The general formula of an alkyl halide (where X represents the halide) is?
See more
2014
An element X has electron configuration 1s2 2s2 2p6 3s2 3p5. Which of the following statements is correct about the element?
See more
2014
200 cm3 of a gas at 25oC exerts a pressure of 700 mmHg. Calculate its pressure if its volume increase 350 cm3 at 75oC.
See more
2014
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.
See more
2014
What is the percentage of sulphur in sulphur (IV) oxide?
See more
2014
A mixture is different from a compound because
See more
2014
A silicon -containing ore has 92% 28Si, 5% 29Si and 3% 30Si. Calculate the relative atomic mass of the silicon.
See more
2014
The radio active radiation used in studying the arrangement of particles in giant organic molecules is
See more
2014
How many protons, neutrons and electrons respectively are present in the element 60/27 Co?
See more
2014
If the difference in electronegativity of elements P and Q is 3.0. The bond that will be formed between them is
See more
2014
Beryllium and aluminium have similar properties because they
See more
2014
The dispersion of a liquid in a liquid medium will give
See more
2014
16.55g of lead (ll) trioxonitrate (V) was dissolved in 100g of distilled water at 20oC, calculate the solubility of the solute in moldm-3[Pb = 207, N = 14, O = 16]
See more
2014
On exposure to the atmosphere, a hydrated salt loses its water of crystallization to become anhydrous. This phenomenon is referred to as
See more
2014
Water is said to be temporarily hard when it contains
See more
2014
The nitrogen obtained from air has a density higher than the one from nitrogen-containing compounds because the one from air is contaminated with
See more
2014
Which of the following salts will turn blue litmus red?
See more
2014
The mathematical expression of PH is
See more
2014
The colour of litmus in a neutral medium is
See more
2014
The major and most effective way of controlling pollution is to