A solution of Na2S2O3 is standardized iodometrically against 0.167 g of KBrO3. This process requires 50 mL of the Na2S2O3 solution. What is the normality of the  Na2S2O3?

1. 0.2 N

2. 0.12 N

3. 0.72 N

4. 0.02 N

Subtopic:  Equivalent Concept |
 53%
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The NH3 evolved due to complete conversion of N from 1.12 g sample of protein was absorbed in 45 mL of 0.4 N HNO3. The excess acid required 20 mL of 0.1 N NaOH. The % N in the sample is:

1.  8

2.  16

3.  20

4.  25

Subtopic:  Equivalent Concept |
 50%
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When a mixture containing HCl and H2SO4 weighing 0.1 g undergoes treatment with an excess of AgNO3 solution, resulting in the formation of 0.1435 g of AgCl, what is the weight percentage of H2SO4 in the mixture?

1.  36.5

2.  63.5

3.  50

4.  None of the above

Subtopic:  Equation Based Problem |
 69%
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What volume of O2g measured at 1 atm and 273 K will be formed by the action of 100 mL of 0.5 N KMnO4 on hydrogen peroxide in an acid solution?

The skeleton equation for the reaction is

KMnO4+H2SO4+H2O2 K2SO4+MnSO4+O2+H2O

1.  0.12 litre

2.  0.028 litre

3.  0.56 litre

4.  1.12 litre

Subtopic:  Equivalent Concept |
 52%
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Equivalent weight of H3PO2 when it disproportionate into PH3 and H3PO3 is:

1. M

2. M/2

3. M/4

4. 3M/4

Subtopic:  Equivalent Weight |
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The molar mass of diacidic organic Lewis base (B), if 12 g of chloroplatinate salt BH2PtCl6 on ignition produced 5 gm residue of Pt,will be -

1.  52

2.  58

3.  88

4.  None of these

Subtopic:  Moles, Atoms & Electrons |
 64%
From NCERT
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What volume of HCl solution of density 1.2 g/cm3 and containing 36.5% by weight HCl, must be allowed to react with zinc(Zn) in order to liberate 4.0 g of hydrogen?

1.  333.33 mL

2.  500 mL

3.  614.66 mL

4.  None of these

Subtopic:  Equation Based Problem |
 64%
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100 mL of H2SO4 solution having molarity of 1M and density 1.5 g/mL is mixed with 400 mL of water. The molarity of the H2SO4 solution will be: (final density is 1.25 g/mL )

1. 4.4 M 2. 0.145 M
3. 0.52 M 4. 0.227 M
Subtopic:  Moles, Atoms & Electrons |
 55%
From NCERT
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Links
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Phosphoric acid H3PO4 prepared in a two step process.

(1) P4+5O2  P4O10
(2) P4O10+6H2O  4H3PO4

We allow 62g of phosphorus to react with react with excess oxygen which form P4O10 in 85% yield. In the step (2) reaction 90% yield of H3PO4 is obtained. Produced mass of H3PO4 is:

1.  37.485 g

2.  149.949 g

3.  125.47 g

4.  564.48 g

Subtopic:  Equation Based Problem |
 65%
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Sulphur burns according to the reaction

 18S8s+O2g  SO2g
What volume of air, at 1 atm and 273 K, containing 21%  oxygen by volume is required to completely burn sulphur S8 present in 200 g of the sample?
(This sample contains 20% inert material which does not burn)

1.  23.52 litre

2.  320 litre

3.  112 litre

4.  533.33 litre

Subtopic:  Equation Based Problem |
From NCERT
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