ECAT Pre Engineering Chemistry Chapter 1 MCQ Test With Answer

Top Scorers Of ECAT Chemistry Chapter 1 Basic Concepts MCQ`s Test

• F

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• Z

  zakee 09u 28 - Nov - 2024 18 Min 56 Sec 95/120

• H

  habib rehman 17 - Apr - 2026 24 Min 01 Sec 92/120

• A

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• I

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• N

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• U

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• M

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• A

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• A

  abdullah masood 04 - Dec - 2024 10 Min 54 Sec 70/120

• M

  Muhammad Awais 01 - Jan - 2025 05 Min 43 Sec 65/120

• A

  Aqsa afridi 02 - Dec - 2024 24 Min 01 Sec 65/120

• S

  shahmeer Ch 17 - Jun - 2026 08 Min 55 Sec 64/120

ECAT Chemistry Chapter 1 Important MCQ's

Sr.#	Question	Answer
1	Which one of the following statements is not correct	A. A molecule is the smallest particle of an element which can exist independently B. He is a molecule of helium C. S8is a molecule of sulphur D. O3is a molecule of oxygen
2	Which of the sub-atomic particles is not charged	A. Electron B. Proton C. Neutron D. All of them
3	One mole of C2H5OH contains the number of H-atoms	A. 6.02 x 1023 B. 3.61 x 1024 C. 1.81 x 1024 D. 6.02 x 1024
4	Isotopes differ in the	A. Number of neutrons B. Number of protons C. Number of electrons D. Number of atoms
5		A. 84.84 % B. 89.89% C. 81.81% D. 90.90%
6	Which one of the following step is not involved in determination of empirical formula	A. Determination % of each element B. Determination of gram atom of each element C. Determination of isotopes of each element D. Determination of atomic ratio of element
7	The percentage of which element in the organic compound is determined by the difference method	A. Carbon B. Hydrogen C. Nitrogen D. Oxygen
8	The mass of Al2S3formed when 20 grams Al reacts completely with S is	A. 60 g B. 50 g C. 50.55 g D. 55.55 g
9	The negatively charged particles are called	A. Cation B. Radical C. Anion D. Positron
10	Ascorbic acid contains 40.92% carbon, 4.58%, hydrogen and 54.4% oxygen. The empirical formula is	A. C3H4O3 B. C2H4O3 C. C3H5O4 D. C2H3O1