Question 1 Which of the following terms are unitless?
(a) Molality
(b) Molarity
(c) Mole fraction
(d) Mass percent
Question 2 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
Question 3 Number of significant Figures in the numer 1.065
(a) 3
(b) 4
(c) 2
(d) 1
Question 4 How many moles of atom are contained in 32.7 g of Zn
(a) .200
(b) .500
(c) 1.50
(d) .0118
Question 5 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
Question 6 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
Question 7 The percentage of Carbon is Ca(HCO3)2 is
(a) 15%
(b) 1.8%
(c) 14.8%
(d) 15.2%
Question 8
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
Question 9
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
Question 10 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
Question 11 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
Question 12 the mass of 2.044×1023 carbon atoms.
(a) 12 g
(b) 36 g
(c) 24 g
(d) 48 g
Question 13 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
Question 14 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(s)
(d) CH4(g)+2O2(g)→CO2(g)+2H2O(g)
Question 15 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
Question 16 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
Question 17 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
Question 18 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
Question 19 1 Mole of CH4 contains
(a) 6.02×1023 atoms of H
(b) 4 gm-atoms of hydrogen
(c) 1.81×1023 molecules of CH4
(d) 3g of Carbon
Question 20 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)
