Previous Year Questions (2014-20): Some Basic Concepts of Chemistry NEET Notes | EduRev

Chemistry 31 Years NEET Chapterwise Solved Papers

NEET : Previous Year Questions (2014-20): Some Basic Concepts of Chemistry NEET Notes | EduRev

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Q.1. Which one of the followings has maximum number of atoms?     (2020)
(a) 1g of O2(g) (Atomic mass of O = 16) 
(b) 1g of Li(s) (Atomic mass of Li = 7) 
(c) 1g of Ag(s) (Atomic mass of Ag = 108) 
(d) 1g of Mg(s) (Atomic mass of Mg = 24)
Ans: b
(a) no. of atoms
Previous Year Questions (2014-20): Some Basic Concepts of Chemistry NEET Notes | EduRev
(b) no. of atoms
Previous Year Questions (2014-20): Some Basic Concepts of Chemistry NEET Notes | EduRev
(c) no. of atoms
Previous Year Questions (2014-20): Some Basic Concepts of Chemistry NEET Notes | EduRev
(d) no. of atoms
Previous Year Questions (2014-20): Some Basic Concepts of Chemistry NEET Notes | EduRev
∴ 1 gm of Li is having maximum no. of atoms.

Q.2. The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber's process is :    (2019)
(a) 10
(b) 20
(c) 30
(d) 40
Ans: 
c
Haber's process
Previous Year Questions (2014-20): Some Basic Concepts of Chemistry NEET Notes | EduRev
20 moles need to be produced
2 moles of NH3 → 3 moles of H2
Hence 20 moles of Previous Year Questions (2014-20): Some Basic Concepts of Chemistry NEET Notes | EduRev moles of H2

Q.3. In which case is the number of molecules of water maximum?    (2018)
(a) 18 mL of water
(b) 0.18 g of water
(c) 0.00224 L of water vapours at 1 atm and 273 K
(d) 10-3 mol of water
Ans:
a
Previous Year Questions (2014-20): Some Basic Concepts of Chemistry NEET Notes | EduRev
Previous Year Questions (2014-20): Some Basic Concepts of Chemistry NEET Notes | EduRev

Q.4. A mixture of gases contains H2 and O2 gases in the ratio of 1 : 4 (w/w). What is the molar ratio of the two gases in the mixture ?    (2015)
(a) 2:1

(b) 1:4
(c) 4:1
(d) 16:1
Ans: c
Previous Year Questions (2014-20): Some Basic Concepts of Chemistry NEET Notes | EduRev

Q.5. 1.0 g of magnesium is burnt with 0.56 g O2 in a closed vessel. Which reactant is left in excess and how much ?    (2014)
(At. wt. Mg = 24; O = 16)
(a) Mg, 0.44 g
(b) O2, 0.28 g
(c) Mg, 0.16 g
(d) O2, 0.16 g

Ans: c
Previous Year Questions (2014-20): Some Basic Concepts of Chemistry NEET Notes | EduRev

Q.6. When 22.4 litres of H2 (g) is mixed with 11.2 litres of Cl2 (g) , each at S.T.P., the moles of HCl (g) formed is equal to :    (2014)
(a) 0.5 mol of HCl (g)
(b) 1.5 mol of HCl (g)
(c) 1 mol of HCl (g)
(d) 2 mol of HCl (g)

Ans: c
1 mole = 22.4 liters at S.T.P.
Previous Year Questions (2014-20): Some Basic Concepts of Chemistry NEET Notes | EduRev
Here, Cl2 is limiting reagent. So, 1 mole of HCI(g) is formed.

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