ECAT Pre Engineering Chemistry Chapter 1 MCQ Test With Answer

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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	What is the volume in cm³of 3.01 x 10²³molecules of O₂gas at S.T.P	A. 1000 cm³ B. 11000 cm³ C. 1120 cm³ D. 11200 cm³
3	Objects of the size of an atom can be observed in	A. An electron microscope B. An x-ray spectrum C. Atomic absorption spectrum D. A visible spectrum
4		A. 8 g B. 16 g C. 32 g D. 24 g
5	Determination of atomic masses and invention of system of writing symbols was made by:	A. J. Berzelius B. Democritus C. Dalton D. None of above
6	The mass of one mole of proton is	A. 1.008 g B. 0.184 g C. 1.673 g D. 1.008 mg
7	Isotopes of an element differ in	A. Number of protons B. Number of electrons C. Number of neutrons D. Number of electrons and protons
8	Al³⁺is a symbol for aluminium	A. Atom B. Ion C. Cation D. Anion
9	Smallest particle of an element which may or may not have independent existence is known as:	A. A molecule B. An ion C. An atom D. An electron
10	A beaker contains 9 grams of water. The number of H-atoms is	A. 6.02 x 1023 B. 3.01 x 1023 C. 6.02 x 1024 D. 3.01 x 1024

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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

CL2, N2 and O2 are:

0.5 mole of CH4and 0.5 mole of SO2gases have equal

The negatively charged particles are called

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

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

The amount of products obtained from the balanced chemical equation is regarded as

Hemoglobin contains nearly:

The number of isotopes of gold is

The volume occupied by 1.4 g of N2 at S.T.P is

The atomic mass is measured in atomic mass unit (a.m.u.) which is equal to

Atoms can be evident by use of electron microscope, field ionization microscope and:

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

The quantitative relationship between the substances according to balanced equation describes

The largest number of molecules are present in

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

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

A species having positive or negative charge is called:

The mass of Al2S3formed when 20 grams Al reacts completely with S is

The pressure of vapours when sent to the ionization chamber in mass spectrometer is

When nitrogen is 5.6 grams in NO2. then number of moles of NO2is

When an electron is added to a uni positive ion we get:

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

0.5 mole of CH4and 0.5 mole of SO2gases have equal

The empirical formula of a compound is CH2O. What may be the compound

A limiting reactant is the one which

The mass of sulphur which combines with 24 grams oxygen to form SO2

The percentage of H is the highest in

Two different hydrocarbon each contain the same percentage by mass of hydrogen. It follows that they have the same

The mass of one mole of proton is

Covalent compound s mostly exist in the form of:

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CL₂, N₂ and O_{2 are:}

0.5 mole of CH₄and 0.5 mole of SO₂gases have equal

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

The volume occupied by 1.4 g of N₂at S.T.P is

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

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

The mass of Al₂S₃formed when 20 grams Al reacts completely with S is

When nitrogen is 5.6 grams in NO₂. then number of moles of NO₂is

The empirical formula of a compound is CH₂O. What may be the compound

The mass of sulphur which combines with 24 grams oxygen to form SO₂