Test Details

Classification Of Elements And Period

STUDY POINT CBSE ICSE

Nov 19, 6:35 PM

60 minutes

Nov 20, 7:00 PM

15.0 marks

MCQ

15 questions

STUDY POINT CBSE ICSE

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Class Details

Chemistry

Class Xi

Chemistry

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Question Text

Question 3 :
The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. The mass of Y is approximately equal to the average mass of X and Z. Such an arrangement of elements called as :

Question 4 :
According to Mendeleev's periodic law, the properties of elements are a periodic function of:

Question 5 :
The elements having more masses were placed before elements having lower masses in Mendleev's periodic table. Guess the pair of elements (higher mass, lower mass).

Question 6 :
If the two members of a Dobereiner triad are phosphorus and antimony, the third member of this triad is :

Question 8 :
The groups from $1^{st}$ to $7^{th}$ of Mendeleev's periodic table were divided into ______ subgroups.

Question 9 :
In Mendeleev's periodic table few elements that are chemically similar are placed in the same groups.

Question 10 :
The eight group of Mendeleev's periodic table is divided into how many subgroups?

Question 11 :
Assertion: The placement of isotopes in Mendeleev's periodic table overcome in the modern periodic table. Reason: In modern periodic table, the elements have been allotted places based on their atomic numbers

Question 12 :
Two elements were elected by Mendeleev for studying the properties of compounds formed by other elements with the selected elements. What were the selected elements?

Question 13 :
In Doberenier triads, the atomic weights of the elements in a triad are in increasing order.

Question 15 :
Statement: In Dobernier classification of elements, the atomic weight of the middle element is equal to the average of the extreme elements of a triad. State whether the given statement is true or false.

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