WTS-10S-II-5 Weekend Test Series
PERIODIC CLASSIFICATION OF ELEMENTS
Time: 45 minutes
Class - X
Maximum Marks: 33
General instructions:
(i)
All the questions are compulsory.
(ii)
The question paper consists of four sections A, B, C and D. Questions in sections A, B, C
and D carry 1, 2, 3 and 5 marks respectively.
(iii)
Write down the serial number before attempting the questions.
(iv)
Use of calculator is not permitted.
SECTION – A
1.
Upto which element was the Newland’s law of octaves found to be applicable?
2.
The elements were arranged in which order in the periodic table, according to Mendeleev's periodic
3.
In Mendeleev’s Periodic Table, gaps were left for the elements to be discovered later. Name one
law?
element which found a place later in the periodic table.
4.
Which of the given elements A, B, C, D and E with their atomic numbers 2, 3, 7, 10 and 30 respectively,
belong to the same period?
5.
Which of the given elements A, B, C, D and E with atomic numbers 9, 11, 17, 12 and 13 respectively
belong to the same group?
6.
Arrange the following elements in the order of their decreasing metallic character:
Na, Si, Cl, Mg, Al
7.
What type of oxide would Eka– aluminium form according to Mendeleev?
8.
What would be the correct increasing order of the atomic radii of elements O, F and N?
9.
Elements B, Si and Ge are__________.
SECTION – B
10.
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. What is such an arrangement of
elements called as? Give one example of such a set of elements.
11.
In Mendeleev’s Periodic Table, cobalt having atomic mass 58.93 amu was placed before nickel having
an atomic mass 58.71 amu. Give reason.
12.
“Hydrogen occupies a unique position in Modern Periodic Table’’. Justify the statement with examples.
13.
Which group of elements could be placed in Mendeleev's Periodic Table without disturbing the original
order? Give reason.
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WTS-10S-II-5 SECTION – C
14.
Identify the elements with the following properties and arrange them in increasing order of their
reactivity.
15.
(a)
An element which is a soft and reactive metal.
(b)
The metal which is an important constituent of limestone.
(c)
The metal which exists in liquid state at room temperature.
An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent
halide.
(a)
Where in the periodic table are elements X and Y placed? And also name them.
(b)
Classify X and Y as metal(s), non-metal(s) or metalloid(s).
(c)
What will be the nature of the oxide of element Y?
Identify the nature of bonding in the compound formed and illustrate it with a general structure.
SECTION – D
16.
An element placed in 2nd group and 3rd period of the Periodic Table burns in the presence of oxygen to
form a basic oxide.
17.
(a)
Identify the element.
(b)
Write its electronic configuration.
(c)
Write the balanced equation when it burns in the presence of air.
(d)
Write a balanced equation when this oxide is dissolved in water.
(e)
Draw the electron dot structure for the formation of this oxide.
An element X which is a yellow solid at room temperature shows property of catenation and allotropy. X
forms two oxides, which are also formed during the thermal decomposition of ferrous sulphate crystals
and are the major air pollutants.
(a)
Identify the element X.
(b)
Write the electronic configuration of X.
(c)
Write the balanced chemical equation for the thermal decomposition of ferrous sulphate crystals.
(d)
What would be the nature (acidic/ basic) of the oxides formed?
(e)
Locate the position of the element in the Modern Periodic Table.
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