2013 Chemistry Neco Objective Questions

The following are properties of electrovalent compounds EXECPT that they

The components of  universal indicator solution can be separated by

A mixture of two immiscible liquids can be separated by

Which of the following is not an evidence for the particulate nature of matter

How many atoms are contained in 2g of hydrogen gas?

(H=1, N_A =6.02×10²³ )

Which orbital has a spherical sondhape ?

The bonds present in ammonium ion is/are

How many electrons are in the outermost shell of a chlorine atom?

In the periodic table, alkaline earth metals are found in Group

The orbital above shows the electronic configuration of a/an

which of the following properties decreases across the period?

The percentage of oxygen in calciumtrioxocarbonate(iv) (CaCO₃) is (Ca =40, C =12, O =16)

From xNH_3(g)+ yO_2(g) →zNO_(g)+3H_2(g)  the value of x,y  and z respectively are

Which of the following is NOT a property of an acid?

A soluble base is called

A salt without its water of crystallization is said to be

Which of the following pH values indicates a basic Solution

If 25.00cm³ of 0.1moldm^-3  sodium hydroxide  neutralizes 21.00 cm³of hydrochloric acid, the concentration of the acid in moldm^-3 is

Calculate the volume of gas in dm³ used up when 0.5 of it is involved in a reaction. (1 mole of a gas occupies 22.4 dm³ at STP)

Calculate the mass in gram of anhydrous sodiumtrioxocarbonate (IV) in 500cm³ of 0.1 moldm^-3  of the solution (Na=23, C=12, O=16)

Calculate the volume of gas in dm³ used up when 0.5 of it is involved in a reaction. (1 mole of a gas occupies 22.4 dm³ at STP)

When aqueous ammonium is added to one of the  following solution, a white precipitate which dissolved in excess ammonia is formed.  The solution is

Which of the following compounds will NOT when strongly heated?

Which of the following is a condition for a  spontaneous reaction?

reaction above is

How many faradays will be required to literate 1mole of aluminum ion from the solution during electrolysis?

The following occur during electrolysis, EXCEPT

The arrangement of two different metals in aqueous solution of their salts to produce an electric current is

Calculate the rate of reaction in gmin ^-1 when 0.5gOf calcium trioxocarbonate(IV) was added to excess dilute hydrochloric acid for five minutes and carbon(IV) oxide was evolved

In the equation ,S represent the

Which of the following does NOT affect the rate of a chemical reaction?

Equilibrium is said to be attained in a reversible reaction when

An example of a disaccharide is

Ethene and ethyne can be distinguished from each other by bubbling each into

The name of the compound is

What is the molecular formula of a compound whose empirical formula is CH₂ O and molar mass is 180? (H=1, C=12, 0=16)

Which of the following involves decomposition of sugar by action enzymes?

Which of the following carbohydrate does NOT usually occur in the crystalline form?

An alkene can be converted to an alkane by

The alkanol with the formula  (CH₃)₃ COH is said to be

Which of the following compounds is a member5 of the series with the general molecular formula   C_nH_2n-2 ?

Which of theses compounds will react with NaOH to form a salt?

Chlorine is used in water treatment as a/an

Which of the following HCO₃^– or SO₄^{2 –} cause hardness of water?

Hydrogen is used for the following EXCEPT

Producer gas is a mixture for the

which of the following is not air pollutant?

The following can be obtained directly from the destructive distillation of coal, EXCEPT

A method that cannot be used to prevent rusting is

Bronze is an alloy of copper and

The following are properties of transition melting EXCEPT

Clay is the major raw material for production of

The major raw material in a plastic industry is

Which of the following is NOT a detector of radio active emission?

Changes in the physical states of substance M is illustrated below:

The phase order w, v and u represent

The equation above illustrates

The planet that is NOT among the solar system is

The ideal gas equation can be represented by

The pressure exerted by a gas is as a result of the

The theory that electrons in an atom revolve round the nucleus was postulated by

Define oxidation?

Clssify the following substance as oxidizing or reducing agent.

