Draw the well-labelled diagram of the human excretory system
Concept: Excretion: Substances to Be Eliminated
Explain sex determination in human beings.
Concept: Sex Determination in Humans
Give the structural formula of ethanol.
Concept: Properties of Ethanol
What are covalent compounds?
Concept: Bonding in Carbon - Covalent Bond
State the different types of neurons.
Concept: Human Nervous System
What is the peculiarity of the ‘DNA’ structure?
Concept: Genetics: Mendel’s Laws of Inheritance
What are vestigial organs?
Concept: Evidence of Evolution
Give the importance of variation in survival of species.
Concept: Sexual Reproduction in Animals
What is an alloy?
Concept: Concept of Corrosion of Metals and Its Prevention
Give two examples of alloys with their chemical composition.
Concept: Concept of Corrosion of Metals and Its Prevention
In the extraction of aluminium: Name the process of concentration of bauxite.
Concept: Occurrence of Metals > Extracting Metals Towards the Top of the Activity Series
‘E’ is an element which reacts with oxygen to form an oxide E2O. An aqueous solution of E2O turns red litmus blue, so:
i. What is the nature of oxide E2O ?
ii. Write the name of element ‘E’.
Concept: Chemical Properties of Metals: When Metals Are Burnt in Air
Answer the following question.
What are alloys?
Concept: Concept of Corrosion of Metals and Its Prevention
Write a balanced chemical equation for the action of heat on aluminium hydroxide.
Concept: Non Metals and Its Physical Properties
Write a balanced chemical equation for the action of heat on aluminium hydroxide.
Concept: Non Metals and Its Physical Properties
Write a balanced chemical equation for the action of heat on aluminium hydroxide.
Concept: Non Metals and Its Physical Properties
In the extraction of aluminium Write the cathode reaction in electrolytic reduction of alumina.
Concept: Occurrence of Metals > Extracting Metals Towards the Top of the Activity Series
In the extraction of aluminium: Write the function and formula of cryolite in the extraction of aluminium.
Concept: Occurrence of Metals > Extracting Metals Towards the Top of the Activity Series
Differentiate between Toilet soap and Laundry soap.
Concept: Soaps and Detergents
‘A’ is an element having four electrons in its outermost orbit. An allotropes ‘B’ of this element is used as a dry lubricant in machinery and in pencil leads. So:
i. Write the name of element ‘A’ and its allotropes.
ii. State whether ‘B’ is a good conductor or non-conductor of electricity?
Concept: Versatile Nature of Carbon > Saturated and Unsaturated Carbon Compounds
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