MCQEasy1 mark
1
Choose the correct answers to the questions from the given options. (Do not copy the questions, write the correct answers only.)
The electronic configuration of an element is 2,8,2. The hydroxide of this element can produce ............... hydroxyl ions per molecule.
Topic: Mole concept, gas volumes and stoichiometry
Previous-year question practice database
Try it
Pick an option and check your answer. The full worked answer is below either way.
Answer
Exam answer
(b) 2 hydroxyl ions.
Explanation
The element is Mg; Mg(OH)₂ gives two OH⁻ ions.
In words
2 hydroxyl ions.
More from Mole Concept and Stoichiometry
What volume of carbon dioxide is produced at STP when 5 litres of propane is burnt completely according to the equation given below?
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O2026The relative molecular mass of a substance expressed in grams.2026The volume occupied by 8 grams of oxygen gas at STP is ............... litres. [5.6 / 8.96] [Atomic weight of O = 16]2026Equal volumes of ammonia gas and chlorine gas are kept in two different containers under the same conditions of temperature and pressure.
Find the number of molecules contained in chlorine gas when the mass of ammonia is 34 g.
[Atomic weight: Cl=35.5, H=1, N=14]2026The type of reaction that occurred is ............... . (addition / substitution)2026Name a suitable catalyst which is used in the reaction.2026