Subject

Chemistry

Class

NEET Class 12

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NEET Chemistry Solved Question Paper 2016

Multiple Choice Questions

According to Bohr's theory, which of the following correctly represents the variation of energy and radius of an electron in n^th orbit of H-atom?

E_n $\propto \frac{1}{n^{2}}$ , r $\propto \frac{1}{n^{2}}$
E_n $\propto \frac{1}{n^{2}}$ , r $\propto n^{2}$
E_n $\propto$ n², r $\propto$ n²
E_n $\propto$ n, r $\propto \frac{1}{n}$

Best reagent for the conversion of AgNO₃ to Ag is

HClO₄
H₃PO₂
HIO₄
I₂

K_P for the reaction A $⇌$ B is 4. If initially only A is present then what will be the partial pressure of B after equilibrium?

Which of the following molecules has more than one lone pair ?

SO₂
XeF₂
SiF₄
CH₄

10 ml of liquid carbon disulphide (specific gravity 2.63) is burnt in oxygen. Find the volume of the resulting gases measured at STP.

23.25 L
22.26 L
23.50 L
20.08 L

Which of the following reactions does not take place?

BF₃ + F^- $\to$ B $F_{4}^{-}$ ...(I)

BF₃ + 3F^- $\to$ B $F_{6}^{3 -}$ ...(II)

AlF₃ + 3F^- $\to$ Al $F_{6}^{3 -}$ ...(III)

Only (I)
Only (II)
Only (III)
Only (I) and (III)

An element (X) belongs to fourth period and fifteenth group of the periodic table. Which one of the following is true regarding the outer electronic configuration of (X)? It has

partially filled d orbitals and completely filled s orbital
completely filled s orbital and completely filled p orbitals
completely filled s orbital and half-filled p orbitals
half-filled d orbitals and completely filled s orbital.

8.
Four diatomic species are listed below in different sequences. Which of these represents the correct order of their increasing bond order?

$C_{2}^{2 -}$ < ${He}_{2}^{+}$ < NO < $O_{2}^{-}$

${He}_{2}^{+}$ < $O_{2}^{-}$ < NO < $C_{2}^{2 -}$

$O_{2}^{-}$ < NO < $C_{2}^{2 -}$ < ${He}_{2}^{+}$

NO < $C_{2}^{2 -}$ < $O_{2}^{-}$ < ${He}_{2}^{+}$

${He}_{2}^{+}$ < $O_{2}^{-}$ < NO < $C_{2}^{2 -}$

According to molecular orbital theory, the energy level of the given molecules are

$C_{2}^{2 -} \to σ 1 s^{2} σ^{*} 1 s^{2} σ 2 s^{2} σ^{*} 2 s^{2} π 2 p_{x}^{2} π 2 p_{y}^{2} σ 2 p_{z}^{2}$

Bond Order : $\frac{1}{2} [10 - 4] = 3$

${He}_{2}^{+} \to σ 1 s^{2} σ^{*} 1 s^{1}$

Bond Order : $\frac{1}{2} [2 - 1] = \frac{1}{2} = 0.5$

NO $\to σ 1 s^{2} σ^{*} 1 s^{2} σ 2 s^{2} σ^{*} 2 s^{2} σ 2 p_{z}^{2} π 2 p_{x}^{2} π 2 p_{y}^{2} π^{*} 2 p_{x}^{1}$

Bond Order : $\frac{1}{2} [10 - 5] = 2.5$

$O_{2}^{-} \to σ 1 s^{2} σ^{*} 1 s^{2} σ 2 s^{2} σ^{*} 2 s^{2} σ 2 p_{z}^{2} π 2 p_{x}^{2} π 2 p_{y}^{2} π^{*} 2 p_{x}^{2} π^{*} 2 p_{y}^{1}$

Bond Order : $\frac{1}{2} [10 - 7] = 1.5$

So, the correct order of their increasing bond order is ${He}_{2}^{+} < O_{2}^{-} < NO < C_{2}^{2 -}$

The true statement for the acids of phosphorus, H₃PO₂ H₃PO₃ and H₃PO₄ is

the order of their acidity is H₃PO₄ > H₃PO₃ > H₃PO₂
all of them are reducing in nature
all of them are tribasic acids
the geometry of phosphorus is tetrahedral in all the three.

10.

Assertion : H₃BO₃is a weak acid.

Reason : Water extracts the proton of H₃BO₃.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false
If both assertion and reason are false.