An organic compound containing C, H and N gave the following on analysis: C = 40%, H = 13.3% and N = 46.67%. Its empirical formula would be

 

(1) CHN

(2) C2H2N

(3) CH4N

(4) C2H7N

Subtopic:  Empirical & Molecular Formula |
 81%
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An organic substance containing C, H, and O gave the following percentage composition :

C = 40.687%, H = 5.085% and O = 54.228%. The vapour density of this organic substance is 59.

The molecular formula of the compound will be:

1. C4H6O4

2. C4H6O2

3. C4H4O2

4. None of the above

Subtopic:  Moles, Atoms & Electrons |
 70%
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When a solution containing 4.77 gm. of NaCl is added to a solution of 5.77 gm. of AgNO3, the weight of precipitated AgCl is -

(1) 11.70 gm.

(2) 9.70 gm.

(3) 4.86 gm.

(4) 2.86 gm.

Subtopic:  Moles, Atoms & Electrons |
 61%
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At standard temperature and pressure (STP), the volume of oxygen required to completely combust 30 ml of acetylene under similar conditions is:

1. 100 ml

2. 75 ml

3. 50 ml

4. 25 ml

Subtopic:  Equation Based Problem |
 74%
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What is the volume (in litres) of oxygen at STP required for complete combustion of 32 g of CH4

(1) 44.8

(2) 89.6

(3) 22.4

(4) 179.2

Subtopic:  Equation Based Problem |
 65%
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A mixture of gases contains H2 and O2 gases in the ratio of 1:4 (w/w). What is the molar

ratio of the two gases in the mixture?

1. 1:4             

2. 4:1             

3. 16:1               

4. 2:1

Subtopic:  Moles, Atoms & Electrons |
 58%
From NCERT
NEET - 2015
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If the Avogadro number NA, is changed from 6.022 x 1023 mol-1 to 6.022 x 1020 mol-1 this would change: 

1. The definition of mass in units of grams.

2. The mass of one mole of carbon.

3. The ratio of chemical species to each other in a balanced equation.

4. The ratio of elements to each other in a compound.

Subtopic:  Moles, Atoms & Electrons |
 71%
From NCERT
NEET - 2015
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20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide

and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate

in the sample? (Atomic weight of Mg = 24)

1. 75

2. 96

3. 60

4. 84

Subtopic:  Equation Based Problem |
 52%
NEET - 2015
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When 50 mL of a 16.9 %  (w/v) solution of AgNO3 is mixed with 50 mL of 5.8% (w/v) NaCl solution, then the mass of precipitate formed is:

(Ag = 107.8, N = 14, O = 16, Na= 23,Cl=35.5)

1. 28 g 2. 3.5 g
3. 7 g 4. 14 g
Subtopic:  Equation Based Problem |
 52%
From NCERT
NEET - 2015
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The number of water molecules is maximum in -

1. 18 molecules of water

2. 1.8 g of water

3. 18 g of water

4. 18 moles of water

Subtopic:  Moles, Atoms & Electrons |
 72%
From NCERT
NEET - 2015
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