(1)
‘A’ is an element having four electrons in its outermost orbit. An allotrope ‘B’ of this element is used as a dry lubricant in machinery and in pencil leads. So
‘A’ is an element having four electrons in its outermost orbit. An allotrope ‘B’ of this element is used as a dry lubricant in machinery and in pencil leads. So
‘A’ is an element having four electrons in its outermost orbit. An allotrope ‘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.
Write the name of element ‘A’ and its allotropes.
(ii)
State whether ‘B’ is a good conductor or non-conductor of electricity.
State whether ‘B’ is a good conductor or non-conductor of electricity.
(2)
‘E’ is an element which reacts with oxygen to form an oxide E2O. An aqueous solution of E2O turns red litmus blue, so
‘E’ is an element which reacts with oxygen to form an oxide E2O. An aqueous solution of E2O turns red litmus blue, so
‘E’ is an element which reacts with oxygen to form an oxide E2O. An aqueous solution of E2O turns red litmus blue, so
(1)
What is the nature of oxide E2O?
What is the nature of oxide E2O?
(2)
Write the name of element ‘E’.
Write the name of element ‘E’.
Answers
Answer:
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Complete question:
A is an element having four electrons in its outermost orbit. An allotropes BB of this element is used as a dry lubricant in machinery and in pencil leads. So :
(a) Write the name of element A and its allotropes.
(b) State whether B is a good conductor or non-conductor of electricity?
&
E is an element which reacts with oxygen to form an oxide E₂O. an aqueous solution of E₂O turns red litmus blue, so:
(a) What is the nature of oxide E₂O?
(b) Write the name of element E.
Solution:
(a) The name of the element A is carbon and element B is graphite.
(b) Graphite is a very good conductor of electricity. Though graphite is a non-metal, it is a good conductor. It has 3 valence electron which forms covalent bond and when the electric current is passed through it the electron becomes delocalised.
&
(a) As the element is changes red litmus to blue, E is basic in nature.
(b) The name of the element is lithium. When it combines with oxygen it form Li₂O. It is a soft and white metal. It is a alkali metal. It is the lightest metal in periodic table.