JAMB CHEMISTRY PAST QUESTIONS (UTME)

The situation obtained when a perfect gas expands into a vacuum is

Burning magnesium ribbon in air removes which of the following

(i) oxygen (ii) nitrogen (iii) argon and (iv) carbon(iv)oxide?

Calculate the percentage composition of oxygen in calcium trioxocarbonate(IV) [Ca=40, C=12, O=16]

Which of the following will give a precipitate with an aqueous solution of copper (I) chloride?

If the molecular mass of tetraoxosulphate (VI) acid is 98, calculate its vapour density.

A gas X diffuses twice as fast as gas Y. if the relative molecular mass of X is 32, calculate the relative molecular mass of Y.

Aluminium hydroxide is used in the dyeing industry as a

The elements in the periodic table are listed in order of increasing

The weakest attractive force that can be observed between two molecules is

A second alkanol can be oxidized to give an

The compounds CH₃CH₂CHO and CH₃COCH₃ can be distinguished from each other using

In electrovalency, the oxidation number of the participating metal is always

Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore,

Which of the following statements is true about 2-methylpropane and butane

The industrial preparation of hydrogen gas from water gas is referred to as

Which of the activities is commonly used as a nuclear fuel

Which of the following represents the kind of bonding present in ammonium chloride?

When large hydrocarbon molecules are heated at high temperature in the presence of a catalyst to give smaller molecules, the process is known as

The ideal gas laws and equations are true for all gases at

Which of the following metals burns with brick red

All these are electromagnetic waves except

Which of the following is the best starting material for the preparation of oxygen? Heating of trioxonitrate (v) with

The shape of the S-orbital is

Cathode rays cause an object placed behind a perforated anode to cast a shadow on the screen. This observation shows that the rays

A synthetic rubber is obtained from the polymerization of

Which of the following statements about catalyst is false?

The derivative of benzene that can be used in making explosives is

The reaction of halogens in the presence of sunlight is an example of

The periodic classification is an arrangement of the elements

Which of the following does not support the fact that air is a mixture?

The arrangement of particles in crystal lattices can be studied using

Atomicity of ozone is

A suitable reagent for distinguish between ethanoic and ethanol is

Which of the following statements is correct about the periodic table?Which of the following statements is correct about the periodic table?

The metal whose ore can be concentrated by passing it through a magnetic separator is

Which of these alloys contains copper?

An elements used in production of matches is

Calculate the amount in moles of silver deposited when 9650C of electricty is passed through a solution of silver salt [= 96500 Cmol^-1]

Ammonium chloride can be separated from its mixture with common salt by

There are basic particles from which matter called be made except

Which of the following statements is correct about the periodic table?

Which of the following metals cannot replace hydrogen from water or steam?

The process that occurs when two equivalent forms of a compound are in equilibrium is

200 cm³ of a gas at 25^oC exerts a pressure of 700 mmHg. Calculate its pressure if its volume increase 350 cm³ at 75^oC.

An oxidation state of or in K2CrO7

The number of electronic shells contained in an atom with electron configuration 1s²2s²2p⁶3s²3p⁶4s² is

In the production of soap, concentrated sodium chloride solution is added to

According to the Kinetic Theory an increase in temperature causes the kinetic energy of particles to

When ΔH is negative, a reaction is said to be

The oxidation number of iodine in KIO₃ is

Sieving is a technique used to separate mixtures containing solid particles of

The enzyme used in the hydrolysis of starch to dextrin and maltose is

The tincture of iodine means iodine dissolved in

To what temperature must a gas at 273k be heated in order to double both its volume and pressure?

A liquid that will dissolve fat is

A major source of oxide of oxygen is from the burning of

During the electrolysis of copper II sulphate between platinum electrodes, if litmus solution is added to the anode compartment

P1V1 = P2V2 supports ?

The shape of ammonia molecules is

Iron is often galvanized in order to