Which has the maximum number of molecules?

1. 7g N

2. 2g H

3. 16g NO

4. 16g O

Subtopic:  Moles, Atoms & Electrons |
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NEET 2021 - Achiever Batch - Aryan Raj Singh
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NEET 2021 - Achiever Batch - Aryan Raj Singh

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What volume of  oxygen gas (O2) measured at 0°C and 1 atm, is needed to burn completely 1L of  propane gas (C3H8) measured under the same conditions?

1. 7L 

2. 6L

3. 5L

4. 10L

Subtopic:  Equation Based Problem |
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Volume occupied by one molecule of water (density = 1gcm-3) is 

1. 9.0 x 10-23 cm3

2. 6.023 x 10-23 cm3

3. 3.0 x 10-23 cm3

4. 5.5 x 10-23 cm3

Subtopic:  Moles, Atoms & Electrons |
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A metal oxide has the formula Z2O3. It can be reduced by hydrogen to give free metal and water. 0.1596g of the metal oxide requires 6 mg of hydrogen for complete reduction. The atomic weight of the metal is

1. 27.9

2. 159.6

3. 79.8

4. 55.8

Subtopic:  Equivalent Concept |
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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. 0.033

3. 0.011

4. 0.029

Subtopic:  Equation Based Problem |
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The product of atomic mass and specific heat of metal is approximately 6.4. This was given by:

1. Dalton's law

2. Avogadro's law

3. Newton's law

4. Dulong Petit's law

Subtopic:  Moles, Atoms & Electrons |
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One litre N2, 7/8 litre O2 and 1 litre CO are taken in a mixture under indentical conditions of P and T. The amount of gases present in mixture is given by:

1. ωN2=ωO2>ωCO 

2. ωN2=ωCO>ωO2 

3. ωN2=ωO2=ωCO

4. ωCO>ωN2>ωO2

Subtopic:  Moles, Atoms & Electrons |
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A solution contains Na2CO3 and NaHCO3. 10 mL of the solution required 2.5 mL of 0.1 M H2SO4 for neutralisation using phenolphthalein as indicator. Methyl orange is then added when a further 2.5 mL of 0.2 M H2SO4 was required. The amount of Na2CO3 and NaHCO3 in 1 litre of the solution is:

1. 5.3g and 4.2g

2. 3.3g and 6.2g

3. 4.2g and 5.3g

4. 6.2g and 3.3g

Subtopic:  Equivalent Concept |
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Versene, a chelating agent having chemical formula C2H4N2(C2H2O2Na)4. If each mole of this compound could bind 1 mole of Ca2+, then the rating of pure versene expressed as mg of CaCO3 bound per g of chelating agent is:

1. 100 mg

2. 163 mg

3. 200 mg

4. 263 mg

Subtopic:  Equation Based Problem |
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A gas is found to have the formula (CO)x. Its VD is 70. The value of x must be:

1. 7 

2. 4

3. 5

4. 6

Subtopic:  Moles, Atoms & Electrons |
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