The number of  moles  present in 2.5 litres of 0.2 M  H2SO4 are:

1. 0.25

2. 0.5

3. 0.75

4. 0.2

Subtopic:  Moles, Atoms & Electrons |
 85%
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The number of valence electrons present in 0.53 grams of Na2COis:

1. 3.01×1023

2. 7.22×1022

3. 12.046×1023

4. 6.023×1023

Subtopic:  Moles, Atoms & Electrons |
 60%
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The amount of Zinc (atomic weight=65) necessary to produce 224 mL of H2 (at STP) by the reaction with dilute sulphuric acid will be: 

1. 0.65 g 2. 7.6 g
3. 6.5 g 4. 8.5 g
Subtopic:  Limiting Reagent |
 81%
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On complete decomposition, the volume of CO2 released at STP on heating 9.85 g of BaCO3 (atomic mass, Ba = 137) will be:

1. 1.12 L

2. 4.84 L

3. 2.12 L

4. 2.06 L

Subtopic:  Limiting Reagent |
 80%
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 The maximum number of molecules is present in which of the following? 

1. 15 L of H2 gas at STP

2. 5 L of N2 gas at STP

3. 0.5 g of H2 gas

4. 10 g of O2 gas

Subtopic:  Moles, Atoms & Electrons |
 72%
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If 4 g of NaOH dissolves in 36 g of H2O, the molarity of the solution is: (specific gravity of solution is 1 g mL-1) : 

1. 3 M 2. 3.5 M
3. 2.5 M 4. 2 M
Subtopic:  Concentration Based Problem |
 72%
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On complete combustion, 44 g of a sample of a compound gives 88 g CO2 and 36 g of H2O. The molecular formula of the compound may be:

1.  C4H6 

2.  C2H6O 

3.  C2H4O

4.  C3H6O

Subtopic:  Empirical & Molecular Formula |
 72%
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ln, a closed vessel, 50 ml of A2B3 completely reacts with 200 ml of C2 according to the following equation:

2A2B3(g) + 5C2(g) 3C3B2(g)+CA4(g)

The composition of the gaseous mixture in the system will be:

1. 100 ml C2, 50 ml C3B2,50 ml CA4

2. 25 ml C2, 75 ml  C3B2, 25 ml CA4

3. 75 ml C2, 75 ml C3B2, 25 ml CA4

4. 10 ml C2, 25 ml C3B2, 100 ml CA4

Subtopic:  Limiting Reagent |
 69%
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Two students performed the same experiment separately, and each of them recorded two readings of mass, which are given below. The correct reading of mass is 3.0 g. On the basis of the given data, mark the correct option out of the following statements.

Students Readings
(i) (ii)
    A 3.01 2.99
    B 3.05 2.95

1. The results of both the students' are neither accurate nor precise.
2. The results of student A are both precise and accurate.
3. Student B's results are neither precise nor accurate.
4. The results of student B are both precise and accurate.

Subtopic:  Introduction |
 68%
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If 500 mL of a 5 M solution is diluted to 1500 mL, the molarity of the resultant solution is: 

1. 1.5 M

2. 1.66 M

3. 0.017 M

4. 1.59 M

Subtopic:  Concentration Based Problem |
 82%
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