An organic compound contains 80 % (by wt.) carbon and the remaining percentage of hydrogen. The right option for the empirical formula of this compound is: [Atomic wt. of C is 12, H is 1] 

1. CH3

2. CH4

3. CH

4. CH2

Subtopic:  Empirical & Molecular Formula |
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The maximum number of atoms is present in which of the following -

1. 1 g of Mg(s)  

2. 1 g of O2 (g)  

3. 1 g of Li(s)    

4. 1 g of Ag(s)   

Subtopic:  Moles, Atoms & Electrons |
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The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber's process is -

1.  40 mol

2.  10 mol

3.  20 mol

4.  30 mol

Subtopic:  Limiting Reagent | Equation Based Problem |
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The density of a 2 M aqueous solution of NaOH is 1.28 g/cm3. The molality of the solution is 

[molecular mass of NaOH = 40 gmol-1]

1. 1.20 m

2. 1.56 m

3. 1.67 m

4. 1.32 m

Subtopic:  Concentration Based Problem |
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The number of water molecules are maximum in which of the following?
1. 18 mL of water 
2. 0.18 g of water 
3. 0.00224 L water vapours at 1 atm and 273 K
4. 10-3 mol of water 
 
Subtopic:  Moles, Atoms & Electrons |
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Which of the following parameters is temperature dependent?

1. Molarity
2. Mole fraction
3. Weight percentage
4. Molality

Subtopic:  Concentration Based Problem |
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Suppose the elements X and Y combine to form two compounds XY2 and X3Y2. If 0.1 moles of XYweighs 10 g and 0.05 mole of X3Y2 weighs 9 g, the atomic weight of X and Y ,respectively, will be
1.  40, 30
2.  60, 40
3.  20, 30
4.  30, 20

Subtopic:  Equation Based Problem |
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If Avogadro number NA, is changed from 6.022×1023 mol-1 to 6.022×1020 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 |
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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. The percentage purity of magnesium carbonate in the sample will be?
(Atomic weight of Mg=24)
1. 75
2. 96
3. 60
4. 84

Subtopic:  Limiting Reagent |
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What is the mass of precipitate formed when 50 mL of 16.9% solution of AgNO3 is mixed with 50 mL of 5.8% NaCl solution? (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 |
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