Given that the electronic configuration of an element X is 1s22s22p63s 23p4, it can be…
Given that the electronic configuration of an element X is 1s22s22p63s 23p4, it can be deduced that X…
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P,Q,R and S are metals in the same group in the Periodic Table but in…
P,Q,R and S are metals in the same group in the Periodic Table but in periods 3,4, 5…
Allotropes of an element differ in their
Allotropes of an element differ in their A. physical properties B. chemical properties C. mass numbers D. electronic…
What is the mass number of an element if its atom contains 10 protons, 10…
What is the mass number of an element if its atom contains 10 protons, 10 electrons and 12…
A plastic which cannot be softened by heat is described as
A plastic which cannot be softened by heat is described as A. thermosetting B. non-biodegradable C. thermoplastic D.…
If 20 cm3 of distilled water is added to 80 cm3 of 0.50 mol dm-3…
If 20 cm3 of distilled water is added to 80 cm3 of 0.50 mol dm-3 hydrochloric acid, the…
Two-organic substances are labelled K and L if K gave a blue-black colour with iodine…
Two-organic substances are labelled K and L if K gave a blue-black colour with iodine solution and L…
A colourless, odourless liquid T, gives effervesce with sodium trioxocarbonate (IV) and a white precipitate…
A colourless, odourless liquid T, gives effervesce with sodium trioxocarbonate (IV) and a white precipitate with silver trioxonitrate…
When sodium hydroxide solution is added to a solution of zinc salt, the white precipitate…
When sodium hydroxide solution is added to a solution of zinc salt, the white precipitate fromed redissolves in…
Which of the following on burning in air contributes to acid rain?
Which of the following on burning in air contributes to acid rain? A. Sulphur B. Magnesium C. Aluminium…