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NEET Chemistry Solved Question Paper 2011

Multiple Choice Questions

Which has the maximum number of molecules among the following?

44 g CO₂
48 g O₃
8 g H₂
8 g H₂

1228 Views

According to the Bohr theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?

n= 6 to n = 1
n = 5 to n = 4
n= 6 to n = 5
n= 6 to n = 5

1526 Views

Consider the following processes Δ H (kJ/mol)

1/2 A → +150
3B   → 2 C + D -125
E + A  → 2D +350

For B + D   → E + 2C, ΔH will be

525 kJ/mol
-175 kJ/mol
-325 kJ /mol
-325 kJ /mol

440 Views

4.
Which of the following structures is the most preferred and hence of lowest energy of SO₃ ?

Formal charges help in the selection of the lowest energy structure from a number of possible energy structure from a number of possible Lewis structures for a given species. Generally, the lowest energy structure is the one with the smallest formal charges on the atoms.

Formal charge on an atom: = total number of valence electrons- non - bonding electrons - 1/2 x bonding electrons.

For lewis structure of SO₃

Formal charge on three O atoms

1058 Views

A bubble of air is underwater at temperature 15^o C and the pressure 1.5 bar. If the bubbles rises to the surface where the temperature is 25^o C and the pressure is 1.0 bar, what will happen to the volume of the bubble?

Volume will become greater by a factor of 1.6
Volume will become greater by a factor of 1.1
Volume will become smaller by a factor of 0.70
Volume will become smaller by a factor of 0.70

835 Views

What is the value of electron gain enthalpy of Na⁺ if IE₁ of Na = 5.1 eV?

-5.1 eV
-10.2 eV
+2.55 eV
+2.55 eV

594 Views

Match (I) with list (II) for the compositions of substances and select the correct answer using the code given below the lists.

	List I (substance)		List II Composition
A.	Plaster of Paris	1.	CaSO₄.2H₂O
B.	Epsomite	2.	CaSO₄. ½ H₂O
C.	Kieserite	3.	MgSO₄. 7H₂O
D.	Gypsum	4. 5.	MgSO₄.H₂O CaSO₄

A

B

C

D

3

4

1

2
A

B

C

D

2

3

4

1
A

B

C

D

1

2

3

5
A

B

C

D

1

2

3

5

437 Views

The half -life of a substance in a certain enzyme catalysed reaction is 138 s. The time required for the concentration of the substance to fall from 1.28 mg L^-1 is