Major Competitive Exams

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Major Competitive Exams

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Major Competitive Exams MCQ & Objective Questions

Major Competitive Exams play a crucial role in shaping the academic and professional futures of students in India. These exams not only assess knowledge but also test problem-solving skills and time management. Practicing MCQs and objective questions is essential for scoring better, as they help in familiarizing students with the exam format and identifying important questions that frequently appear in tests.

What You Will Practise Here

Key concepts and theories related to major subjects
Important formulas and their applications
Definitions of critical terms and terminologies
Diagrams and illustrations to enhance understanding
Practice questions that mirror actual exam patterns
Strategies for solving objective questions efficiently
Time management techniques for competitive exams

Exam Relevance

The topics covered under Major Competitive Exams are integral to various examinations such as CBSE, State Boards, NEET, and JEE. Students can expect to encounter a mix of conceptual and application-based questions that require a solid understanding of the subjects. Common question patterns include multiple-choice questions that test both knowledge and analytical skills, making it essential to be well-prepared with practice MCQs.

Common Mistakes Students Make

Rushing through questions without reading them carefully
Overlooking the negative marking scheme in MCQs
Confusing similar concepts or terms
Neglecting to review previous years’ question papers
Failing to manage time effectively during the exam

FAQs

Question: How can I improve my performance in Major Competitive Exams?
Answer: Regular practice of MCQs and understanding key concepts will significantly enhance your performance.

Question: What types of questions should I focus on for these exams?
Answer: Concentrate on important Major Competitive Exams questions that frequently appear in past papers and mock tests.

Question: Are there specific strategies for tackling objective questions?
Answer: Yes, practicing under timed conditions and reviewing mistakes can help develop effective strategies.

Start your journey towards success by solving practice MCQs today! Test your understanding and build confidence for your upcoming exams. Remember, consistent practice is the key to mastering Major Competitive Exams!

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Q. What is the molality of a solution prepared by dissolving 3 moles of KCl in 1 kg of water?

A. 3 m
B. 1.5 m
C. 2 m
D. 4 m

Solution

Molality (m) = moles of solute / kg of solvent = 3 moles / 1 kg = 3 m.

Correct Answer: A — 3 m

Q. What is the molality of a solution prepared by dissolving 5 moles of NaCl in 2 kg of water?

A. 2.5 mol/kg
B. 5 mol/kg
C. 1.5 mol/kg
D. 3 mol/kg

Solution

Molality (m) = moles of solute / mass of solvent (kg) = 5 moles / 2 kg = 2.5 mol/kg.

Correct Answer: A — 2.5 mol/kg

Q. What is the molar mass of CaCO3?

A. 100 g/mol
B. 120 g/mol
C. 80 g/mol
D. 60 g/mol

Solution

Molar mass of CaCO3 = 40 + 12 + 16*3 = 100 g/mol.

Correct Answer: A — 100 g/mol

Q. What is the molar mass of sulfuric acid (H2SO4)?

A. 98 g/mol
B. 96 g/mol
C. 100 g/mol
D. 92 g/mol

Solution

Molar mass = 2*1 + 32 + 4*16 = 98 g/mol.

Correct Answer: A — 98 g/mol

Q. What is the molar mass of the product formed when 1 mole of Mg reacts with 2 moles of HCl?

A. 24.3 g
B. 36.5 g
C. 58.5 g
D. 74.5 g

Solution

Mg + 2HCl → MgCl2 + H2. Molar mass of MgCl2 = 24.3 + 2*35.5 = 95.3 g.

Correct Answer: D — 74.5 g

Q. What is the molar mass of the product formed when 1 mole of nitrogen reacts with 3 moles of hydrogen?

A. 28 g
B. 14 g
C. 32 g
D. 18 g

Solution

N2 + 3H2 → 2NH3. Molar mass of NH3 = 14 + 3 = 17 g.

Correct Answer: A — 28 g

Q. What is the molar mass of water (H2O)?

A. 16 g/mol
B. 18 g/mol
C. 20 g/mol
D. 22 g/mol

Solution

The molar mass of water is calculated as follows: H (1 g/mol) x 2 + O (16 g/mol) = 18 g/mol.

Correct Answer: B — 18 g/mol

Q. What is the molar mass of water (H2O)? (2023) 2023

A. 16 g/mol
B. 18 g/mol
C. 20 g/mol
D. 22 g/mol

Solution

The molar mass of water is calculated as follows: H (1 g/mol) x 2 + O (16 g/mol) = 2 + 16 = 18 g/mol.

Correct Answer: B — 18 g/mol

Q. What is the molar volume of an ideal gas at standard temperature and pressure (STP)?

A. 22.4 L
B. 24.5 L
C. 18.0 L
D. 30.0 L

Solution

The molar volume of an ideal gas at STP is 22.4 L.

Correct Answer: A — 22.4 L

Q. What is the molar volume of an ideal gas at STP (Standard Temperature and Pressure)?

A. 22.4 L
B. 24.5 L
C. 18.0 L
D. 30.0 L

Solution

The molar volume of an ideal gas at STP is 22.4 L.

Correct Answer: A — 22.4 L

Q. What is the molar volume of an ideal gas at STP?

A. 22.4 L
B. 24.5 L
C. 18.0 L
D. 30.0 L

Solution

The molar volume of an ideal gas at standard temperature and pressure (STP) is 22.4 L.

Correct Answer: A — 22.4 L

Q. What is the molarity of a solution containing 5 moles of solute in 2 liters of solution?

A. 2.5 M
B. 5 M
C. 10 M
D. 0.5 M

Solution

Molarity (M) = moles of solute / liters of solution = 5 moles / 2 L = 2.5 M.

