# Which, of the following, laws of chemical combination is followed by $$N_2O~, NO$$ and $$N_2O_3$$ ?  1. Law of conservation of mass  2. Law of multiple proportions  3. Law of constant proportions  4. Gay Lussac's law of constant volume

Subtopic:  Introduction |
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Calculate the approximate mass of  $$CO_2$$ produced  when 1 gm of butane $$(C_4H_{10})$$ is burned with
an excess of $$O_2$$ to form $$CO_2$$.
 1 1 g 2 2 g 3 3 g 4 4 g
Subtopic:  Equation Based Problem |
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Which one of the following samples of gases contains the most particles?
All gases are at 0 °C and 1 atm pressure when 1 mole of gas has a volume of 22.4 L.

[Relative atomic mass, Ar : H = 1, He = 4, C = 12, O = 16, Cl = 35.5]

1. 33.6 L of chlorine gas
2. 66.0 g of carbon dioxide gas
3. 22.4 L of hydrogen gas
4. 10.0 g of helium gas
Subtopic:  Moles, Atoms & Electrons |
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In the following reaction:
$$4HCl + MnO_2 \rightarrow 2H_2O + MnCl_2 + Cl_2$$

Amount(in g) of manganese dioxide that reacts with 7.3 g of HCl is:
(Atomic weight of Mn is 55)

1. 0.23
2. 5.85
3. 4.35
4. 5.18
Subtopic:  Equation Based Problem |
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For the reaction, $$2A+B\xrightarrow{~~~~~~~~}3C,8$$ moles of $$A$$ reacts with $$5$$ moles of $$B$$ to form $$C.$$
Calculate the maximum number of moles that are formed.

1. $$13$$ mole
2. $$15$$ mole
3. $$12$$ mole
4. $$8$$ mole
Subtopic:  Limiting Reagent |
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How many chlorine atoms are in 1.00 mL of CCl4 (M=153.8, density=1.59 g mL-1)?

1. 1.56×1021
2. 6.23×1021
3. 1.57×1022
4. 2.49×1022
Subtopic:  Moles, Atoms & Electrons |
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Consider the two statements:
 Statement I: Scientific notation for 0.00016 is $$1.6 \times 10^{-3}$$. Statement II: The volume of water to be added to change the molarity of 200 mL 0.5 M aqueous solution to 0.1 M is 800 mL

 1 Statement I is correct, Statement II is correct. 2 Statement I is incorrect, Statement II is correct. 3 Statement I is correct, Statement II is incorrect. 4 Statement I is incorrect, Statement II is incorrect.
Subtopic:  Introduction |
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An aqueous solution of urea containing 18 g of urea in 1500 cm3 of the solution has a density of 1.052 g/cm3. If the molecular weight of urea is 60, then the molality of the solution is-
1. 0.2
2. 0.192
3. 0.064
4. 1.2

Subtopic:  Concentration Based Problem |
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The NaNO3 weighed out to make 50 mL of an aqueous solution containing 70.0 mg Na+ per ml is:

(Rounded off to the nearest integer) [Given: Atomic weight in g mol–1 – Na: 23; N: 14; O: 16]

1. 13 g

2. 26 g

3. 18 g

4. 22 g

Subtopic:  Concentration Based Problem |
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A solution is prepared by adding 2 g of substance A to 18 g of water. The mass percent of the solute is-

1. 20%

2. 10%

3. 15%

4. 18%

Subtopic:  Concentration Based Problem |
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