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CHEMISTRY [2 Mark Question Answer]

The Peiodic Table · ICSE STD 9 (ICSE - English Medium). 5 questions.

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[2 Mark Question Answer]

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5 questions · timed · auto-graded

Question 12 Marks
The elements A and B have electronic configuration 2, 8, 18, 2 and (2, 6) respectively.
(a) To which periods A and B belong?
(b) To which group A and B belong?
Answer
(a) A belong 4th period and B 2nd period
(b) A belong IIB , 12 group and B belong to VIA 16th Group
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Question 22 Marks
State two merits of Mendeleev’s periodic table over previous attempts of classification of the elements.
Answer
1. Mendeleev’s periodic law predicted the existence of certain elements such as gallium, scandium and germanium, which were not discovered at that time. 2. Mendeleev’s periodic table could also predict the properties of various elements based on their position in the periodic table
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Question 32 Marks
(a) What are the basis of classification of elements in Mendeleev’s periodic table?
(b) State Mendeleev’s periodic law.
Answer
(a) on the basis of their atomic mass and similarity in chemical properties.
(b) According to Mendeleev periodic physical and chemical properties of elements depend on their atomic weight
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Question 42 Marks
State two reasons for rejecting the law of octaves.
Answer
Limitation of law of octaves:

• The law was applicable to elements up to calcium only.
• There is no place for newly divorced elements.
• Cobalt and Nickel have different properties but put in one slot.
• Iron is a metal but put in non meta
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Question 52 Marks
(a) Name an alkali metal other than lithium, sodium and potassium.
(b) Name an alkaline earth metal other than calcium, strontium and barium
(c) Name one halogen other than chlorine, bromine and iodine
(d) Name a non metal having properties similar to carbon.
(e) Name a rare gas other than neon, krypton and xenon.
Answer
rubidium (Rb), cesium (Cs), and francium ( Fr )
beryllium (Be), magnesium (Mg), and radium (Ra)
fluorine (F), astatine (At), and tennessine (Ts).
Silicon.
Argon (Ar).
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[2 Mark Question Answer] - CHEMISTRY STD 9 Questions - Vidyadip