Assignment
(HYDER AB AD CLASSES ) LIMITED
1
JR_DAY(2)_30092011
Single Correct
1.
An oxide of sulphur ‘X’ has the v apour density equal to the molar mass of magnesium oxide. When
1 mol of ‘X’ is passed over 1 mol of Calcium oxide it forms 1 mol a compound ‘Y’ (of molecular
weight 136) as the only product which has ionic as well as covalent bonding. The hybridisation of ‘S’
in ‘X’ and ‘Y’ respectively are (Atomic mass of S=32, O=16, Mg=24, Ca=40)
2
2
2
3
2
3
3
3
(A) sp , sp
(B) sp , sp d
(C) sp , sp
(D) sp , sp
2.
The molecule which has see-saw shape is
(A) BCl3
(B) NCl3
3.
(C) ICl3
(D) XeO2F2
Electronic geometry of BrF5 can be represented as:
F
F
F
(I)
F
F
(II)
Br
F
I only
F
F
(B)
IV only
F
F
II & III only
(D)
4.
Which carbon is more electronegative than others?
3
(A) sp hybridized carbon
(B) sp hybridized carbon
2
(C) sp hybridized carbon
(D) The electron attracting power of C is always same irrespective of its hybrid state
5.
Among the given, covalent character is maximum in
(A) NaF
(B) Na2O
(C) Na3N
6.
Br
(IV)
F
(C)
F
F
Br
F
F
(A)
..
(III)
Br
..
F
F
F
..
F
Either of I, II,III
(D) Mg3N2
Among the following isoelectronic species the radii of gaseous ions decreases in the order
(A) Mg+2 > Na+ > F - > O -2
(B) O -2 > F - > Na + > Mg+2
7.
8.
(C) F - > O -2 > Na + > Mg+2
(D) Na + > Mg+ > O -2 > F -
The diagonal relationship is not shown by
(A) Li and Mg
(B) Be and Al
(C) B and Si
The increasing order of thermal stability of the following salts is
I. CaCO3
II. SrCO3
III. Cs2CO3
(A) I<II<III<IV
(B) IV<I<II<III
(C) I<IV<II<III
(D) P and S
IV.MgCO3
(D) I<IV<III<II
Multiple Correct
9.
Which of the following statement is / are correct?
3
0
(A) sp – hybrid orbitals arrange at 109 28’ to one another
2
0
(B) sp – hybrid orbitals arrange at 120 to one another
3
(C) sp d – hybrid orbitals are directed towards the corners of a regular tetrahedron
3 2
(D) sp d – hybrid orbitals are directed towards the corners of a regular octahedron
10.
Which of the following species will have linear shape?
(A) HCN
11.
(B) SO2
-
(C) CO2
(D) NO 2
Which of the following will have pyramidal shape?
(A) CH3+
(B) H3 O+
(C) NH3
(D) CH3-
F
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Assignment
2
(HYDER AB AD CLASSES) LIMITE D
12.
Which of the following orders or trends is/are not correct?
(A) SnCl2< CCl4 < BeCl2 (% s-character of the hybrid orbital of the central atom)
+
+
+
(B) Li >Na > K
(size)
(C) O > Mg > C
(electro negativity)
(D) He >Ne >Ar
(first ionisation energy)
13.
A molecule AB4 has two lone pairs on central atom ‘A’. Which of the following statements is /are
correct provided there is no B-B bond is present?
3 2
(A) hybridisation of ‘A’ in the molecule is sp d
(B) the percentage of dxy atomic orbital in the hybrid orbital of ‘A’ is 33.33%
(C) the molecule has same structure as that of XeO4
(D) there can not be any π bond in the molecule.
Paragraph for Question Nos. 14 to 15
Chemical properties of the elements depend upon their valence electrons, which in turn depends upon the
atomic number of the element. If the elements are arranged according to their increasing atomic number we
are able to divide them in groups and periods based upon similarity in their properties. This makes the study
of their properties like ionisation potential, electro negativity, atomic size easy.
14.
