Question # 1

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

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Theoretical yield

Actual yield

% yield

Experimental yield

CO+ is an example of

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Stable molecule

Anionic molecule ion

Cationic molecular ion

Free radical

A compound contains 75% carbon and 25% hydrogen, by mass. What is the molecular formula of the compound/

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C₃H₈

CH₄

C₂H₄

C₂H₆

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

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10 cm³

25 cm³

48 cm³

100 cm³

The mass of one mole of proton is

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1.008 g

0.184 g

1.673 g

1.008 mg

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

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60 g

50 g

50.55 g

55.55 g

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

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C₂H₅OH

C₆H₅OH

HCOOH

One mole of C₂H₅OH contains the number of H-atoms

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6.02 x 10²³

3.61 x 10²⁴

1.81 x 10²⁴

6.02 x 10²⁴

A molecular ion is formed by

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Passing a high energy electron beam through gaseous molecule

Dissolving a salt i dilute acid

Passing electric current through molten salt

Passing electricity through aqueous solutions

One mole of ethanol and one mole of ethane have an equal

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Mass

Number of atoms

Number of electrons

Number of molecules

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

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Maxewell

Newton

Sanger

John Dalton

A limiting reactant is one which according to the stoichiometric equation

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Has excess mass

Has least mass

Has excess number of moles

Has least number of moles

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84.84 %

89.89%

81.81%

90.90%

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

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3.01 x 10²³

1.5 x 10²³

6.02 x 10²⁴

3.01 x 10²⁴

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

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2.8 g

2.4 g

1.4 g

14 g

Covalent compound s mostly exist in the form of:

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Protons

Atoms

Neutrons

Molecules

Metal tend to lose electrons, becoming:

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Metals

Positively charged

Negatively charged

(a)And (c)

Which one of the following statements is not correct

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A molecule is the smallest particle of an element which can exist independently

He is a molecule of helium

S₈is a molecule of sulphur

O₃is a molecule of oxygen

Which statement about an atom is true ?

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The number of neutrons is not equal to number of electrons

Mass number is less than atomic number

All the elements have only one mass number

Mass number can be equal to atomic number

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

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1/12 mass of carbon-12

1/12 mass of carbon

1 mass of hydrogen atom

1/16 mass of oxygen

Macromolecules are

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organic molecules

High molecular mass molecules

Natural compounds

Rarely occurring molecules

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

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2.24 dm³

22.4 dm³

1.12 dm³

112 cm³

The percentage of H is the highest in

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CH₄

NH₃

H₂SO₄

C₆H₁₂O₆

Formation of a cation is:

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Exothermic process

Non-endothermic process

Endothermic process

None of above

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

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Cation

Molecule

Neutral atom

Anion

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300 cm³

200 cm³

150 cm³

100 cm³

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

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The percentage composition of the compound

The relative molecular mass of the compound

The density of the compound

The volume occupied by one mole of the compound

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

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C₃H₄O₃

C₂H₄O₃

C₃H₅O₄

C₂H₃O₁

A molecule of haemoglobin is made up if nearly

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10,000 atoms

50,000 atoms

2500 atoms

1500 atoms

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

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x-rays

Video camera

Telescope

Compound microscope

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