Advertisements
Advertisements
प्रश्न
Circle the odd one out. Give reason for your choice
विकल्प
Growth of a child
Blinking of eye
Rusting
Germination of a seed
Advertisements
उत्तर
Rusting
Reason: Rusting is undesirable change. Others three are desirable changes.
APPEARS IN
संबंधित प्रश्न
FILL IN THE BLANK
A .............. change is a temporary change.
TRUE \ FALSE
Positively charged electrode is called the anode. True or false ?
What are biocatalysts ?
Fill in the blank
A change in which the substance can be brought back to its original state is called a _______ change.
Fill in the blank:
In some chemical reactions an insoluble ________ is formed when two solutions are mixed.
Give an example of a reaction where the following are involved
Heat
Complete and balance the following reaction:
NaCl(aq) + AgNO3(aq) →
State the original colour of the following substance and colour of residue obtained after heating.
Ammonium dichromate
What do you observe when HCI is passed through a silver nitrate solution.
Give a chemical test to distinguish between the following gases.
CO2 and SO2
Select the correct answer for the following options:
The gas which reacts with oxygen to give a neutral liquid.
What is a chemical reaction?
Complete the table given below.
| Flame test for calcium chloride | Acid used for flame test |
Give a balanced equation for the conversion of a soluble lead salt to an insoluble lead salt – formed as a white precipitate.
Select the correct answer from the options given below:
State the gaseous product formed, when
An active metal reacts with dilute sulphuric acid.
Rusting of iron is ______.
______ occurs in the absence of air and in the presence of micro-organisms such as yeast.
The chemical formula of rust is ______.
Magnesium + oxygen → magnesium oxide.
2Mg + O2 → 2Mg O
Both CO2 and H2 gases are ______.
