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On recrystallization, 20g of magnesium tetraoxosuphate (IV) forms 41 g of magnesium tetraoxosulphate (IV) crystals, MgSO4. yH2O. The…

Which of the following gases is the most dangerous pollutant? A. Hydrogen sulphide B. Carbon (lV) oxide C.…

200 cm3 of air was passed over heated copper in a syringe several times to produce copper (II)…

If 30cm3 of oxygen diffuses through porous plug in 7s, how long will it take 60 cm3 of…

Oxygen is a mixture of two isotopes 16-O and 18-O with relative abundances of 90% and 10% respectively.…

Two elements, P and Q with atomic numbers 11 and 8 respectively , combine chemically to form the…

In the periodic table, what is the property that decreases along the periodic and increases down the group?…

The electron configuration of two elements with similar chemical properties are represented by? A. 1s22s22p5 and 1s22s22p4 B.…

The temperature of a body decreases when drops of liquid placed on it evaporate because? A. the atmospheric…

A mixture of 0.20 mole of Ar, 0.20 mole of N2 and 0.30 mole of He exerts a…