A mixture of NH4NO3 and (NH4)2HPO4 contain 30.40% mass per cent of nitrogen. What is the mass ratio of the two components in the mixture?

1. 2 : 1

2. 1 : 2

3. 3 : 4

4. 4 : 1

Subtopic:  Equation Based Problem |
 51%
From NCERT
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A mixture of O2 and gas "Y" (mol. wt. 80) in the mole ratio a : b has a mean molecular weight 40. What would be mean molecular weight, if the gases are mixed in the ratio b : a under identical conditions? (gases are non-reacting):

1.  40

2.  48

3.  62

4.  72

Subtopic:  Moles, Atoms & Electrons | Equation Based Problem |
From NCERT
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 If 2.74 g of the metal oxide contains 1.53 g of metal, then the empirical formula of vanadium oxide is:

(Atomic Mass of V = 52)

1. V2O3

2. VO

3. V2O5

4. V2O7

Subtopic:  Empirical & Molecular Formula |
 59%
From NCERT
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A gaseous mixture of propane and butane of volume 3 litre on complete combustion produces 11.0 litre CO2 under standard conditions of temperature and pressure. The ratio of volume of butane to propane is:

1. 1 : 2

2. 2 : 1

3. 3 : 2

4. 3 : 1

Subtopic:  Equation Based Problem |
 64%
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The percentage by volume of C3H8 in a gaseous mixture of C3H8CH4 and CO is 20. When 100 mL of the mixture is burnt in excess of O2, the volume of CO2 produced is

1. 90 mL

2. 160 mL

3. 140 mL

4. None of these

Subtopic:  Equation Based Problem |
 56%
From NCERT
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The percentage of oxygen present in the compound CaCO3.3Ca3 PO42 is-

1.  23.3%

2.  45.36%

3.  41.94%

4.  17.08%

Subtopic:  Moles, Atoms & Electrons |
 53%
From NCERT
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0.607 g of a silver salt of tribasic organic acid was quantitatively reduced to 0.37 g of pure Ag.What is the mol. wt. of the acid?

1. 207 g
2. 210 g

3. 531 g 
4. 324g

Subtopic:  Moles, Atoms & Electrons |
 56%
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A gaseous compound is composed of 85.7% by mass carbon and 14.3% by mass hydrogen. It's density is 2.28 g/litre at 300 K and 1.0 atm pressure. Determine the molecular formula of the compound:

1.  C2H2

2.  C2H4

3.  C4H8

4.  C4H10

Subtopic:  Empirical & Molecular Formula |
 57%
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Calculate the % of free SO3 in oleum (a solution of SO3 in H2SO4) that is labelled 109% H2SO4.

1. 40

2. 30

3. 50

4. None

 

Subtopic:  Concentration Based Problem |
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100 mL of 10% NaOH (w/V) is added to 100 mL of 10% HCl (w/V). The resultant solution becomes:

1. alkaline

2. strongly alkaline

3. acidic

4. neutral

Subtopic:  Equivalent Concept |
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