ECAT Pre Engineering Chemistry Chapter 1 MCQ Test With Answer

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habib rehman 17 - Apr - 2026 24 Min 01 Sec 92/120
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ECAT Chemistry Chapter 1 Important MCQ's

Sr.#	Question	Answer
1	First atomic theory was put forward by an English school teacher:	A. Maxewell B. Newton C. Sanger D. John Dalton
2	He Ar and Ne are:	A. Mono-atomic molecules B. Hetero atomic molecules C. Poly-atomic molecules D. Diatomic molecules
3	When an electron is added to a uni positive ion we get:	A. Cation B. Molecule C. Neutral atom D. Anion
4	One of the following statements is incorrect	A. Actual yeild is always less than the theoretical yield B. The formula of a compound is not definite C. Law of conservation of mass is applied in stoictiometry D. Boyles law is applied in stoichiometry
5	The relative abundance of Pb isotopes is 1.5% Pb²⁰⁴, 23.6% Pb²⁰⁶, 22.6% Pb²⁰⁷, 52.3% Pb²⁰⁸The relative atomic mass of Pb is	A. 207.94 B. 208.24 C. 206.94 D. 207.24
6	The number of subatomic particles in atoms sidcovered is more than:	A. 110 B. 100 C. 125 D. 90
7	Which has greater number of moles	A. 0.1 g sodium B. 6.02 x 10²⁰atoms of magnesium C. 20 cm³0.1mole per dm³of NaOH D. 12.2 dm³of nitrogen at standard [A_rNa = 23, Mg = 24, O = 16]
8	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
9	The empirical formula of a compound is CH₂O. What may be the compound	A. C₂H₅OH B. C₆H₅OH C. HCOOH
10		A. 300 cm³ B. 200 cm³ C. 150 cm³ D. 100 cm³

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ECAT Pre Engineering Chemistry Chapter 1 MCQ Test With Answer

MCQ's Test For ECAT Chemistry Chapter 1 Basic Concepts

ECAT Chemistry Chapter 1 Basic Concepts

Which has greater number of moles

CL2, N2 and O2 are:

An ion bearing positive charge is called:

Which of the sub-atomic particles is not charged

One mole of C2H5OH contains the number of H-atoms

Hemoglobin is 68000 times heavier than:

How many moles of hydrogen atoms does 3.2 g of methane, CH4, contain?

NH3, HCL, H2O, HL are:

The empirical formula of a liquid compound is known to be C2H4O. What other information is needed to work out its molecular formula?

A ring contains 3 gram diamond. The number of C-atoms which a ring contains is

When 0.1 g of magnesium is treated with an excess of hydrochloric acid, what volume of gas at room temperature and pressure will be produced

How many moles of oxygen, O2are needed for the complete combustion of two moles of butane C4H10?

Each molecule of haemoglobin is 68000 times heavier than one atom of

One mole of SO2contains

What is the volume in cm3of 3.01 x 1023molecules of O2gas at S.T.P

The value of R(General Gas Constant) is

The percentage of H is the highest in

A beaker contains 9 grams of water. The number of H atoms is

The largest number of molecules are present in

Which one of the following statements is not correct

The branch of science dealing with structure, composition and changes in matter and laws and principles which govern these changes is called as

Covalent compound s mostly exist in the form of:

A limiting reactant is the one which

Which statement about molecule is incorrect ?

1.12 dm3of N2gas at S.T.P. has mass of N2gas

A limiting reactant is one which according to the stoichiometric equation

The wave length of visible light is 500 nm. In S.I. unit this value is

One of the following statements is incorrect

Ascorbic acid contains 40.92% carbon, 4.58%, hydrogen and 54.4% oxygen. The empirical formula is

Which one of the following step is not involved in determination of empirical formula

Prepare Complete Set Wise ECAT Chemistry Chapter 1 Basic Concepts MCQs Online With Answers

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

ECAT Chemistry Chapter 1 Important MCQ's

Test Questions

CL₂, N₂ and O_{2 are:}

One mole of C₂H₅OH contains the number of H-atoms

How many moles of hydrogen atoms does 3.2 g of methane, CH₄, contain?

NH₃, HCL, H₂O, HL are:

The empirical formula of a liquid compound is known to be C₂H₄O. What other information is needed to work out its molecular formula?

How many moles of oxygen, O₂are needed for the complete combustion of two moles of butane C₄H₁₀?

One mole of SO₂contains

What is the volume in cm³of 3.01 x 10²³molecules of O₂gas at S.T.P

1.12 dm³of N₂gas at S.T.P. has mass of N₂gas