200 cm3 of a gas at 25oC exerts a pressure of 700 mmHg. Calculate its…
200 cm3 of a gas at 25oC exerts a pressure of 700 mmHg. Calculate its pressure if its…
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An element X has electron configuration 1s2 2s2 2p6 3s2 3p5. Which of the following…
An element X has electron configuration 1s2 2s2 2p6 3s2 3p5. Which of the following statements is correct…
Beryllium and aluminium have similar properties because they
Beryllium and aluminium have similar properties because they A. are both metals B. belong to the same group…
What is the percentage of sulphur in sulphur (IV) oxide?
What is the percentage of sulphur in sulphur (IV) oxide? A. 66% B. 25% C. 40% D. 50%…
A gas X diffuses twice as fast as gas Y. if the relative molecular mass…
A gas X diffuses twice as fast as gas Y. if the relative molecular mass of X is…
At S. T. P how many litres of hydrogen can be obtained from the reaction…
At S. T. P how many litres of hydrogen can be obtained from the reaction of 500 cm3…
A mixture is different from a compound because
A mixture is different from a compound because A. the properties of a compound are those of its…
Which of the following electrodes is used in electrolysis of bauxite (Al2O3) in molten cryolite?
Which of the following electrodes is used in electrolysis of bauxite (Al2O3) in molten cryolite? A. Steel electrodes…
An aqueous solution of a metal salt, M, gives a white precipitate with NaOH which…
An aqueous solution of a metal salt, M, gives a white precipitate with NaOH which dissolves in excess…
A piece of sea shell, when dropped into a dilute solution of hydrochloric acid, produces…
A piece of sea shell, when dropped into a dilute solution of hydrochloric acid, produces a colourless, odourless…