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 |
 78%
From NCERT
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The same number of molecules as 16 g of dioxygen is present in -

(1) 16 g O3

(2) 16 g SO2

(3) 32 g SO2

(4) All of above

Subtopic:  Moles, Atoms & Electrons |
 75%
From NCERT
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The number of  moles  present in 2.5 litres of 0.2 M  H2SO4 are:

1. 0.25

2. 0.5

3. 0.75

4. 0.2

Subtopic:  Moles, Atoms & Electrons |
 85%
From NCERT
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Which of the following statements is correct?

1. 1 mole of electrons weights 5.4 mg 
2. 1 mole of electrons weights 5.4 kg 
3. 1 mole of electrons weights 0.54 mg 
4. 1 mole of electrons has 1.6×10-19 C of charge 

Subtopic:  Moles, Atoms & Electrons |
From NCERT
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Which of the following is the odd one with regard to mass?

1. 1 g atom of sulphur 

2. 0.5 moles of CO2 

3. 1 mole of O2 

4. 3 × 10 23 molecules of SO2

Subtopic:  Moles, Atoms & Electrons |
 57%
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The weight of one molecule of a compound C60H122 is

1. 5.005×1023 g

2. 6.023×1023 g

3. 4.1×10-21 g

4. 1.4×10-21g

 

Subtopic:  Moles, Atoms & Electrons |
 64%
From NCERT
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Breakfast cereal is advertised to contain 110 mg of sodium/ 100 grams of cereal. The percent of sodium in the cereal is 

(1) 0.110%

(2) 0.0110 %

(3) 11.0%

(4) 0.22 %

 

Subtopic:  Concentration Based Problem |
 72%
From NCERT
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The percentage weight of Zn in white vitriol [ZnSO4.7H2O] is approximately equal to (Zn=65, S=32, O=16 and H=1)

1. 21.56%

2. 32.58%

3. 22.65%

4. 26.55%

Subtopic:  Moles, Atoms & Electrons |
 68%
From NCERT
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A gaseous mixture contains O2 and N2 in the ratio 1:4 by weight. Then the ratio of their number of molecules in the mixture is

1. 3:32

2. 7:32

3. 1:4

4. 3:16

Subtopic:  Moles, Atoms & Electrons |
 77%
From NCERT
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1cc N2O at STP contains: 

1. \({1.32 \over 224} \times10^{23}~\mathrm{electrons}\) 2. \({6.02 \over 22400} \times10^{23}~\mathrm{molecules}\)
3. \({1.8 \over 224} \times10^{22}~\mathrm{atoms}\) 4. All of the above
Subtopic:  Moles, Atoms & Electrons |
 69%
From NCERT
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