Question # 1

Macromolecules are

Choose an answer

organic molecules

High molecular mass molecules

Natural compounds

Rarely occurring molecules

Which of the following statement is correct for a chemical reaction to occur molecules of substances must

Choose an answer

Collide with each other

Collide with energy more than activation energy

Collide with energy less than activation energy

Collide with high frequency

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

Choose an answer

C₃H₃O

C₆H₆O₂

C₉H₉O₃

C₃H₆O₂

In molecules kinetic and potential energies are:

Choose an answer

Definite

Moderate

Indefinite

None of above

A compound contains one atom of oxygen and % of O 34.78, then molecular mass of compound is

Choose an answer

46

78

110

180

The number of isotopes of gold is

Choose an answer

3

1

2

4

The mass of one mole of proton is

Choose an answer

1.008 g

0.184 g

1.673 g

1.008 mg

Choose an answer

N₂O₄is limiting reactant

N₂H₄is the limiting reactant

Reactants are completely converted to the products

Reactions is reversible

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

Choose an answer

2

8

10

13

Choose an answer

0 dm³

3 dm³

2 dm³

3 dm³

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

Choose an answer

x-rays

Video camera

Telescope

Compound microscope

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

Choose an answer

Empirical formula

Number of atoms in a molecules

Number of isomers

Relative molecular mass

The relative abundance of the ions with a definite m/e value is measured by

Choose an answer

High pressure of vapours

Strength of electric current measured

Quantity of fast moving electrons

Electron gas

First atomic theory was put forward by an English school teacher:

Choose an answer

Maxewell

Newton

Sanger

John Dalton

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

Choose an answer

Cation

Molecule

Neutral atom

Anion

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

Choose an answer

207.94

208.24

206.94

207.24

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

Choose an answer

1.661 x 10^{-27- Kg}

1.661 x 10^-24Kg

1.661 x 10^{-27- g}

1.661 x 10^-24mg

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

Choose an answer

1000 cm³

11000 cm³

1120 cm³

11200 cm³

Mass spectrometer measures the

Choose an answer

Exact mass of an element

Average mass of an element

The number of elements present in a molecule

m/e value of a positive ion

Isotopes differ in the

Choose an answer

Number of neutrons

Number of protons

Number of electrons

Number of atoms

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

Choose an answer

chesmistry

Geology

Physics

Mechanics

Where energy is released during a reaction it is

Choose an answer

Exothermic reaction

Endothermic reaction

A free radical reaction

A bond breaking reaction

Choose an answer

84.84 %

89.89%

81.81%

90.90%

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

Choose an answer

2.24 dm³

22.4 dm³

1.12 dm³

112 cm³

0.5 mole of CH₄and 0.5 mole of SO₂gases have equal

Choose an answer

Volume

Mass is gram

Total number of atoms

Number of molecules

One mole of SO₂contains

Choose an answer

6.02 x 10²³atoms of oxygen

18.1 x 10²³, molecules of SO₂

6.02 x 10²³atoms of sulphur

4 gram atoms of SO₂

Covalent compound s mostly exist in the form of:

Choose an answer

Protons

Atoms

Neutrons

Molecules

Al³⁺is a symbol for aluminium

Choose an answer

Atom

Ion

Cation

Anion

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

Choose an answer

2.8 g

2.4 g

1.4 g

14 g

Atoms and molecules can either gain or lose electrons, forming charge particles called:

Choose an answer

Positrons

Photons

Ions

Electrons

Matter is defined as any thing which occupies space and:

Choose an answer

Molecules

Mass

Compound

Molecules

More Classes

Other Links

ECAT Chemistry Chapter 1 Basic Concepts Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer