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CHEMISTRY 1-4

WRITE YOUR FULL STUDENT NAME

The mass of sodium hydroxide contained in 25 cm 3 of 0.1 M NaOH is

A 0.5 gm

B 2.85 gm

C 250 gm

E 25 gm

Among the factors that determine the ions to be discharged at electrodes when salt solutions are electrolysed are their

A non metallic nature

B relative concentrations in the solution

C relative ionic masses

D electronic configuration

E position in the periodic table.

Among the factors that determine the ions to be discharged at electrodes when salt solutions are electrolysed are their

A non metallic nature

B relative concentrations in the solution

C relative ionic masses

D electronic configuration

E position in the periodic table.

“Water is referred to as the universal solvent”. What does this mean?

A Water is neither acidic nor basic as compared to other liquids.

B Water exists in three states of matter than any other liquid

C Water dissolves both organic and inorganic solutes.

D Water is used more domestically than any other liquids

E Water dissolves more substances than any other known liquids

When methane undergoes substitutional reaction with excess chlorine, what is the final product?

A Chloromethane

B Dichloromethane

C Trichloromethane

D Tetrachloromethane

E Monochloromethane

Why is hydrogen gas collected over water and by upward delivery method?

A It is insoluble in water and less dense than air.

B It is soluble in water and denser than air

C It is insoluble in water and denser than air.

D It is soluble in water and less dense than air.

E It is soluble in both water and air.

Consider the following fuels which are used for different purposes: 1. Coal 2. Fire wood 3. Petrol 4. Charcoal. Which fuels originate from fossils?

A 1 and 3

B 1 and 3

C 2 and 4

D 2 and 3

E 1 and 2

The following are the uses of chromatography except

A to analyse blood in crime scenes.

B to detect different fibres.

C to detect water pollution

D to bleach dye/colour.

E to test the purity of organic substances.

What is the proper set of apparati that you would use to grind granules of a solid

A Pestle and filter funnel

B Separating funnel and mortar

C Pestle and filter paper

D Pestle and mortar

Oxygen gas can be produced at a large scale by

A condensation of air.

B condensation of liquefied air

C liquefaction of steam

D Fractional distillation of liquefied air.

E evaporation of liquefied air.

Which of the following sets of processes uses a gas that ignites with a “pop sound when a lighted splint is passed through it?

A Balloon filling, welding and diving

B Hardening oil, balloon filling and welding

C Hardening oil, balloon filling and diving

D Fueling rocket, diving and welding

E Balloon filling fueling rocket and diving

Which statement is the most correct about a chemistry laboratory?

A Is a special room designed for conducting chemical tests

B Is a special room designed for science practicals

C Is a special room designed for keeping apparatuses.

D Is a special room where data analysis is carried out

E Is a special room where students learn chemistry.

Which role does organic matter play in the soil?

A Improving water infiltration of the soil.

B Accelerating break down of organic matter

C Reserving nutrients thus providing soil fertility

D Converting nitrogen into nitrates.

E Providing a room for organic material such as nylons.

A current of 0.2 A was passed through an electrolyte for 16 minutes and 40 seconds. What is the quantity of electricity produced in coulombs?

A 200 C

B 1000 C

D 0.20 C

E 7686 C

Substance X liberates chlorine gas from acidified potassium chloride. The behaviour of X is described as

A an oxidising agent

B an oxidising and reducing agent

C catalyst

D a reducing agent

E bleaching agent.

Which carbonate is the most stable to heat?

A Calcium carbonate

B Copper (II) carbonate

C Lead (II) carbonate

D Zinc carbonate

E Iron (II) carbonate.

Aluminium does not react with water and does not corrode much in air because

A it is below hydrogen in the reactivity series

B it forms a stable carbonate which prevents reactions

C the metal is covered with a protective coating of an oxide

D aluminium ions have positive charges

E it is very stable

When a burning fuel produces blue colour it means there is

When a burning fuel produces blue colour it means there

B inadequate supply of oxygen without production of soot

C inadequate supply of oxygen with production of soot.

D adequate supply of oxygen with production of less heat

D adequate supply of oxygen with production of MORE heat

Which substance can be reduced when heated with carbon?

A Aluminium

B Calcium carbonate

D Magnesium oxide

E Sodium oxide.

Which one of the following does not involve the processes of urban water treatment and purification?

A Sedimentation

B Distillation.

C Filtration

D Chlorination.

Why hydrogen gas is not a constituent of air?

A Because of being water soluble

B Because of being denser than air

C Because of being very light

D Because of being highly flammable

Which is the suitable alternative heat source to be used in absence of Bunsen burner?

A Torch and spirit burner

B Torch and kerosene stove

C Kerosene stove and spirit burner

D Firewood and torch

What group and period does the element with 11 electrons belong?

A Group I and period 3.

B Group II and period 1.

C Group I and period 1.

D Group II and period 3

What happens when substance A reacts with substance B to form a new substance C?

A Substance A and B are said to have formed a solution.

