Advertisements
Advertisements
Question
Complete the table given below.
| Heat on iodine crystals | Colour of vapours evolved |
Solution
| Heat on iodine crystals | Colour of vapours evolved | Violet (I2 Iodine vapours) |
APPEARS IN
RELATED QUESTIONS
Fill in the blank:
The substances which undergo chemical change are called _______
Name the type of chemical reaction shown by the following equation:
2Mg + O2 → 2MgO
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Sodium chloride
State the original colour of the following substance and colour of residue obtained after heating.
Zinc carbonate
Distinguish by heating the following in dry test tubs.
Zinc nitrate and copper nitrate.
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium chloride
Represent the addition of dilute sulphuric acid to zinc by means of a chemical equation. State the function of the arrow between the reactants and products.
Select the correct answer for the following options:
The basic gas obtained when two gases react in presence of a catalyst and the reaction is exothermic.
Select the correct answer for the following options:
The gas which reacts with oxygen to give a neutral liquid.
Give reason for the following:
Even though rusting is an exothermic reaction, the heat evolved when an iron nail rusts is unnoticeable.
State the following reaction represent oxidation or reduction.
\[\ce{Cu++->Cu}\]
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to sodium sulphite.
Select the correct answer from the options given below:
State the gaseous product formed, when
An ammonium salt reacts with an alkali.
Explain the following statement: Digestion is a chemical change.
_____ is the basic material to manufacture urea.
________ is a chemical substance which alters the speed of a chemical reaction.
Write some materials prepared by chemical changes.
Classify the following processes into physical or chemical changes:
(i) Beating of aluminium metal to make aluminium foil.
(ii) Digestion of food.
(iii) Cutting of a log of wood into pieces.
(iv) Burning of crackers.
Which is used as a catalyst during the process of hydrogenation of oils?
How would you show that the settling of curd is a chemical change?
