100 questions - mole Concept( JEE/NEET)

100 Mole Concept Questions

(SET 1)
1.Number of molecules present in 6.6 g of CO₂ is:


(A) 9.12×10²² (B) 1.32×10²³ (C) 3.01×10²² (D)
6.02×10²²


2. Number of atoms in 0.2 mole of Ca(NO₃)₂ is:


(A) 0.6 Nₐ (B) 1.2 Nₐ (C) 0.8 Nₐ (D) 3.6 Nₐ


3. Mass of 4.5×10²² molecules of SO₂ is:


(A) 4.8 g (B) 3.2 g (C) 1.2 g (D) 2.4 g


4. Number of ions formed when 0.01 mole of
Al₂(SO₄)₃ is dissolved:


(A) 0.04 Nₐ (B) 0.05 Nₐ (C) 0.06 Nₐ (D) 0.07 Nₐ

,5. Volume occupied by 4 g of CH₄ at STP is:


(A) 4.48 L (B) 8.96 L (C) 2.24 L (D) 1.12 L


6. Number of neutrons in 3.01×10²³ atoms of ³⁵Cl
is:


(A) 10 Nₐ (B) 17 Nₐ (C) 18 Nₐ (D) 35 Nₐ


7. Mass of nitrogen atoms present in 1 mole of
NH₄NO₃ is:


(A) 14 g (B) 28 g (C) 42 g (D) 56 g


8. How many moles of O-atoms are present in 49 g
of H₂SO₄?


(A) 2 (B) 3 (C) 4 (D) 6

, 9. Number of molecules in 88 g of CO₂ is:


(A) 1 Nₐ (B) 2 Nₐ (C) 3 Nₐ (D) 4 Nₐ


10. Moles of electrons in 9.6 g of Mg (Mg = 24):


(A) 0.8 (B) 1.6 (C) 2.4 (D) 4.8




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11. 0.5 mole of gas contains how many atoms if
the gas is PCl₅?


(A) 1.5 Nₐ (B) 2.5 Nₐ (C) 3 Nₐ (D) 5 Nₐ


12. 3 g of hydrogen contains:


(A) 1.5 Nₐ molecules (B) 3 Nₐ atoms (C) 1.5 Nₐ
atoms (D) 0.75 Nₐ molecules