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CHEMISTRY [1 Mark Question Answer]

The Peiodic Table · ICSE STD 9 (ICSE - English Medium). 10 questions.

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[1 Mark Question Answer]

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Question 11 Mark
Which period is (a) shortest (b) longest in the long form of periodic table? How many elements are in (a) and (b)?
Answer
(a) shortest is 1st period having 2 elements(b) longest is 6th and 7th period having 32 element each
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Question 21 Mark
Name four elements of VIIA group. State the common name of this group of elements.
Answer
fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). common name of this group of elements is Halogen
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Question 31 Mark
Name four alkaline earth metals. To which group do they belong?
Answer
beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). They belong to 2A group
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Question 41 Mark
Name four alkali metals. To which group do they belong?
Answer
lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). They belong to 1A group
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Question 51 Mark
The elements A and B obey law of octaves. How many elements are between A and B?
Answer
There are a total of 6 elements in between elements A and B
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Question 61 Mark
State two achievements of the law of octaves.
Answer
the first logical attempt to classify elements on the basis of atomic weights. Periodicity of elements was recognized for the first time
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Question 71 Mark
Complete the statement given below:
Answer
On the basis of Newland’s law of classification of elements, the properties of sodium and potassium similar, because potassium is the . Eighth… element, starting from sodium.
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Question 81 Mark
What is the achievement of Dobereiner’s law of triads?
Answer
It gave an idea that elements with similar properties could be arranged in specific ways
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Question 91 Mark
From the list of elements given below, make three triads and name the family of each triad.
Cl, Li, Ca, Br, Na, St, 1, K and Ba.
Answer
(i) Alkali metals triad : Li Na K (ii)Alkaline earth metals triad : Ca Sr Ba (iii) Halogens triad : Cl Br
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Question 101 Mark
Why there was a necessity for classification of elements? Give at least two reasons.
Answer
It helps in the synthetic study of the properties of elements
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[1 Mark Question Answer] - CHEMISTRY STD 9 Questions - Vidyadip