SAT Chemistry - Periodic Classification of Elements
Exam Duration: 45 Mins Total Questions : 30
O-2is isoelectronic with F-. Then
- (a)
they have identical size
- (b)
O-2 ion is bigger than F- ion
- (c)
O-2 ion is smaller than F- ion
- (d)
Both of them have same number of protons
The general trend of valency as we move from top to bottom is 2nd group of period table is
- (a)
increases
- (b)
decreases
- (c)
first increases then decreases
- (d)
remains the same
Isoelectronic species have
- (a)
same no. of protons but different no. of electrons
- (b)
same no. of protons but different no. of neutrons
- (c)
Same no. of electrons but different no. of protons
- (d)
same no. of electrons and protons
Which of the following has the smallest size
- (a)
Na
- (b)
K
- (c)
Rb
- (d)
Na+
The properties which generally increase as we move down a group is
- (a)
Metallic character and ionisation enthalpy
- (b)
Electro-negativity and electron gain enthalpy
- (c)
EIectro-positive character and atomic radius
- (d)
Ionic radius and ionisation enthalpy
Mendeleev classified elements in
- (a)
increasing order of atomic number
- (b)
increasing order of atomic masses
- (c)
decreasing order of atomic masses
- (d)
decreasing order of atomic number
In the long form of periodic table lanthanides are placed in the
- (a)
2nd period
- (b)
5th period
- (c)
6th period
- (d)
7th period
Which of the following pairs of elements belong to the same period of the periodic table
- (a)
C, Mg
- (b)
N, Ar
- (c)
Ca, Cl
- (d)
K, Cu
One important merit of modem periodic table is
- (a)
it explains why elements in the same group have the same chemical properties
- (b)
hydrogen has been placed accurately.
- (c)
isobars have not been placed separately
- (d)
it is based on classifying elements according to their atomic masses
Which of the following has the maximum non-metallic character?
- (a)
F
- (b)
Cl
- (c)
Br
- (d)
I
Which of the following elements has maximum metallic character?
- (a)
Li
- (b)
N
- (c)
Na
- (d)
P
The arrangement of the elements according to their atomic numbers rather than their atomic weights is a consequence of the research work of
- (a)
Li, Na, K
- (b)
Ca, Sr, Ba
- (c)
Fe, Co, Ni
- (d)
F, Cl, Br
Which one of the following elemenls has the largest atomic radius?
- (a)
Sodium
- (b)
Potassium
- (c)
Magnesium
- (d)
Aluminium.
The following process
X(g) + e- ⟶ X- (g)
is exothermic, which of the following could be the species X?
- (a)
Na
- (b)
I
- (c)
S-
- (d)
O-
The electronegativities of the elements P, O, F and Cl follow the order
- (a)
F > Cl > O > S
- (b)
F > 0 > Cl > S
- (c)
F > S > O > Cl
- (d)
F > Cl > S > O
Which one of the following will have the largest size?
- (a)
Br
- (b)
Cl
- (c)
I
- (d)
I-
For question 30 and 31 use the information given below:
| Element | W | X | Y | Z |
| Atomic Number | 7 | 14 | 15 | 18 |
Which of the two elements are in the same group of the periodic table?
- (a)
Wand X
- (b)
Wand Y
- (c)
X and Z
- (d)
Y and Z.
Lothar Meyer's curve was plotted between
- (a)
atomic number and atomic volume
- (b)
atomic mass and atomic volume
- (c)
atomic number and atomic mass
- (d)
none of the above
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
A nonpolar covalent bond is formed when a covalent bond is formed between
- (a)
two dissimilar atoms having different electronegativities
- (b)
two similar atoms having same electronegativity
- (c)
two dissimilar atoms having similar electronegativity
- (d)
none of the above
On moving from left to right in the 3rd period the valency with respect to hydrogen
- (a)
ncreases from 1 to 4 and then decreases
- (b)
increases continuously from 1 to 7
- (c)
does not show any gradual chang
- (d)
none
A common trend to both groups I and VII elements in the periodic table as the atomic number increases is
- (a)
oxidising power increases
- (b)
atomic radius increases
- (c)
maximum valency increases
- (d)
reactivity with water increases
As we move along the periodic table from left to right the atomic size decreases. However noble gases have the largest size because o
- (a)
covalent radii
- (b)
ionic radii
- (c)
vander waal's radii
- (d)
stable octet
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 number of elementary gases in the periodic table is
- (a)
6
- (b)
11
- (c)
19
- (d)
15
Alkali metals are powerful reducing elements because
- (a)
they are monovalent
- (b)
their atomic radii are large
- (c)
their IP are very low
- (d)
they are metals
The reducing power among halogens varies as
- (a)
I > Br > Cl > F
- (b)
Br > I > Cl > F
- (c)
F> I > Br > Cl
- (d)
Cl > F > Br > I
The miniumum ion.isation. energy from the isoelectroruc species Ca+2 , K+, Ar and Cl- is of:
- (a)
Cl-
- (b)
Ar
- (c)
Ca+2
- (d)
K+
Among the following the weak base is
- (a)
NaOH
- (b)
KOH
- (c)
Ca(OH)2
- (d)
Zn(OH)2
Which of the following does not reflect the periodicity of element?
- (a)
bonding behaviour
- (b)
electronegativity
- (c)
ionisation potential
- (d)
neutron / proton ratio
