Question # 1

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

Choose an answer

2

8

10

13

A molecule of haemoglobin is made up if nearly

Choose an answer

10,000 atoms

50,000 atoms

2500 atoms

1500 atoms

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

Choose an answer

Ethanoic acid, CH₃CO₂H

Ethanol, CH₃CH₂OH

Glucose, C₆H₁₂O₆

Methanal, HCHO

The quantitative relationship between the substances according to balanced equation describes

Choose an answer

Reversible reactions

Stoichiometry

Limiting reacting

Percentage composition

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

Choose an answer

Maxewell

Newton

Sanger

John Dalton

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

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

A limiting reactant is one which according to the stoichiometric equation

Choose an answer

Has excess mass

Has least mass

Has excess number of moles

Has least number of moles

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

Choose an answer

C₂H₅OH

C₆H₅OH

HCOOH

Choose an answer

84.84 %

89.89%

81.81%

90.90%

One of the following statements is incorrect

Choose an answer

Actual yeild is always less than the theoretical yield

The formula of a compound is not definite

Law of conservation of mass is applied in stoictiometry

Boyles law is applied in stoichiometry

In molecules kinetic and potential energies are:

Choose an answer

Definite

Moderate

Indefinite

None of above

Which of the sub-atomic particles is not charged

Choose an answer

Electron

Proton

Neutron

All of them

Choose an answer

N₂O₄is limiting reactant

N₂H₄is the limiting reactant

Reactants are completely converted to the products

Reactions is reversible

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

Isotopes differ in the

Choose an answer

Number of neutrons

Number of protons

Number of electrons

Number of atoms

One mole of C₂H₅OH contains the number of H-atoms

Choose an answer

6.02 x 10²³

3.61 x 10²⁴

1.81 x 10²⁴

6.02 x 10²⁴

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

Choose an answer

Macro molecules

Mega molecules

Poly molecules

Gega molecules

NH₃, HCL, H₂O, HL are:

Choose an answer

Diatomic molecules

Poly-atomic molecules

Mono-atomic molecules

Hetero atomic molecules

Determination of atomic masses and invention of system of writing symbols was made by:

Choose an answer

J. Berzelius

Democritus

Dalton

None of above

Choose an answer

32 g

3.2 g

5.6 g

9.6 g

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

Choose an answer

3.01 x 10²³

1.5 x 10²³

6.02 x 10²⁴

3.01 x 10²⁴

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

Choose an answer

5 x 10^-8m

5 x 10^-9m

500 x 10^-7m

500 x 10^-9m

CO+ is an example of

Choose an answer

Stable molecule

Anionic molecule ion

Cationic molecular ion

Free radical

A species having positive or negative charge is called:

Choose an answer

Electron

Ion

Proton

Atom

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

Choose an answer

C₃H₃O

C₆H₆O₂

C₉H₉O₃

C₃H₆O₂

Which of the following compounds contains the highest percentage by mass of nitrogen?

Choose an answer

Ammonia, NH₃

Ammonium carbamate, NH₂CO₂NH₄

Ammonium carbonate, (NH₄)₂CO₃

Hydrazine, N₂H₄

The number of isotopes of gold is

Choose an answer

3

1

2

4

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

Choose an answer

6.02 x 10²³

3.01 x 10²³

6.02 x 10²⁴

3.01 x 10²⁴

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