In the formation of electrovalent compounds, electrons are transferred from one element to another. How are electrons involved in the formation of a covalent compound?
Write a balanced equation for the following reaction:
Ammonium sulphate from ammonia and dilute sulphuric acid
In the formation of magnesium chloride (by the direct combination of magnesium and chlorine), name the substance that is oxidised and the substance that is reduced
Match the following:
| A. Acid salt | (i) Sodium potassium carbonate |
| B. Mixed salt | (ii) Alum |
| C. Complex salt | (iii) Sodium carbonate |
| D. Complex salt | (iv) Sodium zincate |
| E. Normal salt | (v) Sodium hydrogen carbonate |
Write a balanced equation for the following reaction:
Lead sulphate from lead nitrate solution and dilute sulphuric acid
Write a balanced equation for the following reaction:
Copper sulphate from copper and concentrated sulphuric acid
Write a balanced equation for the following reaction:
Lead chloride from lead nitrate solution and sodium chloride solution
From the list given below, select the word (s) required to correctly complete blanks (i) to (v) in the following passage:
Ammonia, ammonium, carbonate, carbon dioxide, hydrogen, hydronium, hydroxide precipitate, salt, water.
A solution X turns blue litmus red, so it must contain (i)………………ions another solution Y turns red litmus blue and therefore, must contain (ii) ……….. ions. When solution X and Y are mixed together, the products will be a (iii) ……….. and (iv)……… If a piece of magnesium were put into solution X, (v)…..gas would be evolved.
(Note: words chosen from the list are to be used only once.Write the answers as (a) (i),(ii),(iii) and so on. Do not copy the passage
The electronic configuration of nitrogen is 2,5 how many electrons in the outer shell of a nitrogen atom are not involved in the formation of nitrogen molecules?
