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Free download in PDF Mole Concept Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams IIT-JEE, AIIMS, NEET etc. These short solved questions or quizzes are provided by Gkseries.
(21)
What is a mole?
[A]
A mole is found in a certain number of cm3 of one substance or another
[B]
A mole is the sum of atomic weights
[C]
A mole is the number of molecules in one gram of a substance
[D]
None of the mentioned
Answer: None of the mentioned
(22)
A mixture of gases contains H2 and O2 gases in the ratio of 1:4 (w/w). What is the molar ratio of the two gases in the mixture?
[A]
1:4
[B]
4:1
[C]
16:1
[D]
2:1
(23)
What is the mass of precipitate formed when 50 mL of 16.9% solution of AgNO3 is mixed with 50 mL of 5.8% NaCl solution?
(Ag = 107.8, N = 14, O = 16, Na= 23,Cl=35.5)
[A]
28 g
[B]
3.5 g
[C]
7 g
[D]
14 g
(24)
What is the mole fraction of the solute in a 1.00 m aqueous solution?
[A]
0.177
[B]
1.770
[C]
0.0354
[D]
0.0177
(25)
6.02 x 1020 molecules of urea are present in 100 mL of its solution. The concentration of the solution is
[A]
0.02 M
[B]
0.01 M
[C]
0.001 M
[D]
0.1 M
(26)
The number of atoms in 0.1 mole of a triatomic gas is (NA=6.02 x1023mol-1)
[A]
6.026 x 1022
[B]
1.806x1023
[C]
3.600 x 1023
[D]
1.800 x 1022
(27)
How many moles of lead (II) chloride will be formed from a reaction between 6.5g of PbO and 3.2g of HCl?
[A]
0.044
[B]
0.333
[C]
0.011
[D]
0.029
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