– Trioxonitrate (V) acid

– Tetraoxosulphate (VI) acid

– Chlorine

Carbon (II) oxide

(b)  i.      Define allotropy

1. name TWO crystalline forms of sulphur

iii.      Give TWO uses of sulphur

(c)  i.      Give the percentage composition of the following constituents of air.

–    Oxygen

–    Nitrogen

–    Carbon (IV) oxide

–    Rare gases

ii. Give the product formed by chlorine water exposed to sunlight

iii.      Write a balance chemical equation for the reaction between chlorine and water

iv. State TWO  uses of chlorine

v. Give FOUR  products of fractional distillation of crude oil.

(a)   i.     Define the term hard water.

1. Mention the types of hard water

iii.   Name ONE substance each that causes the hardness of water in 2a(ii).

1. Give ONE method each for softening each type of the hardness in  2a(ii)

(b)  i.    Name the THREE radioactive emissions.

1. State ONE difference between nuclear fusion

(c)   i.  Write the structural formula of:

–    2,3,4 – trimethylpentane

–   2 – bromo-3-methylpentan-1-ol

Trans 2, 3-dichlorobut-2-ene

ii.           Write a chemical equation that illustrates the oxidation of:

(i) A secondary

(ii) A primary alkanol

State One physical property of:

(i) Diamond

(ii) Graphite

d. i. Define an oxidizing agent?

ii. Give ONE example of an oxidizing agent

(a)   i.     State THREE factors that affect selective discharge

of ions in solution during electrolysis

1. State THREE uses of electrolysis

iii.    Calculate the mass of silver deposited when a current 2.6 amperes is passed through a solution of silver for 20 minutes.  (Ag = 108; IF = 96500C)

(b)  i.    List TWO conditions required for rusting to take place.

1. Mention TWO  differences between rusting and burning

(c)  i.     Define covalent bond.

1. Give THREE  properties of covalent compounds

iii.     Mention the type of bond that exists in compound NH₄Cl

(a)  i.    State TWO  differences between chemical reaction and nuclear reactions.

1. Explain the term esterification, using chemical equations only

iii.    Define activation energy

(b)        Use the information in the below to answer questions i – iv.

Which of the atom(S)

1. are isotopes of the same elements?
2. Contains 18 neutrons?

• Is chemically unreactive?

1. Forms ionic bond with C?
2. Belongs to S-block in the periodic table?

(c)  i.      What does each symbol represent in the expression below?

Give ONE ore of the following metals

–   Aluminum

–   Iron

iii.        For each of the ores named in d(ii) above, list the method of extraction.

1. 50cm³ of hydrogen is sparked with 20cm³  of oxygen at 100^oC and 1 atmosphere. What is the total volume of the residual gases?

(a)i.    State the role each of the following substances in the treatment of water for town supply.

1. – Chlorine

–  Alum

–  Sand-Bed

(b) i. Give three major uses of H₂SO₄

1. Explain the following observation: A strip of blue litmus paper dropped into concentrated H₂SO₄ becomes charred whereas in dilute H₂SO₄ it turns red and is not charred

iii.    Write an equation to show the reaction of conc. H₂SO₄ with zinc

(c)     N_2(g)  +  3H_2(g)    2NH_3(g)                                H = – ve

Using the expression above;

1. Name the type of reaction involved
2. What condition will favour the forward reaction?

iii.   Mention the catalyst used

1. Write the expression for equilibrium constant (Kc) of the reaction.

(d)  i.      State the first law of thermodynamics

1. Define the valency of an element

iii.     Calculate the mass of trioxonitrate (V) acid present in 50cm₃ of 0.5 moldm ^{– 3}  of the solution

(a)  i.      Classify the following as organic or inorganic acid: trioxonitrate (V) acid,     trioxocarbonate (IV) acid   ethanedioic acid   amino acid

ii. Give TWO properties of acids

iii.      Mention THREE types of salt and one example of each.

(b)i.      Define hygroscopy

5. 5.74g of hydrated copper (II) tetraoxososulphate  (VI) salt were heated of a constant mass of 3.25g. Calculate the water of crystallization of the salt. [Cu = 64, S = 32,  O = 16,  H = 1]

iii.       Define the entropy of a system

What will be the state of the reaction when  of a reaction is

i. Positive?

ii. Negative?

iii. Zero?