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	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
2	The empirical formula of a liquid compound is known to be C₂H₄O. What other information is needed to work out its molecular formula?	A. The percentage composition of the compound B. The relative molecular mass of the compound C. The density of the compound D. The volume occupied by one mole of the compound
3	A balloon contains 0.02 gram of H₂gas, it contains H₂molecules	A. 6.02 x 10²³ B. 3.01 x 10²² C. 6.02 x 10²¹ D. 3.01 x 10²¹
4	The number of subatomic particles in atoms sidcovered is more than:	A. 110 B. 100 C. 125 D. 90
5		A. 84.84 % B. 89.89% C. 81.81% D. 90.90%
6	If four moles of sulpur dioxide are oxidised to sulphur trioxide, how many moles of oxygen molecules are required	A. 0.5 B. 1.0 C. 1.5 D. 2.0
7	Each molecule of haemoglobin is 68000 times heavier than one atom of	A. C B. H C. N D. O
8	Isotopes differ in	A. properties which depend upon mass B. arrangement of electrons in orbitals C. chemical properties D. the extent to which they may be affected in electric fields
9	Formation of a cation is:	A. Exothermic process B. Non-endothermic process C. Endothermic process D. None of above
10	The value of R(General Gas Constant) is	A. 8.3134 JK^-1mole^-1 B. 1.987 Cal K^-1Mole^-1 C. Both a and b D. 1.987 JK^-1mole^-1

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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

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

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

Macromolecules are

Relative atomic mass of an element is the mass of the element relative to

Benzene is stable to:

CL2, N2 and O2 are:

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

The largest number of molecules are present in

The relative atomic mass of chlorine is 35.5. What is the mass of 2 mol of chlorine gas

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

One mole of C2H5OH contains the number of H-atoms

Which of the sub-atomic particles is not charged

Molecules of High molecular weight usually greater than 10,000 are called:

A limiting reactant is one which according to the stoichiometric equation

0.5 mole of CH4and 0.5 mole of SO2gases have equal

A compound having empirical formula C3H3O and its molecular mass is 110.02. Its molecular formula is

Which one of the following statements is not correct

The atom of an element is

3.01 x 1022Ag+ions is present in

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

Hemoglobin contains nearly:

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

Which one of the following compounds does not have the empirical formula CH2O?

The phenomenon of isotropy was first discovered by

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

Al3+is a symbol for aluminium

Isotopes of an element differ in

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

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

Which statement about molecule is incorrect ?

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ECAT Chemistry Chapter 1 Important MCQ's

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

CL₂, N₂ and O_{2 are:}

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

One mole of C₂H₅OH contains the number of H-atoms

0.5 mole of CH₄and 0.5 mole of SO₂gases have equal

A compound having empirical formula C₃H₃O and its molecular mass is 110.02. Its molecular formula is

3.01 x 10²²Ag⁺ions is present in

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

Which one of the following compounds does not have the empirical formula CH₂O?

Al³⁺is a symbol for aluminium

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