MEDIUM
6th West Bengal Board
IMPORTANT
Earn 100

write valency for the given elements.
Element
Symbol
Valency
Oxygen
Nitrogen
Carbon
Sulphur
Chlorine
Fluorine
Iodine

Important Questions on Element, Compound and Mixture
MEDIUM
6th West Bengal Board
IMPORTANT
Solution | Solute | Solvent |
Syrup of sugar | ||
Salt solution |

MEDIUM
6th West Bengal Board
IMPORTANT
Examples of some known solutions are given below. Discuss among yourselves and write the name of the compounds of such solutions.
Solutions | Components |
Salt solution | |
Sugar solution | |
Lime water | |
Air |

HARD
6th West Bengal Board
IMPORTANT
Take a little muddy water. Fold a circular filter paper into four folds as shown in the picture. Open one fold and put the cone-shaped paper in a funnel, use a few drops of water to set it properly. Then pour muddy water slowly with the help of a glass rod on the filter paper.
Write in the following table what you see after a few minutes:
What you see | Why do you think it happens? |

HARD
6th West Bengal Board
IMPORTANT
Which solution | Size of a solid particle, smaller or greater than that of the pores of the filter paper | Which process- simple distillation or filtration - can be used for separation |
Muddy water | ||
Saline water |

HARD
6th West Bengal Board
IMPORTANT
Take a mixture of salt and iron powder on a sheet of paper. Take out of the magnet from the back of a damaged speaker of a radio. Then hold a magnet near it and see what happens.
What you see | Where else can you use it? |
