ASSESSMENT
A K Srivastava Chemistry Solutions for Exercise - ASSESSMENT
Simple step-by-step solutions to ASSESSMENT questions of Chemical Reactions and Equations from Science Chemistry. Also get 3D topic explainers, cheat sheets, and unlimited doubts solving on EMBIBE.
Questions from ASSESSMENT with Hints & Solutions
To prevent chips from getting oxidised, the bags of chips are flushed with
| Column A | Column B |
| (i) Reactants | (a) The substances that are formed as a result of chemical reaction. |
| (ii) Products | (b) The substances in which chemical change is brought. |
| (iii) Exothermic | (c) Reactions in which the products do not react to give back the reactants. |
| (iv) Endothermic | (d) Reactions which are accompanied with evolution of heat. |
| (v) Reversible | (e) Reactions which are accompanied with absorption of heat. |
| (vi) Irreversible | (f) Reactions which can take place in both the directions under similar conditions of temperature and pressure |
| (vii) Oxidation | (g) The process of addition of hydrogen or removal of oxygen |
| (viii) Reduction | (h) Reaction in which two or more substances combine to form a new single substance |
| (ix) Combination | (i) The process of addition of oxygen or removal of hydrogen. |
| (x) Decomposition | (j) Reaction in which one of the products formed is an insoluble substance and is thrown out of the solution as solid. |
| (xi) Displacement | (k) The conversion of a single compound into two or more simpler substances. |
| (xii) Precipitation | (l) Reaction in which an element displaces another element from its compound. |
| (xiii) Double displacement | (m) Reaction in which two reacting compounds exchange their corresponding ions and form two new compounds. |
| (xiv) Oxidising agent | (n) A substance which provides hydrogen or removes oxygen. |
| (xv) Reducing agent | (o) A substance which provides oxygen or removes hydrogen. |
Why should a magnesium ribbon be cleaned before being burnt in air?
Which type of reaction takes place when magnesium ribbon burns in the air? Why is it called so?
Why does the red litmus paper turn blue when touched with an aqueous solution of magnesium oxide?
Why is it suggested to wear dark coloured goggles while watching magnesium ribbon burning in the air?
What happens when magnesium oxide dissolves in water?
Solve the crossword puzzle. Hints are given below.
Across
6. The substance which takes part in a chemical reaction.
7. The substances that are formed as a result of a chemical reaction.
9. Double displacement are _____ in nature.
10. Only a single substance is formed as a result of _____ reaction.
11. A brown substance with the chemical formula .
12. Formation of nitric oxide from nitrogen and oxygen at is an example of _____ reaction.
14. Obtained on heating .
15. BHT is an _____.
Down
1. A chemical _____ is a symbolic representation of a chemical change.
2. Digestion of food in our body is an example of _____ reaction.
4. A process that involves the gain of oxygen or the loss of hydrogen.
5. A process that involves the gain of hydrogen or loss of oxygen.
8. The oxidation of fats and oils in food results in an unpleasant smell and taste.
13. A chemical equation that contains an equal number of atoms of each element on both sides of the equation.
