Which of the following contains the highest number of helium atoms?

1. 4 u of helium
2. 4 g of helium
3. 2.27 L of helium at STP
4. 4 mol of helium
Subtopic:  Moles, Atoms & Electrons |
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1.0 g of \(H_2\) has same number of molecules as in:
1. 14 g of \(N_2\) 2. 18 g of \(H_2O\)
3. 16 g of CO  4. 28 g of \(N_2\)
Subtopic:  Moles, Atoms & Electrons |
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Match List-I with List-II:

List-I List-II
(a) 4.48 litres of O2 at STP (i) 0.2 moles
(b) 12.022 × 1022 molecules of H2O (ii) 12.044 × 1023 molecules
(c) 96 g of O2 (iii) 6.4 g
(d) 88 g of CO2 (iv) 67.2 litres at STP
(Given - Molar volume of a gas at STP - 22.4 L)
Choose the correct answer from the options given below:
(a) (b) (c) (d)
1. (i) (iii) (iv) (ii)
2. (iii) (i) (iv) (ii)
3. (iv) (i) (ii) (iii)
4. (iii) (i) (ii) (iv)
Subtopic:  Moles, Atoms & Electrons |
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What fraction of Fe exists as Fe(III) in Fe0.96O?
(Consider Fe0.96 to be made up of Fe(II) and Fe(III) only)
1.  \(\frac{1}{12}\)
2.  \(0.08\)
3.  \(\frac{1}{16}\)
4.  \(\frac{1}{20}\)
Subtopic:  Moles, Atoms & Electrons |
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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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One mole of carbon atom weights 12 g, the number of atoms in it is equal to:
(Mass of carbon – 12 is 1.9926×10-23 g)

1. 1.2×1023

2. 6.022×1022

3. 12×1022

4. 6.022×1023

Subtopic:  Moles, Atoms & Electrons |
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