Basic Concepts of Chemistry- 02

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Q1. Calculate the number of Moles of Mg(C2H3O2)2 present in 200 g *

1 point

1.1 moles

0.7 moles

1.4 moles

1.8 moles

Q2. The percentage of Carbon is Ca(HCO3)2 is *

1 point

1.8%

14.8%

0.148%

1.48%

Q3. Which of the following statements about a compound is incorrect? *

1 point

The ratio of atoms of different elements in a compound is fixed

A compound retains the physical properties of its constituent elements.

A compound cannot be separated into its constituent elements by physical methods of separation.

A molecule of a compound has atoms of same or different elements.

Q4. Calculate the number of oxygen atoms in 50 g of CaCO3 *

1 point

6.022 x 10^20

9.033 x 10^23

3.011 x 10^22

6.022 x 10^23

Q5. What will be the molarity of a solution, which contains 5.85 g of NaCl(s) per 500 mL? *

1 point

0.2 mol/L

2 mol/L

4 mol/L

20 mol/L

Q6. The mass of 2.007×10^23 carbon atoms. *

1 point

2 gms

3 gms

4 gms

1 gms

Q7. How many gram of solute is required to prepare 1.0 L of 1 M CaCl2.6H2O? *

1 point

200 g

None of the above

216 g

219 g

Q8. Number of significant Figures in the numer 0.065 *

1 point

Q9. Which of the following reactions is not correct according to the law of conservation of mass *

1 point

C3H8 + O2 = CO2 + H2O

CH4 + 2O2 = CO2 + 2H2O

P4 + 5O2 = P4O10

2Mg + O2 = 2MgO

Q10. What will be the molality of the solution containing 18.25 g of HCl gas in 100 g of water? *

1 point

0.5 m

1 M

1 m

5 m

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