STEPS … A T CY Progr am
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BC–MSSC
CLASSIFICATION OF ELEMENTS
Time: 1 hour
Maximum Marks: 35
General instructions:
(i)
All the questions are compulsory.
(ii)
The question paper consists of 20 questions. Question number 1–11 are of 1 mark each, question
number 12–16 are of 2 marks each, question number 17–19 are of 3 marks each and question
number 20 is of 5 marks.
(iii)
Write down the serial number before attempting the question.
(iv)
Use of a calculator is not permitted.
SECTION – A
1.
Which property was used as a basis of classification of elements by Mendeleev?
2.
What does the Modern Periodic Law state?
3.
What do the gaps in the Mendeleev’s Periodic Table indicate?
4.
Is it possible to have an element between H and He in the periodic table?
5.
Which element out of the following is a metalloid?
Sodium, sulphur, silicon, phosphorous
6.
An element ‘X’ forms a chloride with the formula XCl2, which is a solid with a high melting point. The
element ‘X’ would most likely be in the same group as
(i) Na
(ii) Mg
(iii) Al
(iv) F
7.
Why are the elements like Na, Mg, Al, Si and P placed in the third period of periodic table?
8.
How many triads could Doberenier identify from the elements known at his time?
9.
What happens to the atomic radius of elements as you go from the left to the right in the periodic table?
10.
As we move down the group in the periodic table, why does the tendency to lose electrons increase?
11.
Why are the 18th group gases called noble gases?
SECTION – B
12.
Why there is a change in electropositive character of elements as we move:
(a)
13.
down the group in a periodic table?
(b)
along the period in a periodic table?
What is the nature of the oxides of the elements Na, K and Ca and C, S and P present on the left hand
and right hand side of the periodic table?
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STEPS … A T C Y P rogr am
_________________________________________________________________________________
BC–MSSC
14.
Which products are formed on reaction of sodium metal with water?
15.
What will happen if the carbonates of Alkaline earth metals are heated? Give one example.
16.
(a)
What property do all the elements have in common, in the same column of the Periodic Table, as
fluorine have?
(b)
What property do all the elements of the second period, from Li to Neon, have in common?
SECTION – C
17.
18.
19.
Number of electrons present in the third shell of an element ‘X’ is 3.
(a)
Name the element.
(b)
In which group of the periodic table the element is present?
(c)
Explain the nature of element ‘X’.
Are the following statements true? Justify your answer.
(a)
All groups contain metals and non-metals.
(b)
In group I reactivity decreases as the size of an atom increases.
(c)
Metallic character increases along a period with an increase in atomic number.
(a)
What is the total number of elements in the shortest and longest period of periodic table?
(b)
Why are Li, Na and K called Alkali metals?
(c)
What is the physical state of metals like Li, Na and K and non-metals like F, Cl and Br?
SECTION – D
20.
Compare and contrast the arrangement of elements in Mendeleev’s and the Modern Periodic Table.
2 STEPS____________________________________________________________
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