NEET Moles, Atoms & Electrons Practice Questions With Solutions

NEET Chemistry Moles, Atoms & Electrons Practice Questions

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Question 1.

1.0 g of $H_2$ has same number of molecules as in:

A14 g of $N_2$

B18 g of $H_2O$

C16 g of CO

D28 g of $N_2$

Question 2.

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

A4 u of helium

B4 g of helium

C2.27 L of helium at STP

D4 mol of helium

Question 3.

What fraction of Fe exists as Fe(III) in Fe_0.96O? (Consider Fe_0.96 to be made up of Fe(II) and Fe(III) only)

A$\dfrac{1}{12}$

B$0.08$

C$\dfrac{1}{16}$

D$\dfrac{1}{20}$

Question 4.

One mole of carbon atom weights 12 g, the number of atoms in it is equal to:
(Mass of carbon – 12 is

1.9926 \times 10^{- 23}

g

)

A

1.2 \times 10^{23}

B

6.022 \times 10^{22}

C

12 \times 10^{22}

D

6.022 \times 10^{23}

Question 5.

The maximum number of atoms is present in which of the following -

A1 g of Mg_(s)

B1 g of O₂_(g)

C1 g of Li_(s)

D1 g of Ag_(s)

Question 6.

The maximum number of water molecules among the following is:

A18 mL of water

B0.18 g of water

C0.00224 L water vapours at 1 atm and 273 K

D10^-3mol of water

Question 7.

A mixture of gases contains H₂ and O₂ gases in the ratio of 1 : 4 (w/w). The molar ratio of the two gases in the mixture will be:

A1:4

B4:1

C16:1

D2:1

Question 8.

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 the:

Adefinition of mass in units of grams.

Bmass of one mole of carbon.

Ccoefficient of chemical species in a balanced equation.

Dratio of elements in a compound.

Question 9.

The number of water molecules are maximum in:

A18 molecules of water

B1.8 g of water

C18 g of water

D18 moles of water

Question 10.

When 22.4 litres of H₂(g) is mixed with 11.2 litres of Cl₂(g), both at STP, the moles of HCl(g) formed are equal to:

A1 mol of HCl(g)

B2 mol of HCl(g)

C0.5 mol of HCl(g)

D1.5 mol of HCl(g)

Question 1.

1.0 g of magnesium is burnt with 0.56 g O₂ in a closed vessel. Which reactant is left in excess and by how much? (At. wt. Mg = 24; O = 16)

AMg, 0.16 g

B

O_{2}

, 0.16 g

CMg, 0.44 g

D

O_{2}

, 0.28 g

Question 2.

The number of atoms in 0.1 mole of a triatomic gas is (N_A= 6.02 x 10²³ mol^-1):

A

6.026 \times 10^{22}

B

1.806 \times 10^{23}

C

3.600 \times 10^{23}

D

1.800 \times 10^{22}

Question 3.

The maximum number of molecules is present in:

A5L of N₂ gas at STP

B0.5 g of H₂ gas

C10g of O₂ gas

D15 L of H₂ gas at STP

Question 4.

Which among the following has the maximum number of molecules?

A7 gm N₂

B2 gm H₂

C16 gm NO₂

D16 gm O₂

Question 5.

The specific volume of cylindrical virus particle is $6.02$ $\times$ $10^{- 2}$ $c c / g m w$ hose radius and length are 7 Å & 10Å respectively. If $N_{A}$ $=$ $6.023$ $\times 10^{23}$ $\text{mol}^{-1}$, find the molecular weight.

A$ 15.4 \mathrm{~kg} / \mathrm{mol} $

B$1.54 \times 10^4 \mathrm{~kg} / \mathrm{mol} $

C$ 3.08 \times 10^4 \mathrm{~kg} / \mathrm{mol}$

D$3.08 \times 10^3 \mathrm{~kg} / \mathrm{mol}$

Question 6.

The mole ratio of H₂ and O₂ gas is 8:1. The ratio of their weight will be:

A1 : 1

B2 : 1

C4 : 1

D1 : 2

NEET Moles, Atoms & Electrons Practice Questions With Solutions

NEET Chemistry Moles, Atoms & Electrons Practice Questions

Question 1.

Question 2.

Question 3.

Question 4.

Question 5.

Question 6.

Question 7.

Question 8.

Question 9.

Question 10.

Question 1.

Question 2.

Question 3.

Question 4.

Question 5.

Question 6.

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