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 |
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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 |
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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 |
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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:  Millimole/Equivalent Concept |
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1.44 gram of titanium (At. wt. =48) reacted with excess of O2 and produce x gram of non-stoichiometric compound Ti1.44 O. The value of x is:

1.  2

2.  1.77

3.  1.44

4.  None of the above

Subtopic:  Equation Based Problem |
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2.0 g sample contain mixture of SiO2 and Fe2O3, on very strong heating leave a residue weighing 1.96 g. The reaction responsible for loss of weight is Fe2O3 s  Fe3O4 s + O2 g (unbalance equation)

What is the percentage by mass of SiO2 in original sample?

1.  10%

2.  20%

3.  40%

4.  60%

Subtopic:  Equation Based Problem |
 55%
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For the reaction; 
\(2Fe{(NO_3)}_3 + 3Na_2CO_3 \rightarrow Fe_2{(CO3)}_3 + 6NaNO_3\)
Initially if 2.5 mole of \(Fe{(NO_3)}_3 \) and 3.6 mole of \(Na_2CO_3\) is taken. If 6.3 mole of \(NaNO_3\) is obtained then % yield of given reaction is:

1.  50

2.  84

3.  87.5

4.  100

Subtopic:  Equation Based Problem |
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0.8 mole of a mixture of CO and CO2 requires exactly 40 gram of NaOH in a solution for complete conversion of all the CO2 into Na2CO3. How many moles more of NaOH would it require for conversion into Na2CO3, if mixture (0.8 mole) is completely oxidised to CO2?

1.  0.2

2.  0.6

3.  1

4.  1.5

Subtopic:  Moles, Atoms & Electrons |
 62%
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