# If 2.74 g of the metal oxide contains 1.53 g of metal, then the empirical formula of vanadium oxide is: (Atomic Mass of V = 52) 1. ${\mathrm{V}}_{2}{\mathrm{O}}_{3}$ 2. $\mathrm{VO}$ 3. ${\mathrm{V}}_{2}{\mathrm{O}}_{5}$ 4. ${\mathrm{V}}_{2}{\mathrm{O}}_{7}$

Subtopic:  Empirical & Molecular Formula |
59%
From NCERT
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To produce 20 moles of ammonia via Haber's process, how many moles of hydrogen molecules are required?

 1 40 mol 2 10 mol 3 20 mol 4 30 mol
Subtopic:  Limiting Reagent | Equation Based Problem |
80%
From NCERT
NEET - 2019
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The volume of oxygen gas (O2) needed to completely burn 1 L of propane gas (C3H8)  (both O& propane measured at 0°C and 1 atm) will be:
1. 7 L
2. 6 L
3. 5 L
4. 10 L

Subtopic:  Equation Based Problem |
77%
From NCERT
AIPMT - 2008
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10 g of hydrogen and 64 of oxygen were filled in a steel vessel and exploded. The amount of water produced in this reaction will be:

1. 2 mol

2. 3 mol

3. 4 mol

4. 1 mol

Subtopic:  Limiting Reagent |
75%
From NCERT
AIPMT - 2009
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If Avogadro number $$N_{A}$$, is changed from $$6 . 022 \times \left(10\right)^{23}$$$$\text{mol}^{- 1}$$ to $$6 . 022 \times \left(10\right)^{20} ~\text{mol}^{- 1}$$ 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 |
72%
From NCERT
NEET - 2015
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The density of a 2 M aqueous solution of NaOH is 1.28 g/$c{m}^{3}$. The molality of the solution is:
[molecular mass of NaOH = 40 $gmo{l}^{-1}$]

 1 1.20 m 2 1.56 m 3 1.67 m 4 1.32 m
Subtopic:  Concentration Based Problem |
70%
From NCERT
NEET - 2019
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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 |
79%
From NCERT
NEET - 2020
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In the reaction, 4NH3(g)+ 5O2(g) $\to$4NO(g) +6H2O(l)

When 1 mole of ammonia and 1 mole of O2  reacts to completion, then:

 1 1.0 mole of H2O is produced. 2 1.0 mole of NO will be produced. 3 All the oxygen will be consumed. 4 All the ammonia will be consumed.

Subtopic:  Equation Based Problem |
69%
From NCERT
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The mole fraction of the solute in a 1.00 molal aqueous solution is:

 1 0.00177 2 0.0344 3 0.0177 4 0.177
Subtopic:  Concentration Based Problem |
From NCERT
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Concentrated nitric acid is 70% HNO3. The amount of concentrated nitric acid solution that should be used to prepare 250 mL of 2.0 M HNO3 would be:

1. 90.0 g conc. HNO3
2. 70.0 g conc. HNO3
3. 54.0 g conc. HNO3
4. 45.0 g conc. HNO3

Subtopic:  Concentration Based Problem |
From NCERT
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