Correct Answer: A — 2.5 M

Q. What is the molarity of a solution containing 5 moles of solute in 2 liters of solution? (2021) 2021

A. 2.5 M
B. 5 M
C. 10 M
D. 1 M

Solution

Molarity (M) = moles of solute / liters of solution = 5 moles / 2 L = 2.5 M.

Correct Answer: A — 2.5 M

Q. What is the molarity of a solution containing 58.5 g of NaCl in 1 liter of solution? (2021)

A. 1 M
B. 0.5 M
C. 2 M
D. 0.1 M

Solution

Molarity (M) = moles of solute / liters of solution. Moles of NaCl = 58.5 g / 58.5 g/mol = 1 mol. Therefore, M = 1 mol / 1 L = 1 M.

Correct Answer: A — 1 M

Q. What is the molarity of a solution if 10 g of glucose (C6H12O6) is dissolved in 250 mL of water? (Molar mass = 180 g/mol)

A. 0.22 M
B. 0.5 M
C. 0.75 M
D. 1 M

Solution

Moles of glucose = 10 g / 180 g/mol = 0.0556 moles. Molarity = 0.0556 moles / 0.25 L = 0.222 M.

Correct Answer: A — 0.22 M

Q. What is the molarity of a solution if 10 grams of CaCl2 is dissolved in 250 mL of solution? (Molar mass of CaCl2 = 110 g/mol)

A. 0.25 M
B. 0.5 M
C. 1 M
D. 2 M

Solution

Moles of CaCl2 = 10 g / 110 g/mol = 0.0909 moles. Molarity = 0.0909 moles / 0.25 L = 0.3636 M.

Correct Answer: B — 0.5 M

Q. What is the molarity of a solution if 2 moles of solute are dissolved in 4 liters of solution?

A. 0.5 M
B. 1 M
C. 2 M
D. 4 M

Solution

Molarity (M) = moles of solute / liters of solution = 2 moles / 4 L = 0.5 M.

Correct Answer: B — 1 M

Q. What is the molarity of a solution if 5 moles of solute are dissolved in 2 liters of solution?

A. 2.5 M
B. 5 M
C. 10 M
D. 0.5 M

Solution

Molarity (M) = moles of solute / liters of solution = 5 / 2 = 2.5 M

Correct Answer: A — 2.5 M

Q. What is the molarity of a solution prepared by dissolving 5 grams of NaCl in enough water to make 250 mL of solution? (Molar mass of NaCl = 58.5 g/mol) (2023)

A. 0.34 M
B. 0.42 M
C. 0.25 M
D. 0.50 M

Solution

Molarity (M) = moles of solute / liters of solution. Moles of NaCl = 5 g / 58.5 g/mol = 0.0855 moles. Volume of solution = 250 mL = 0.250 L. M = 0.0855 moles / 0.250 L = 0.342 M, approximately 0.34 M.

Correct Answer: A — 0.34 M

Q. What is the molarity of a solution prepared by dissolving 5 moles of NaCl in 2 liters of water?

A. 2.5 M
B. 5 M
C. 10 M
D. 1 M

Solution

Molarity (M) = moles of solute / liters of solution = 5 moles / 2 L = 2.5 M.

Correct Answer: A — 2.5 M

Q. What is the mole fraction of solute in a solution containing 2 moles of solute and 8 moles of solvent?

A. 0.2
B. 0.25
C. 0.5
D. 0.1

Solution

Mole fraction of solute = moles of solute / (moles of solute + moles of solvent) = 2 / (2 + 8) = 2 / 10 = 0.2.

Correct Answer: B — 0.25

Q. What is the mole fraction of solute in a solution containing 3 moles of solute and 7 moles of solvent?

A. 0.3
B. 0.7
C. 0.5
D. 0.2

Solution

Mole fraction of solute = moles of solute / total moles = 3 / (3 + 7) = 0.3.

Correct Answer: A — 0.3

Q. What is the molecular formula of benzene?

A. C6H6
B. C6H12
C. C6H10
D. C6H8

Solution

Benzene has the molecular formula C6H6, indicating it is an aromatic hydrocarbon.

Correct Answer: A — C6H6

Q. What is the molecular formula of Benzoic acid?

A. C6H5COOH
B. C7H6O2
C. C6H6O
D. C6H4O2

Solution

The molecular formula of Benzoic acid is C7H6O2.

Correct Answer: B — C7H6O2

Q. What is the molecular formula of butan-2-one?

A. C4H8O
B. C4H10O
C. C4H6O
D. C4H12O

Solution

The molecular formula of butan-2-one is C4H8O.

Correct Answer: A — C4H8O

Q. What is the molecular formula of butanoic acid?

A. C3H6O2
B. C4H8O2
C. C5H10O2
D. C6H12O2

Solution

The molecular formula of butanoic acid is C4H8O2.

Correct Answer: B — C4H8O2

Q. What is the molecular formula of cyclohexane? (2022)

A. C6H12
B. C6H10
C. C6H14
D. C6H6

Solution

Cyclohexane is a cyclic alkane with the formula C6H12.

Correct Answer: A — C6H12

Q. What is the molecular formula of ethylene?

A. C2H2
B. C2H4
C. C3H6
D. C4H8

Solution

Ethylene is an alkene with the molecular formula C2H4.

Correct Answer: B — C2H4

Q. What is the molecular formula of ethyne? (2022)

A. C2H2
B. C2H4
C. C2H6
D. C3H4

Solution

Ethyne, also known as acetylene, has the molecular formula C2H2.

Correct Answer: A — C2H2

Q. What is the molecular formula of formaldehyde?

A. C2H4O
B. CH2O
C. C3H6O
D. C4H8O

Solution

The molecular formula of formaldehyde is CH2O.

Correct Answer: B — CH2O

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