Exhaust fumes discharged from a smoky vehicle gradually become invisible as a result of?
A. diffusion B. combustion C. absorption D. emission Correct Answer: Option A – diffusion
One mole of a compound M(HCO3)2 has a mass of 162g. Calculate the relative atomic mass of M. [H = 1, C =12, O = 16]
A. 122 B. 101 C. 53 D. 40 Correct Answer: Option D – 40 Explanation One of the mole of M(HCO3)2 = 162g; M +(1 + 12 + 16 x 3) x 2 = 162; M +122 = 162,:. M = 162 – 122 = 40g
If an element with high electron affinity combines with another element with low ionization energy the bond formed will be mainly?
A. covalent B. ionic C. dative D. metallic Correct Answer: Option B – ionic
Which of the following compounds has the highest ionic character?
A. PCI5 B. SiCI4 C. AICI3 D. KCI Correct Answer: Option D – KCIProducts
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