The molality of a 20% (by mass) CaCO3 solution is : 
(Given: Density of solution is 1.2 gm/ml)

1. 1.25 m 2. 2.5 m
3. 2.08 m 4. 1.5 m

Subtopic:  Concentration Based Problem |
 66%
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1 gm butane (C4H10) is burnt with excess of O2 to form CO2. The approximate mass of CO2 produced is

1. 1gm

2. 2gm

3. 3gm

4. 4gm

Subtopic:  Limiting Reagent |
 59%
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If 0.5 moles of BaCl2 is reacted with 0.2 moles of Na3PO4 then the maximum moles of Ba3(PO4)2 formed is:

1. 0.33 2. 0.25
3. 0.10 4. 0.52
Subtopic:  Limiting Reagent |
 72%
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2 gm Iron pyrite (FeS2) is burnt with O2 to form Fe2O3 and SO2. The mass of SO2 produced is (Fe=56, S=32, O=16)

1. 2 gm

2. 2.13 gm

3. 4 gm

4. 4.26 gm

Subtopic:  Equation Based Problem |
 71%
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Rearrange the following (I to IV) in the order of increasing masses and choose answer from (1), (2), (3) and (4) (Atomic mass : N=14, O=16 Cu = 63)

I. 1 molecule of oxygen

II. 1 atom of nitrogen

III. 1 x 10-10g molecule-weight of oxygen

IV. 1 x 10-10g atom-weight of copper

1. II < I < III < IV

2. IV < III < II < I

3. II < III < I < IV

4. III < IV < I < II

Subtopic:  Moles, Atoms & Electrons |
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What is the ratio of the number of atoms in 2.2 g of CO2 and in 1.7 g of NH3?

1. 1/2 2. 1/8
3. 3/8 4. 3/2
Subtopic:  Moles, Atoms & Electrons |
 56%
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How many moles of FeC2O4 are required to reduce one mole of KMnO4 in acidic medium?

1. 3/5

2. 1/5

3. 5/3

4. 5

Subtopic:  Equation Based Problem |
 53%
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Which of the following pairs of gases contains the same number of molecules:-

(1) 16g of O2 and 14g of N2 

(2) 8g of O2 and 22g of CO2 

(3) 28g of N2 and 22g of CO2 

(4) 32g of O2 and 32g of N2 

Subtopic:  Equation Based Problem |
 83%
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Calculate the number of ions present in 2L of a solution of 1.6 M K4[Fe(CN)6]:

1. 4.8 x 1022 2. 4.8 x 1023
3. 9.6 x 1024 4. 9.6 x 1022

Subtopic:  Moles, Atoms & Electrons |
 64%
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The mass of CO2 that shall be obtained by heating 10 kg of 80 % pure limestone (CaCO3) is:

1. 4.4 kg

2. 6.6 kg

3. 3.52 kg

4. 8.8 kg

Subtopic:  Moles, Atoms & Electrons |
 69%
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