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Sample Paper chemistry Class 11
1. 1.7 g of AgNO3 is dissolved in 100 g of water. 0.585g of NaCl dissolved in 100g of water is added to it and chemical reaction occurs. 1.435g of AgCl and 0.85 g of
NaNO3
are formed. Justify that the data obey the law of conservation of mass
2. (a) When 4.2g of sodium bicarbonate is added to a solution of acetic acid weighing 10g, it is observed that 2.2g of CO2 is released into atmosphere.
The residue is found to weigh 12g. Show that these observations are in agreement with the law of conservation of mass.
(b) If 6.3 g of sodium bicarbonates is added to 15g of acetic acid solution, the residue is found to weigh 18g, what is the mass of CO2 released in the reaction? 3. In an experiment, 1.375g of CuO was reduced by heating in a current of hydrogen and the weight of copper that remained was 1.098g. In another experiment,
1.179g of CuO was dissolved in nitric acid and the resulting Copper(I) nitrate converted into CuO by ignition. The weight of CuO that was formed was 1.476g.
Show that these results illustrate the law of constant proportions.
4. Carbon and oxygen are known to form two compounds. The carbon content in one of these is 42.9% while in the other is 27.3%. Show that this data is in agreement with the law of multiple proportions.
5. On analysis, it was found that black oxide of copper and red oxide of copper contained 79.9% and 88.8% of copper respectively. Show that this data is in accordance with the law of multiple proportions.
6. Calculate the mass of 1 molecule of nitrogen
7. Calculate the mass of 1 molecule of water and 100 molecules of C12H 22O11
8. Calculate the mass of an atom of silver (Ag = 108 amu)
9. Calculate the number of atoms in (a) 52 moles of He (b) 52 a.m.u of He (c) 52 g of He
10. Calculate the volume occupied by the following at STP
a. 14 g of nitrogen gas
b. 1.5 gram mole of CO2Che/XI Chapter 1
11. Calculate the number of moles in each of the
1. 1.7 g of AgNO3 is dissolved in 100 g of water. 0.585g of NaCl dissolved in 100g of water is added to it and chemical reaction occurs. 1.435g of AgCl and 0.85 g of
NaNO3
are formed. Justify that the data obey the law of conservation of mass
2. (a) When 4.2g of sodium bicarbonate is added to a solution of acetic acid weighing 10g, it is observed that 2.2g of CO2 is released into atmosphere.
The residue is found to weigh 12g. Show that these observations are in agreement with the law of conservation of mass.
(b) If 6.3 g of sodium bicarbonates is added to 15g of acetic acid solution, the residue is found to weigh 18g, what is the mass of CO2 released in the reaction? 3. In an experiment, 1.375g of CuO was reduced by heating in a current of hydrogen and the weight of copper that remained was 1.098g. In another experiment,
1.179g of CuO was dissolved in nitric acid and the resulting Copper(I) nitrate converted into CuO by ignition. The weight of CuO that was formed was 1.476g.
Show that these results illustrate the law of constant proportions.
4. Carbon and oxygen are known to form two compounds. The carbon content in one of these is 42.9% while in the other is 27.3%. Show that this data is in agreement with the law of multiple proportions.
5. On analysis, it was found that black oxide of copper and red oxide of copper contained 79.9% and 88.8% of copper respectively. Show that this data is in accordance with the law of multiple proportions.
6. Calculate the mass of 1 molecule of nitrogen
7. Calculate the mass of 1 molecule of water and 100 molecules of C12H 22O11
8. Calculate the mass of an atom of silver (Ag = 108 amu)
9. Calculate the number of atoms in (a) 52 moles of He (b) 52 a.m.u of He (c) 52 g of He
10. Calculate the volume occupied by the following at STP
a. 14 g of nitrogen gas
b. 1.5 gram mole of CO2Che/XI Chapter 1
11. Calculate the number of moles in each of the