B Substance A and B are said to have undergone a physical change.

C Substance A and B are said to have undergone a chemical change.

D Substance A and B are said to have undergone a dissolution.

Which components make the fire triangle?

A Oxygen, fuel and heat.

B Oxygen, nitrogen and heat

C Oxygen, fuel and carbon dioxide

D Oxygen, heat and hydrogen

Which net charge exists in radicals?

A Zero.

B Positive or negative

C Neutral

D Positive and negative

Why is a non-luminous flame is the most applicable flame for heating purposes?

A It is very noisy.

B It has no soot

C It is very hot.

D It has air holes open.

A Substance which absorbs water/moisture from the atmosphere and forms a solution is called:

A. Efflorescent

B. Amphoteric.

C. Hygroscopic.

D. Deliquescent.

The correct statement about metals is that:-

A. React with acids to give gases.

C. Have more than one valency

D. All have magnetism.

In Chemistry, experiments test:

Problems.

Hypotheses.

Observation.

Fractional distillation process of a mixture of water and ethanol is possible because

A water and ethanol have the same boiling point

B water has lower boiling point than ethanol

C ethanol has lower boiling point than water

D water and ethanol form partially immiscible liquid solution

E water and ethanol are immiscible liquids.

Which of the following substances represent a group of acidic oxides?

A Carbon dioxide, carbon monoxide and sulphur dioxide.

B Sulphur trioxide, nitrogen dioxide and nnitrogen monoxide

C Carbon dioxide, sulphur dioxide and dinitrogen oxide

D Sulphur trioxide, carbon dioxide and nitrogen dioxide

E Carbon monoxide, nitrogen oxide and sulphur dioxide.

The Brownian movement is taken to be the evidence of the:

A theory of association of water molecules

B theory of ionization of electrolytes

C theory of colloidal suspensions

D kinetic theory of behavior of substances

E Brownian theory.

One off the isotopes of an element X has an atomic number Z and a mass number A. What is the number of neutrons contained in the nucleus of the element X?

A Z

B A

C A + Z

D A – Z

E Z – A

_____________ is the general term used to explain a mixture of different metals.

A Alloy

B Allotrope

C Amphoteric

D Amorphous

E Isotope.

In the titration of a monoprotic acid with a solution of sodium hydroxide of known concentration, what quantities will be equal at the equivalence point?

A concentration of hydroxide solution and hydronium ions.

B number of moles of hydroxide ions added and number of moles of hydronium ion initially present.

C number of moles of hydroxide solution added and volume of acid solution initially present.

D number of moles of hydroxide ion added and the number of moles of monoprotic acid initially present

E volume of sodium hydroxide solution added and volume of acid solution initially present.

The charge of one mole of electrons is represented by the term

A one ampere

B one coulomb

C one volt

D one faraday

E one gram.

As water is added to an acid, the acid becomes

A more acidic and its pH goes down

B more acidic and its pH goes up

C less acidic and its pH goes up

D less acidic and its pH goes down

E neutral and its pH becomes 7

Three elements, X, Y and Z, are in the same period of the periodic table. The oxide of X is amphoteric, the oxide of Y is basic and the oxide of Z is acidic. Which of the following shows the elements arranged in order of increasing atomic number?

A X, Y, Z

B Y, Z, Y

C Z, X, Y

D Y, X, Z

E X, Z, Y

Which of the following compounds contains only two elements?

A Magnesium hydroxide

B Magnesium nitride

C Magnesium phosphate

D Magnesium sulphite

E Magnesium sulphate.

The reason why white anhydrous copper (II) sulphate turns blue when exposed in atmosphere is that it,

A reacts with carbon dioxide

B reacts with oxygen

C becomes dry.

D absorbs water vapour.

E decomposes.

If a stead current of 2 amperes was passed through an aqueous solution of iron (II) sulphate for 15 minutes, then the mass of iron deposited at the cathode will be

A 54 g

B 56 g.

C 0.54 g.

D 28 g.

E 0.52 g.

The only metal which does not react with dilute hydrochloric acid is

A Magnesium

B Aluminum

C Copper

D Zinc

E Sodium

Which of the following statement is true about water gas?

A It is poisonous.

B Contains hydrogen

C Is the same as biogas

D Contains hydrogen and nitrogen.

E Contains carbon monoxide and hydrogen.

Alcohols react with carboxylic acids to form a group of organic compounds called

A alkynes

B aldehydes

C ethers

D esters

E alkanols.

Separation of a mixture by fractional distillation is possible if the mixture constituents differ in their

Melting points

Boiling points

Freezing points

Vapouring points

Which of the following warning signs is likely to appear on the bottle containing concentrated Nitric acid in lab?

Corrosive

Explosive

Flammable

Irritant

A saturated solution is the one which

Will take no more of solute at a given temperature

Has large amount of solvent at given temperature

Contains a little solute at a given temperature

Contains more solute undissolved at a given temerature

Which of the following is not true about hydrogen?

