Chemistry The two metal ions that cause hardness to water are: Calcium, Magnesium Sodium, Magnesium Sodium, Potassium Sodium, Calcium Calcium, Magnesium Sodium, Magnesium Sodium, Potassium Sodium, Calcium ANSWER DOWNLOAD EXAMIANS APP
Chemistry Which one of the following is a micro-element ? Nitrogen Oxygen Hydrogen Chlorine Nitrogen Oxygen Hydrogen Chlorine ANSWER DOWNLOAD EXAMIANS APP
Chemistry What are the number of moles of CO2 which contains 16 g of oxygen? 0.5 mole 0.25 mole 0.2 mole 0.4 mole 0.5 mole 0.25 mole 0.2 mole 0.4 mole ANSWER DOWNLOAD EXAMIANS APP
Chemistry The first metal used by a man was Silver Bronze Brass Copper Silver Bronze Brass Copper ANSWER DOWNLOAD EXAMIANS APP
Chemistry The organic reaction represented by equation CH3 - CH = O + H2NOH gives CH3 - CH - NH + H2O is an example of a condensation reaction an oxidation reaction an elimination reaction an addition reaction a condensation reaction an oxidation reaction an elimination reaction an addition reaction ANSWER DOWNLOAD EXAMIANS APP
Chemistry PH scale ranges from 0 – 7 0 – 14 None 8 – 14 0 – 7 0 – 14 None 8 – 14 ANSWER DOWNLOAD EXAMIANS APP
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