When pollen grains are suspended in water and viewed under microscope, they appear to be in a state of constant motion. This is due to

The atomic mass of an atom is the mass of

The number of valence electrons of an element with atomic number 10 is:

The type of bond between two atoms of an element with atomic number 7 is:

In the periodic table, the elements that are chemically unreactive are:

The correct order of increasing oxidizing power of the following halogens is:

The pressure exerted by 100 cm³ of oxygen gas at 35 °C is 750 mmHg. What will be the volume of the gas if the pressure is increased to 10,000,000 mmHg at constant temperature?

If the rate of diffusion of oxygen gas is 1, what will be the rate of diffusion of methane under the same condition? [CH₄=16 O= 16)

To what temperature in kelvin must a gas be raised from 273 K in order to double both its volume and pressure?

The basicity of tetraoxophosphate (V) acid is

A concentrated acid that decomposes to give a reddish-brown gas is:

A salt derived from a strong base and a weak acid will undergo hydrolysis to give a solution that is

The salt that is prepared by neutralisation reaction is

What volume of carbon (IV) oxide in dm measured at s.t.p is liberated when 36 g of sodium trioxocarbonate (IV) is dissolved in hydrochloric acid? [Na=23, C=12 C=12, O=16, 1 mole of gas occupies 22.4dm3 at s.t.p.]

If 14.8 g of a salt is dissolved in 250 cm³ of distilled water to produce a solution with a concentration of 0.80 mol/dm³, calculate the molar mass of the salt in g mol⁻¹.

An ion that is present in acidified water is

Endothermic reaction occurs when

Which of the following does not alter the rate of chemical reaction?

What is the IUPAC name of the compound below?

According to the kinetic theory, molecular motion is high at

Zn(OH)Cl is a salt that is

The number of replaceable hydrogen ions in one molecule of an acid is called

The compound that will form solution when exposed to air is

In the electrolysis of brine, the anode is

In fractional distillation of crude oil, the following are obtained except

When the concentration of an electrolyte decreases, the conductivity

In an endothermic reaction, more products will be formed at/by

Calculate ΔS in JK⁻¹ mol⁻¹ for the conversion of one mole of water to vapour at 100 °C, given that the heat of vaporisation of water is 2260.8 Jg⁻¹. [molar mass of H₂O = 18].

A measure of the degree of disorderliness in a chemical system is

What is the product of the reaction be- tween ethanol and acidified KMnO₄ solution?

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

Which of the following is not a career in chemistry?

Sulphur (IV) oxide bleaches by

The electrical conductivity of graphite is due to its

The following are uses of acid except

Numerical coefficients in a balanced equation is the

Alkanoates are produced from alkanols by the process of

The bond that exists in ammonium ion is called

The general molecular formula of alkanol is

Nitrogen is prepared on a large scale by

In the periodic table, elements that lose electrons most easily belong to group

Which method of separation does the diagram below illustrates?

In the conductance of aqueous potassium tetraoxosulphate (VI) solution, the current carriers are

Convert 103 °C to temperature in Kelvin

Chemical industries require the following except

Calculate the molar mass in gmol⁻¹ of sodium trioxocarbonate (IV). [Na = 23, C = 12, O = 16]

Iron is paramagnetic because

The rekindling of a glowing splint by an odourless gas indicates the presence of

What is the value of X in the equation? Cr₂O₇²⁻ + 14H⁺ + Xe⁻ → 2Cr³⁺ + 7H₂O

Which of the following molecules has the lowest electronegativity?

What is the oxidation number of chromium in K₂C₂O₄?

When 20 cm³ of a saturated NaCl solution at 25 °C was evaporated to dry- ness, 5g of the dry salt was obtained. What is the solubility of NaCl at 25°C? [Na = 23, Cl = 35.5]

A metallic ion X²⁺ with an inert gas structure contains 18 electrons. How many protons are there in the ion?