It is lighter than air

It burns with a blue flame

It supports combustion

It is colorless

The process by which water is converted to vapor or steam is called______

Condensation

Evaporation

Precipitation

Transpiration

Heat is the same as flame

True

False

Ionization energy is the tendency of an atom to attract electrons to itself

True

False

Sodium reacts with cold water to form an alkali solution

True

False

Separation of a mixture by fractional distillation is possible if the mixture constituents differ in their

Melting points

Boiling points

Freezing points

Vapouring points

Which of the following warning signs is likely to appear on the bottle containing concentrated Nitric acid in lab?

Corrosive

Explosive

Flammable

Irritant

A saturated solution is the one which

Contains more solute undissolved at a given temerature

Contains a little solute at a given temperature

Has large amount of solvent at given temperature

Will take no more of solute at a given temperature

Which of the following is not true about hydrogen?

It is lighter than air

It burns with a blue flame

It supports combustion

It is colorless

The process by which water is converted to vapor or steam is called______

Condensation

Evaporation

Precipitation

Transpiration

Heat is the same as flame

True

False

You should induce vomiting if a person has swallowed kerosene

True

False

Ionization energy is the tendency of an atom to attract electrons to itself

True

False

Sodium reacts with cold water to form an alkali solution

True

False

Two immiscible liquids are easily separated using a_________

Condenser

Separating funnel

Fractionating column

Filter funnel

Is the simplest way to purify water at home

Boiling

Cooling

Filtering

Condensing

Which of the following is a renewable energy source?

Biomass

Coal

Wind

Diesel

Charcoal is made by a process called

Gaseous distillation of wood

Dry distillation of wood

Dry fractional distillation of wood

Complete burning of wood

Which of the following is a physical change?

Milk left on the counter turns sour

Fruits are fermented to produce wine

A forest fire burns trees

Common salt dissolves completely in water

Argon, neon and helium can react with other elements under natural conditions to form complex compounds

True

False

Charcoal is a natural source of heat

True

False

Urban water treatment involves screening, the removal of floating substances in water

True

False

Manganese(iv) oxide releases gas during the preparation of oxygen

True

False

Magnets can be used to separate iron fillings from sulphur powder

True

False

A metal that is usually in liquid form is

Mercury

Sulphur

Iron

Bromine

A mixture of salt and chalk in water can be separated by

Evaporation only

Decantation and filtration

Filtration and evaporation

Crystallization only

Which of the following is not a component of fire triangle?

Heat

Electricity

Fuel

Oxygen

A certain liquid dissolves copper(II) sulphate crystals to form a blue solution, this liquid is likely to be

Hydrochloric acid

Liquefied Oxygen

Water

Liquefied air

Milk is a mixture of water and fats, this type of mixture is called

Suspension

Emulsion

Precipitate

Solution

The chemical properties of an element usually depend on the

Arrangement of nucleons in an atom

Arrangement of electrons in an atom

Arrangement of neutrons in an atom

Arrangement of protons in an atom

Which of the following is a chemical change?

Magnetization of iron

Heating of a metal

Rusting of iron

Melting of ice

Air can be separated by a process called________to its constituents

Condensation

Simple distillation

Fractional distillation

Chromatographical separation

Which of the following is not a fossil fuel

Coal

Biodiesel

Natural gas

Petroleum

Which of the following is unlikely to produce soot?

A luminous flame

A candle

A tin lamp

A non-luminous flame

Corrosive substances are those that

Catch fire easily

Explore easily

Can burn the skin

Cause electric shocks

If K and Y are isotopes of the same element, then they have the same

Atomic number

Number of neutrons

Atomic weight

Mass number

The presence of the following is needed for rusting to take place

Iron, oil, air

Oxygen, moisture, iron

Iron, moisture, gas

Oxygen, iron, kerosene

Wind is a promising future energy source because

It doesn’t produce harmful gases that pollute the environment

There are no chemical reactions involved in harvesting wind power

It is renewable

It cannot be seen

P and Q are atoms of elements in the same period. P is in group l and Q is in group ll. Which of the following statements is not true of P and Q?

They have the same number of energy levels

The atomic number of Q is greater than that of P

Q has one more proton than P in its nucleus

P has one more electron than Q in its outermost shell

Matter is made up of tiny indivisible particles

True

False

Ammonia gas is an example of electrovalent bond

True

False

Producer gas produced by burning a solid carbonaceous fuel

True

False

Human beings and animals lose water to the air through transpiration

True

False

Haber process is used in the industrial manufacture of hydrogen

True

False

Nucleons are protons,neutrons and electrons

True

False

Ionization energy removes electrons from an atom or ion

True

False

Removal of hydrogen from a substance is a reduction process

True

False

Alkali earth metals include helium,neon and argon

True

False

Water is the universal solvent because it dissolves all solutes

True

False

You should induce vomiting if a person has swallowed an acid

True

False

Producer gas is a mixture of carbondioxide and nitrogen

True

False

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