The atomic numbers of elements A, B, C and D are z-1, z, z+1 and z+2, respectively. If `B’ is a
noble gas, choose the correct statements.
(i) `A’ has highest electron affinity among these.
(ii) `C’ exists in +2 oxidation state in its stable compounds
(iii) `D’ is an alkaline Earth metal
(A) (I) and (II)
(B) (II) and (III)
(C) (I) and (III)
(D) (I), (II) and (III)
15.
In which of the following set of atomic numbers, all elements belong to the same group?
(A) 8, 16, 24
(B) 4, 11, 37
(C) 12, 20, 38
(D) 8, 18, 54
Paragraph for Question Nos. 16 to 18
A research scientist was analysing a chloride of phosphorous (X) and noticed that the compound contains
14.87% of phosphorous by mass and its molecular weight 208.5. When the compound (X) was strongly
heated, it expelled chlorine gas and formed additonal compound (Y) in which the phosphorus percentage
rised to 22.55%. Moreover (X) is a compound which exist as trigonal bipyramidal shaped molecule in
gaseous phase and crystallises into a tetrahedral cation (Q) and an octahedral anion (R) in solid state.(
Atomic mass of P=31 and Cl=35.5)
16.
17.
18.
The molecular formula of (X) is
(A) PCl3
(B) PCl4
(C) PCl5
The hybridisation of phosphorus in compound (Y) is
2
3
3 2
(A) sp
(B) sp d
(C) sp d
(D) P2Cl6
3
(D) sp
The number of sigma bonds formed by phosphorous in (X) and (Y) are respectively
(A) 3,5
(B) 6,4
(C) 5,3
(D) 4,4
Integer Type
19.
What is the total number of lone pair(s) on central atom in one molecule of XeF2?
20.
The number of 90 bond angles in the structure of H2O is ‘x’, number of 180 bond angle in the
0
+
structure of XeF2 is ‘y’, and number of 109 28’ bond angle in the structure of NH4 is ‘z’. Find the
value of (x+ y+ z).
21.
How many atoms from the following list will have their first ionisation energy more than that of Al?
B, Mg, Na, Ar, Si, C, K, P
22.
Find the number of planar /linear molecules from the following list
NH3, XeF4, SF4, ICl3, CH4, XeO4, CS2, HCN
0
0
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Assignment
(HYDER AB AD CLASSES ) LIMITED
3
23.
How many statements from the following list is/are correct?
(i) AlF3 is more ionic than AlCl3 because of lower Polarizability of F
(ii) The correct order of strengths of overlapping of atomic orbitals is: P-P(sigma) > S-P > S-S
(iii) The molecular shapes of SO 32- and SO 24- is same
(iv) Melting point of MgBr2 is greater than that of ZnBr2
24.
An element in the periodic table having atomic number 24 is placed in X th period. It has ‘ Y ’
unpaired electrons in its ground state. A compound of ‘Xenon’ and ‘F’ contains ( Y-X ) lone pair(s) on
‘Xe’. What is the number of ‘F’ atoms present per molecule of this compound?
25.
Calculate the Total number of pπ-pπ bonds present in the following molecule
H
H
H
C
C
H
H
C
H
H
O
C
C
H
C
C
H
H
C
N
H
26.
How many compounds from the following list will not have any lone pair on central atom?
ClF3, XeO4, XeO3, OSF4, NH3, PCl5
27.
For how many species among the given list, the expansion of octet is there for central atom?
+
+
BF3, PCl3, BeCl2, CH3 , H3O
28.
How many species from the following list will have all three types of bonds (ionic, covalent and
dative)?
+
SF6, KOH, NH4Cl, H3O , BF4 & MgCl2
ANSWERS
1.
C
2.
D
3.
D
4.
B
5.
D
6.
B
7.
D
8.
B
9.
A, B,D
10.
A, C
11.
B,C,D
12.
A, B, C
13.
A,D
14.
C
15.
C
16.
C
17.
D
18.
C
19.
3
20.
7
21.
6
22.
4
23.
3
24.
4
25.
4
26.
3
27.
0
28.
1
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