NTSE SAT Chemistry - Periodic Classification of Elements
Exam Duration: 45 Mins Total Questions : 30
Which of the following is a noble gas?
- (a)
Radon
- (b)
Radium
- (c)
Plutonium
- (d)
Rhodium
The number of elements in 3rd and 4th period respectively are
- (a)
8 and 18
- (b)
8 and 8
- (c)
8 and 32
- (d)
18 and 18
The total number of electrons that can be accommodated N shell is
- (a)
8
- (b)
18
- (c)
32
- (d)
50
The most reactive metal amongst the following
- (a)
Mg
- (b)
Ca
- (c)
K
- (d)
Cu
Which amongst the following is the most electro-negative element?
- (a)
Cs
- (b)
F
- (c)
Xe
- (d)
Li
According to Newlands' law of octaves 3rd element will resemble in its properties to-
- (a)
ninth element
- (b)
eight element
- (c)
tenth element
- (d)
eleventh element
On moving left to fight in a period, in the periodic table, metallic character
- (a)
decrease
- (b)
increases
- (c)
remains same
- (d)
first increase, then decreases
Which of the following properties of elements is a whole number?
- (a)
Atomic weight
- (b)
Atomic radius
- (c)
Atomic number
- (d)
Atomic volume
Which one of the following triads is an example of transition elements?
- (a)
Li, Na, K
- (b)
Ca, Sr, Ba
- (c)
Fe, Co, Ni
- (d)
F, Cl, Br
Which one is the most electronegative of all the elements?
- (a)
Cl
- (b)
O
- (c)
F
- (d)
N
Which one of the following elements has the smallest atomic radius
- (a)
Aluminium
- (b)
Magnesium
- (c)
Phosphorus
- (d)
Sulphur.
The size of the iodine species follow the order
- (a)
I+ < I < I-
- (b)
I+ < I- < I
- (c)
I+ < I- < I
- (d)
I < I- < I+
In Lothar Meyer's curve, the peaks are occupied by
- (a)
alkali metals
- (b)
halogens
- (c)
alkaline earth metals
- (d)
inert gases
Which of the following electronic configurations represents a metal?
- (a)
1
- (b)
2,8
- (c)
2,8,7
- (d)
2,8,8,2
In the I group elements, the atomic size varies as
- (a)
Li > Na > K > Rb > Cs
- (b)
Na > Li > K > Cs > Rb
- (c)
K > Na > Li > Rb > Cs
- (d)
none of the above
The valency of inert gases is :
- (a)
0
- (b)
1
- (c)
3
- (d)
2
The attraction that an atom exerts on a pair of electrons that are being shared with another atom for forming covalent bond is referred to as its :
- (a)
electron affinity
- (b)
electronegativity
- (c)
ionisatlon energy
- (d)
valency
Law of octaves was enunciated by
- (a)
J.W Dobereiner
- (b)
JAR Newlands
- (c)
Lothar Meyer
- (d)
D.I. Mendeleeff
An element X is placed in group IA of the periodic table because it forms
- (a)
an oxide which is acid
- (b)
a volatile chloride having formula XCl2
- (c)
an ionic chloride having formula XCl
- (d)
an insoluble chloride XCl4
The first transitional element in the periodic table is
- (a)
Sc
- (b)
Ni
- (c)
Fe
- (d)
Cu
The most abundant element in the earth's crust is
- (a)
Sl
- (b)
C
- (c)
O
- (d)
Ca
The element which have low values of ionisation potential are strong
- (a)
oxidising agents
- (b)
reducing agents
- (c)
oxidising or reducing agents depending upon the reactants
- (d)
none of the above
The number of elements in the third and fourth periods
- (a)
18, 32
- (b)
32, 13
- (c)
18, 32
- (d)
20, 26
The element which have high electron affinity values are
- (a)
strong oxidising agents
- (b)
strong reducing agents
- (c)
weak oxidising agents
- (d)
weak reducing agents
The correct order of atomic size of Na, Be, Mg is
- (a)
Be > Mg > Na
- (b)
Na > Mg > Be
- (c)
Mg > Na > Be
- (d)
Mg > Be > Na
The size of atoms in any group shows a regular increase, the reason being as we go down any group
- (a)
the charge on the nucleus regulaly increases
- (b)
electrons are added to new orbits
- (c)
electronegativity regularly decreases
- (d)
the metallic character of the elements regularly increases
The group, from top to bottom
- (a)
Ionisation potential decreases
- (b)
electronegativity increases
- (c)
atomic size decreases
- (d)
basic nature of oxides decreases
All the elements do not have the same number of valence electrons in
- (a)
group I
- (b)
group II
- (c)
group VII
- (d)
zero group
Among the halogen, the lowest electronegativity is for
- (a)
F
- (b)
Cl
- (c)
I
- (d)
Br
Among the following the weak base is
- (a)
NaOH
- (b)
KOH
- (c)
Ca(OH)2
- (d)
Zn(OH)2
