A mixture of petrol and water can be separated through?
A. centrifugation B. distillation C. the use of separating funnel D. the use of filter paper Correct Answer: Option C – the use of separating funnel
A metal X forms two bromides with the formulae XBr2 and XBr3. What type of bonding exists between X and bromine in the bromide?
A. Ionic bonding B. Metallic bonding C. Dative bonding D. Covalent bonding Correct Answer: Option A – Ionic bonding
The elements that belong to the third period of the periodic table are?
A. Li, Be, Al and P B. Na, P, O and Cl C. B, C, N and O D. Nz, Mg, S and Ar Correct Answer: Option C = B, C, N and O No element in period 3 has Nz as its symbol
Which of the following decrease when a given mass of gas is compressed to half its initial volume?
A. Atomic radius of each B. Average intermolecular distance C. Frequency of collisions D. Number of molecules presents Correct Answer: Option B – Average intermolecular distance
If the electron configuration of an element is p1s² 2s² 2P5; how many unpaired electrons are there?
A. 2 B. 8 C. 1 D. 4 Correct Answer: Option C – 1Products
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