UI Chemistry 2020/2021 Past Questions

The following are miscible with water except

The major raw material in a plastic industry is

Which of the following compounds is aromatic?

Which of the following statement is correct when hydrogen peroxide reacts with acidified potassium iodide solution.

Which of the following chemical reaction is not exothermic?

Select the equation representing, the action of steam on red hot iron.

Example of polymers include the following except

The component of air that is removed when air is bubbled into alkaline pyrogallol solution is

Which of the following substances is a peroxide?

An eruption polluted an environment with a gas suspected to he H₂, a poisonous gas. A rescue team should spray the environment with

1.34 of hydrated sodium tetraoxosulphate (VI) was heated to give an anhydrous salt weighing 0.71g. The formula of the hydrated salt is _______ [Na = 23, S = 32, O = 16, H = 1]

The ion that may be assumed to have neglible concentration in a sample of water that lathers readily with soap is_____

In which of the following are radioactive isotopes used?

Brass is an alloy containing copper and

The oxidation state of oxygen in tetraoxosuphate (iv)acid is

Rhombic sulphur, monoclinic sulphur and amorphous sulphur are:

Laughing gas is

The correct name of the Compound CH₃CH₂CONH₃ is

Nitrogen can best be obtained from a mixture of oxygen and nitrogen by passing the mixture over

At STP, how many litres of hydrogen can be obtained from the reaction of 500cm³ of 0.5M H₂SO₄ excess zinc metal

Tetraoxosulphate(VI) ions are final test using

The method that cannot be used for removing permanent hardness of water is ___.

The following are the half-lives of four active isotopes. Which one of the following is the most dangerous to handle?

The heat energy produced when the human body metabolizes 1 gram of fat is ___.

The luster of a metal is due to ___.