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NEET Previous Year Questions (2014-2024): Some Basic Concepts of Chemistry | Chemistry Class 11 PDF Download

Q.1. Select the correct statements from the following      (2023)
A. Atoms of all elements are composed of two fundamental particles.
B. The mass of the electron is 9.10939 × 10–31 kg.
C. All the isotopes of a given element show same chemical properties.  
D. Protons and electrons are collectively known as nucleons.  
E. Dalton’s atomic theory, regarded the atom as an ultimate particle of matter.
Choose the correct answer from the options given below  
(a) A, B and C only
(b) C, D and E only
(c) A and E only
(d) B, C and E only
Ans: 
d

  • Atoms consist of three fundamental particles:  Electrons, protons and neutrons
  • The mass of the electron is 9.10939 × 10–31 kg
  • All the isotopes of a given element show same chemical properties.
  • Protons and neutrons present in the nucleus are collectively called as nucleons.  
  • Dalton’s atomic theory, regarded the atom as the ultimate particle of matter.
    So, the correct statements are B, C, E only 

Question for NEET Previous Year Questions (2014-2024): Some Basic Concepts of Chemistry
Try yourself:Q.2. The right option for the mass of CO2 produced by heating 20 g of 20% pure limestone is (Atomic mass of Ca = 40)     (2023)
NEET Previous Year Questions (2014-2024): Some Basic Concepts of Chemistry | Chemistry Class 11
View Solution

Q.3. What mass of 95% pure CaCO3 will be required to neutralise 50 mL of 0.5 M HCl solution according to the following reactions?
NEET Previous Year Questions (2014-2024): Some Basic Concepts of Chemistry | Chemistry Class 11
[Calculate upto second place of decimal point]    (2022)
(a) 3.65 g
(b) 9.50 g
(c) 1.25 g
(d) 1.32 g
Ans: 
d
NEET Previous Year Questions (2014-2024): Some Basic Concepts of Chemistry | Chemistry Class 11

Q.4. An organic compound contains 80% (by wt.) carbon and the remaining percentage of hydrogen. The right option for the empirical formula of this compound is: [Atomic wt. of C is 12, H is 1]     (2021)
(a) CH3
(b) CH4
(c) CH
(d) CH2
Ans: 
a
An empirical formula represents the simplest whole number ratio of various atoms present in a compound, whereas, the molecular formula shows the exact number of different types of atoms present in a molecule of a compound.

Q.5. 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
NEET Previous Year Questions (2014-2024): Some Basic Concepts of Chemistry | Chemistry Class 11
(b) no. of atoms
NEET Previous Year Questions (2014-2024): Some Basic Concepts of Chemistry | Chemistry Class 11
(c) no. of atoms
NEET Previous Year Questions (2014-2024): Some Basic Concepts of Chemistry | Chemistry Class 11
(d) no. of atoms
NEET Previous Year Questions (2014-2024): Some Basic Concepts of Chemistry | Chemistry Class 11
∴ 1 gm of Li is having maximum no. of atoms.

Q.6. 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
NEET Previous Year Questions (2014-2024): Some Basic Concepts of Chemistry | Chemistry Class 11
20 moles need to be produced
2 moles of NH3 → 3 moles of H2
Hence 20 moles of NEET Previous Year Questions (2014-2024): Some Basic Concepts of Chemistry | Chemistry Class 11 moles of H2

Q.7. 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
NEET Previous Year Questions (2014-2024): Some Basic Concepts of Chemistry | Chemistry Class 11
NEET Previous Year Questions (2014-2024): Some Basic Concepts of Chemistry | Chemistry Class 11

Q.8. 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
NEET Previous Year Questions (2014-2024): Some Basic Concepts of Chemistry | Chemistry Class 11

Question for NEET Previous Year Questions (2014-2024): Some Basic Concepts of Chemistry
Try yourself:Q.9. 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)
View Solution


Q.10. 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.
NEET Previous Year Questions (2014-2024): Some Basic Concepts of Chemistry | Chemistry Class 11
Here, Cl2 is limiting reagent. So, 1 mole of HCI(g) is formed.

The document NEET Previous Year Questions (2014-2024): Some Basic Concepts of Chemistry | Chemistry Class 11 is a part of the NEET Course Chemistry Class 11.
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FAQs on NEET Previous Year Questions (2014-2024): Some Basic Concepts of Chemistry - Chemistry Class 11

1. What are some basic concepts of chemistry?
Ans. Some basic concepts of chemistry include elements, compounds, mixtures, atoms, molecules, chemical reactions, and the periodic table.
2. What is the difference between an element and a compound?
Ans. An element is a pure substance made up of only one type of atom, while a compound is a substance made up of two or more different types of atoms chemically bonded together.
3. How do atoms and molecules differ in chemistry?
Ans. Atoms are the smallest units of matter that retain the properties of an element, while molecules are made up of two or more atoms chemically bonded together.
4. What is the significance of the periodic table in chemistry?
Ans. The periodic table organizes elements based on their atomic number, electron configuration, and recurring chemical properties, making it a vital tool for understanding the behavior of elements.
5. What is the role of chemical reactions in chemistry?
Ans. Chemical reactions involve the breaking and forming of bonds between atoms, resulting in the transformation of reactants into products. This process is crucial for understanding the behavior and interactions of various substances in chemistry.
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