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 |
 56%
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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 |
 56%
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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 |
 69%
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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%
From NCERT
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The impure 6 g of NaCl is dissolved in water and then treated with excess of silver nitrate solution. The weight of precipitate of silver chloride is found to be 14 g. The % purity of NaCl solution would be:

1.  95%

2.  85%

3.  75%

4.  65%

Subtopic:  Equation Based Problem |
 59%
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25.4 g of I2 and 14.2 g  of Cl2 are made to react completely to yield a mixture of ICI and ICI3. The mole of ICI and ICI3 formed, is respectively -

1. 0.5, 0.2

2. 0.1, 0.1

3. 0.1, 0.3

4. 0.3, 0.4

Subtopic:  Limiting Reagent | Equation Based Problem |
 73%
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