.0 gm of Al
3+
ions.
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9.6 × 104
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6.9 × 104
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2.9 × 105
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4.80 × 10-19
Two containers P and Q of equal volumes contain 6 g of O
2
and SO
2
respectively at 300 K and 1 atmosphere. Then
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No. of molecules in P is less than that in Q
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No. of molecules in Q is less than that in P
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No. of molecules in P and Q are same.
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cannot be determined
Which of the following pairs of substances illustrates the law of multiple proportions ?
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CO and CO2
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NaCl and NaBr
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H2O and D2O
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MgO and Mg(OH)2
A : Normality of 0.1M H
2
SO
4
is 0.2 N. R : H
2
SO
4
is a dibasic acid.
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If both A and R are correct and R is the correct explanation of A.
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If both A and R are correct and R is not the correct explanation of A.
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If A is correct R is wrong.
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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.
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If both A and R are correct and R is the correct explanation of A.
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If both A and R are correct and R is not the correct explanation of A.
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If A is correct R is wrong.
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If both A and R are false.
A : In the equation NH
3
+ HCl → NH
4
Cl, Gay-Lussac’s law is not applicable to NH
4
Cl. R : NH
4
Cl is not a gas,.
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If both A and R are correct and R is the correct explanation of A.
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If both A and R are correct and R is not the correct explanation of A.
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If A is correct R is wrong.
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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
12
C.
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If both A and R are correct and R is the correct explanation of A.
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If both A and R are correct and R is not the correct explanation of A.
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If A is correct R is wrong.
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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.
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If both A and R are correct and R is the correct explanation of A.
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If both A and R are correct and R is not the correct explanation of A.
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If A is correct R is wrong.
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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
12
C.
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If both A and R are correct and R is the correct explanation of A.
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If both A and R are correct and R is not the correct explanation of A.
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If A is correct R is wrong.
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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.
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If both A and R are correct and R is the correct explanation of A.
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If both A and R are correct and R is not the correct explanation of A.
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If A is correct R is wrong.
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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.
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If both A and R are correct and R is the correct explanation of A.
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If both A and R are correct and R is not the correct explanation of A.
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If A is correct R is wrong.
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If both A and R are false.
A : 1 L of O
2
and 1 L of O
3
contains the same number of moles under identical conditions. R : Under identical conditions, 1 L of O
2
and 1 L of O
3
contain the same number of oxygen atoms.
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If both A and R are correct and R is the correct explanation of A.
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If both A and R are correct and R is not the correct explanation of A.
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If A is correct R is wrong.
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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’.
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If both A and R are correct and R is the correct explanation of A.
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If both A and R are correct and R is not the correct explanation of A.
0%
If A is correct R is wrong.
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If both A and R are false.
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1
0%
2
0%
3
0%
4
The percentage weight of Zn in white vitriol [ZnSO
4
.7H
2
O] is approximately equal to (Zn 65,S 32,O 16 and H = 1)
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33.65 %
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32.56 %
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23.65 %
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22.65 %
Which one of the following set of units represents the smallest and largest amount of energy respectively ?
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J and erg
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erg and cal
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cal and eV
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L-atm and J
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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 ?
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75
0%
96
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60
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84
If Avogadro number N
A
, is changed from 6.022 ×10
23
mol
–1
to 6.022 × 10
20
mol
–1
this would change :
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the definition of mass in units of grams
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the mass of one mole of carbon
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the ratio of chemical species to each other in a balanced equation.
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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
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6.02 x 1025
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6.02 x 1024
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6.02 x 18 x 1023
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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
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II < I < III < IV
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I < II < III < IV
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III < II < IV < I
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IV < II < III < I
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II < IV < I < III
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