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Write the molecular formulae of all the compounds that can be formed by the combination of following ions Cu²⁺, Na⁺, Fe³⁺, Cl^– SO₄^-2, PO₄^-3

Answer: The molecular formula is the expression of the number of atoms of each element in one molecule of a compound. The molecular formula... View Article

Write the molecular formulae for the following compounds (a) Copper (II) bromide (b) Aluminium (III) nitrate (c) Calcium (II) phosphate (d) Iron (III) sulphide (e) Mercury (II) chloride (f) Magnesium (II) acetate

Answer: The molecular formula is the expression of the number of atoms of each element in one molecule of a compound. The molecular formula... View Article

Which of the following represents a correct chemical formula? Name it. (a) CaCl (b) BiPO₄ (c) NaSO₄ (d) NaS

Answer: (b) BiPO4 The correct formula is BiPO4 and the name is bismuth phosphate. Bismuth phosphate (BiPO4) is a correct chemical formula since... View Article

A change in the physical state can be brought about (a) only when energy is given to the system (b) only when energy is taken out from the system (c) when energy is either given to or taken out from the system (d) without any energy change

Answer: (c) when energy is either given to or taken out from the system When the system is supplied with energy, the solid-state transforms into... View Article

3.42 g of sucrose are dissolved in 18g of water in a beaker. The number of oxygen atoms in the solution are (a) 6.68 × 10²³ (b) 6.09 × 10²² (c) 6.022 × 10²³ (d) 6.022 × 10²¹

Answer: (a) 6.68 × 1023 Carbon = 12 Hydrogen = 1 Oxygen = 16 C = 12 × 12 = 144H = 1 × 22 = 22O = 16 × 11 = 176 Sucrose... View Article

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