How many moles of lead (II) chloride will be formed from a reaction between 6.5g of PbO and 3.2g of HCl?

(1) 0.044                           

(2) 0.333

(3) 0.011                           

(4) 0.029

Subtopic:  Equation Based Problem |
From NCERT
NEET - 2008
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Concentrated aqueous sulphuric acid is 98% H2SO4 by mass and has a density of 1.80 g mL-1. Volume of acid required to make one litre of 0.1 M H2S04 solution is :

(1) 11.10 mL

(2) 16.65 mL

(3) 22.20 mL

(4) 5.55 mL

Subtopic:  Concentration Based Problem |
 58%
From NCERT
NEET - 2007
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What is the molarity of H2SO4 solution that has a density 1.84 g/cc at 35°C and contains 98% H2SO4 by weight?

1. 4.18 M                                   2. 8.14 M

3. 18.4 M                                   4. 18 M

Subtopic:  Concentration Based Problem |
 71%
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10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded. The amount of water produced in this reaction will be:

1. 2 mol

2. 3 mol

3. 4 mol

4. 1 mol

Subtopic:  Equation Based Problem |
 68%
From NCERT
NEET - 2009
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The number of atoms in 0.1 mole of a triatomic gas is: 
(NA=6.02 x1023mol-1)

1. 6.026 x 1022  2. 1.806x1023
3. 3.600 x 1023 4. 1.800 x 1022

Subtopic:  Moles, Atoms & Electrons |
 70%
From NCERT
NEET - 2010
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25.3 g of Sodium carbonate Na2CO3 is dissolved in enough water to make 250 mL of

solution. If sodium carbonate dissociates completely, molar concentration of sodium ion,

Na+ and carbonate ion CO32- are respectively (Molar mass of Na2CO3 = 106 g mol-1)

1. 0.955 M and 1.910 M

2. 1.910 M and 0.955 M

3. 1.90 M and 1.910 M

4. 0.477 M and 0.477 M

Subtopic:  Concentration Based Problem |
 65%
From NCERT
NEET - 2010
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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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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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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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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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