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Free download in PDF Class 11 Chemistry Chapter 1 Some Basic Concepts of Chemistry Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER and other competitive exams. These short solved questions or quizzes are provided by Gkseries./p>
(1)
Which of the following pairs have the same number of atoms?
[A]
16 g of O2(g) and 4 g of H2(g)
[B]
16 g of O2 and 44 g of CO2
[C]
28 g of N2 and 32 g of O2
[D]
12 g of C(s) and 23 g of Na(s)
(2)
1 Mole of CH4 contains
[A]
6.02×1023 atoms of H
[B]
4 gm-atoms of hydrogen
[C]
1.81×1023 molecules of CH4CH4
[D]
3g of Carbon
Answer: 4 gm-atoms of hydrogen
(3)
A measured temperature on Fahrenheit scale is 200 °F. What will this reading be on Celsius scale?
[A]
40 °C
[B]
94 °C
[C]
93.3 °C
[D]
30 °C
(4)
Which of the following has the largest number of atoms
[A]
0.5 g-atoms of Cu
[B]
0.635 g Cu
[C]
0.25moles of Cu atoms
[D]
1g of Cu
Answer: 0.5 g-atoms of Cu
(5)
The number of Gram molecules of oxygen in 6.02×1024 CO molecules is
[A]
10 gm-molecules
[B]
5 gm-molecules
[C]
1 gm -molecules
[D]
.5 gm-molecules
(6)
How many mL of water must be added to 200 mL of .65 M HCL to dilute the solution to .20 M
[A]
450 mL
[B]
400 mL
[C]
350 mL
[D]
500 mL
(7)
Which of the following reactions is not correct according to the law of conservation of mass.
[A]
2Mg(s)+O2(g)→2MgO(s)
[B]
C3H8(g)+O2(g)→CO2(g)+H2O(g)
[C]
P4(s)+5O2(g)→P4O10
[D]
CH4(g)+2O2(g)→CO2(g)+2H2O(g)
Answer: C3H8(g)+O2(g)→CO2(g)+H2O(g)
(8)
How many gram of solute is required to prepare 1.0 L of 1 M CaCl2.6H2O?
[A]
200 g
[B]
216 g
[C]
219 g
[D]
None of the above
(9)
the mass of 2.044×1023 carbon atoms.
[A]
12 g
[B]
36 g
[C]
24 g
[D]
48 g
(10)
What will be the molarity of a solution, which contains 5.85 g of NaCl(s) per 500 mL?
[A]
4 mol/L
[B]
20 mol/L
[C]
0.2 mol/L
[D]
2 mol/L
(11)
Calculate the number of oxygen atoms in 50 g of CaCO_3.
[A]
6.033×1023 atoms
[B]
9.033×1023 atoms
[C]
8.033×1023 atoms
[D]
3.033×1023 atoms
(12)
Calculate the standard molar volume of oxygen gas. The density of O2 gas at NTP is 1.429g/L.
[A]
22.39litres
[B]
21.2 Litres
[C]
24 Litres
[D]
None of the above
(13)
Which of the following statements about a compound is incorrect?
[A]
A molecule of a compound has atoms of different elements.
[B]
A compound cannot be separated into its constituent elements by physical methods of separation.
[C]
A compound retains the physical properties of its constituent elements.
[D]
The ratio of atoms of different elements in a compound is fixed
Answer: A compound retains the physical properties of its constituent elements.
(14)
The percentage of Carbon is Ca(HCO3)2 is
[A]
15%
[B]
1.8%
[C]
14.8%
[D]
15.2%
(15)
Calculate the number of Moles of Cu(c2H3o2)2 present in 200 g
[A]
1.1 mol
[B]
1 mol
[C]
.9 mol
[D]
1.2 mol
(16)
What will be the molality of the solution containing 18.25 g of HCl gas in 500 g of water?
[A]
0.1 m
[B]
1 M
[C]
0.5 m
[D]
1 m
(17)
How many moles of atom are contained in 32.7 g of Zn
[A]
.200
[B]
.500
[C]
1.50
[D]
.0118
(18)
Number of significant Figures in the numer 1.065
(19)
16 g of oxygen has same number of molecules as in
[A]
16 g of CO
[B]
28 g of N2
[C]
14 g of N2
[D]
1.0 g of H2
(20)
Which of the following terms are unitless?
[A]
Molality
[B]
Molarity
[C]
Mole fraction
[D]
Mass percent
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