MEDIUM
8th West Bengal Board
IMPORTANT
Earn 100

Draw the simple structures of hydrogen sulphide and carbon tetrachloride molecules (Valency of carbon and sulphur are 4 and 2 respectively; H and Cl are monovalent)

Important Questions on Sample Questions

MEDIUM
8th West Bengal Board
IMPORTANT
Environment and Science Class 8>Chapter 12 - Sample Questions>Sample Questions>Q 5
Which will be used as cathode and anode while electroplating zinc on an iron pipe?
MEDIUM
8th West Bengal Board
IMPORTANT
Environment and Science Class 8>Chapter 12 - Sample Questions>Sample Questions>Q 5
Mention two important industrial uses of Carbon dioxide.
EASY
8th West Bengal Board
IMPORTANT
Environment and Science Class 8>Chapter 12 - Sample Questions>Sample Questions>Q 5
Give example of one natural biodegradable polymer and another synthetic non-biodegradable polymer.
EASY
8th West Bengal Board
IMPORTANT
Environment and Science Class 8>Chapter 12 - Sample Questions>Sample Questions>Q 5
What is the principal component of biogas produced by the action of microbes on organic wastes?
EASY
8th West Bengal Board
IMPORTANT
Environment and Science Class 8>Chapter 12 - Sample Questions>Sample Questions>Q 5
Which one of the elements — O, P, S, C is essential for the formation of organic compounds?
EASY
8th West Bengal Board
IMPORTANT
Environment and Science Class 8>Chapter 12 - Sample Questions>Sample Questions>Q 5
Write names of three non-conventional sources of energy.
EASY
8th West Bengal Board
IMPORTANT
Environment and Science Class 8>Chapter 12 - Sample Questions>Sample Questions>Q 5
Write formula of Zinc phosphate, Calcium nitrate, ferric sulphate and mercurous nitrate.
MEDIUM
8th West Bengal Board
IMPORTANT
Environment and Science Class 8>Chapter 12 - Sample Questions>Sample Questions>Q 5
Write symbols of one metal and one non-metal, compounds of which can cause toxicity in human body.