NEET TEST SERIES 104 CHEMISTRY
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1. Which of the following ion is the smallest in size ?
a) Na+
b) Mg
2+
c) Al
3+
d) N
3-
Deselect Answer
a)
b)
c)
d)
None
2. If first IE of elements A and B are 520 KJ/mol and 630 KJ/mol respectively and second IE of A and B are 2960 KJ/mol and 1206 KJ/mol respectively. Then the correct statement is
a) Both A and B are alkaline earth metals
b) Both A and B are alkali metals
c) A is an alkali metals and B is an alkaline earth metals
d) B is an alkali metals and A is an alkaline earth metals
Deselect Answer
a)
b)
c)
d)
None
3. In octahedral structure (all are bond pair with no lone pair) MX
6
, the number of X-M-X bonds at is :
a) 2
b) 3
c) 4
d) 6
Deselect Answer
a)
b)
c)
d)
None
4. A sigma bonded molecule MX
4
is See Saw shape. The number of non – bonding pairs of electron is
a) 1
b) 2
c) 3
d) 4
Deselect Answer
a)
b)
c)
d)
None
5. In BrF
3
molecule, the lone pairs occupy equatorial positions to minimize
a) Lp- lp repulsion only
b) Lp- bp repulsion only
c) Lp- lp repulsion and Lp-bp repulsion
d) Bp – Bp repulsion only
Deselect Answer
a)
b)
c)
d)
None
6. The manganate and permanganate ions are tetrahedral due to
a) The p- bonding involves overlap of p- orbitals of Oxygen with d – orbitals of manganese
b) The p- bonding involves overlap of d- orbitals of Oxygen with p – orbitals of manganese
c) There is no p- bonding
d) The p- bonding involves overlap of d- orbitals of Oxygen with d – orbitals of manganese
Deselect Answer
a)
b)
c)
d)
None
7. Choose the incorrect statement
a) Na
2
Cr
2
O
7
is preferred over K
2
Cr
2
O
7
in volumetric analysis.
b) K
2
Cr
2
O
7
solution becomes yellow on increasing the pH beyond 7
c) KMnO
4
Titrations are carried out only in the presence of dil.H
2
SO
4
d) Cr (V) undergoes disproportionation in acidic medium to Cr (VI) and Cr (III)
Deselect Answer
a)
b)
c)
d)
None
8. Which of the following Lanthanoid ions is Diamagnetic ?
a) Ce
2+
b) Yb
2+
c) Eu
2+
d) Gd
2+
Deselect Answer
a)
b)
c)
d)
None
9. According to the Bohr theory, which of the following transitions in the H-atom will give rise to the least energetic photon ?
a) n=5 to n=3
b) n=5 to n=4
c) n=6 to n=1
d) n=6 to n=5
Deselect Answer
a)
b)
c)
d)
None
10. The uncertainty in momentum of an electron is m/s. The uncertainty in its position will be ( kg /s)
a) 1. 25 X 10
-34
m
b) 3. 01 10
-34
m
c) 5.27 x 10
-30
m
d) 5.27 x 10
-20
m
Deselect Answer
a)
b)
c)
d)
None
11. Aluminium (III) chloride forms a dimer because
a) Al has high IE
b) Cannot form a trimer
c) Al can have higher coordination number
d) Both belongs to p- block
Deselect Answer
a)
b)
c)
d)
None
12. Borax is prepared by treating boric acid with
a) NaCl
b) NaNO
2
c) Na
2
CO
3
d) NaHCO
3
Deselect Answer
a)
b)
c)
d)
None
13. Which of the following ion undergo Self oxidation and reduction
a) Al
3+
and Na
+
b) Al
3+
and Ga
+
c) Ga
+
and In
+
d) In
+
and Tl
+
Deselect Answer
a)
b)
c)
d)
None
14. Which of the statements about denaturation given below are correct ?
1. Denaturation of protein affects primary structure.
2. Denaturation of protein causes loss of secondary and tertiary structure.
3. Denaturation of protein leads to the conversion of double strand of DNA into single strand.
a) All are correct
b) 2 and 3
c) 3 only
d) 1 and 2
Deselect Answer
a)
b)
c)
d)
None
15. Which of the following is not a fat soluble vitamin
a) Vitamin A
b) Vitamin D
c) Vitamin B
d) Vitamin E
Deselect Answer
a)
b)
c)
d)
None
16. Decomposition of H
2
O
2
follows a first order reaction. In 50 min the concentrations of H
2
O
2
decreases from 0.5 to 0.125 M in one such decomposition. When the concentration of H
2
O
2
reaches 0.05 M, the rate of formation of O
2
will be?
a) 6.93×10
−4
mol min
−1
b) 2.66L min
−1
at STP
c) 1.34×10
−2
mol min
−1
d) 6.93×10
−2
mol min
−1
Deselect Answer
a)
b)
c)
d)
None
17. Al
2
O
3
is reduced by electrolysis at low potentials and high current. If 0×10
4
amperes of current is passed through molten Al
2
O
3
for 6 hours, what mass of aluminum is produced? (Assume 100 % current efficiency, At. mass of Al = 27u)
a) A. 1.3×10
4
g
b) 2.4×10
5
g
c) 8.1×10
4
g
d) 9.0×10
3
g
Deselect Answer
a)
b)
c)
d)
None
18. When 4 Lof H
2
(g) is mixed with 11.2 of Cl
2
(g), each at STP, the moles of HCl (g) formed is equal to?
a) 1 mole of HCl (g)
b) 2 moles of HCl (g)
c) 0.5 mole of HCl (g)
d) 1.5 mole of HCl (g)
Deselect Answer
a)
b)
c)
d)
None
19. 5 g of an impure sample of sodium sulphate dissolved in water was treated with excess of barium chloride solution when 1.74 g of BaSO
4
was obtained as dry precipitate. Calculate the percentage purity of the sample.
a) 60.4 2
b) 70.67
c) 84.16
d) 90.32
Deselect Answer
a)
b)
c)
d)
None
20. Total vapour pressure of mixture of 1 mol A ( 150 torr) and 2 mol B ( 240 torr) is 200 torr. In this case :
a) there is a negative deviation from Raoult’s law
b) there is a positive deviation from Raoult’s law
c) there is no deviation from Raoults law
d) cannot be decided
Deselect Answer
a)
b)
c)
d)
None
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