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JEE Chemistry Solved Question Paper 2013

Multiple Choice Questions

Which of the following will have the shape of a trigonal bipyramid?

PF₃Cl₂
IF₅
BrF₅
SbF $_{5}^{2 -}$

The example of σ-complex is

Fe(η⁵-C₅H₅)₂
[Cr(CO)₆]
Al₂(CH₃)₆
Zeiss salt

The bond present in N₂O₅ are

only ionic
covalent and coordinate
only covalent
covalent and ionic

5 millimoles of caustic potash and 5 millimoles of oxalic acid are mixed and dissolved in 100 mL water. The solution will be

basic
acidic
neutral
cannot say

How many moles of O₂ can be obtained by electrolysis of 90 g H₂O?

5.0 mol
0.5 mol
2.5 mol
0.25 mol

Four different sets of quantum numbers for 4 electrons are given below:

e₁ = 4, 0, 0, - $\frac{1}{2}$

e₂ = 3, 1, 1, - $\frac{1}{2}$

e₃ = 3, 2, 2, + $\frac{1}{2}$

e₄ = 3, 0, 0, + $\frac{1}{2}$

The order of energy of e₁, e₂, e₃, e₄ is

e₁> e₂> e₃> e₄
e₄> e₃> e₂> e₁
e₃> e₁> e₂> e₄
e₂> e₃> e₄> e₁

Which of the following nuclei is most unstable?

${}_{20}^{40}{Ca}$
${}_{35}^{55}{Mn}$
${}_{50}^{119}{Sn}$
${}_{13}^{30}{Al}$

Electron affinity is positive when

O^- is formed from O
O^2- is formed from O^-
O⁺ is formed from O
electron affinite is always a negative value

9.
When solid melts, there will be

a decrease in enthalphy

a decrease in free energy

a decrease in entropy

all the above factors remain constant

a decrease in free energy

When a solid substance changes into its liquid state at its melting point, the process takes place by absorption of heat from the surroundings. e.g., melting of ice

H₂O (s) $\to$ H₂O (l)

Thus, enthalpy change for this process is positive or there is an increase in enthalpy, but still the reaction is spontaneous, because the liquid state ofwateris more random than its solid state. Hence, it may be concluded that melting of ice is accompanied by an increase of entropy.

$∆ G = ∆ H - T ∆ S$

For a reaction to be spontaneous, the value of $∆$ G, i.e., the Gibbs' free energy change must be negative or there must be a decrease in free energy, thus, $∆$ H must be smaller than T $∆$ S.