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# NEET Chemistry Solved Question Paper 2010

#### Multiple Choice Questions

1.

CaO and NaCl have the same crystal structure and approximately the same ionic radii. If U is the lattice energy ofNaCI, the approximate lattice energy of CaO is

• U/2

• U

• 2U

• 4U

D.

4U

Lattic energy =$-\frac{{\mathrm{q}}_{1}{\mathrm{q}}_{2}}{{\mathrm{r}}^{2}}$where q1 and q2 are charges on ions and r is the distance between them. Since interionic distances in CaO and NaCl are similar, (larger cation has smaller anion and vice versa) therefore, r is almost the same. Therefore, lattice energy depends only on charge. Since the magnitude of charge on Na+ and Cl-ions is unity and that on Ca2+ and O2- ions is 2 each, therefore, the lattice energy of CaO is four times the lattice energy of NaCl, i.e..4U.

2.

100 cm3 of a given sample of H2O2 gives 1000 cm3 of O2 at S.T.P. The given sample is

• 10% H2O2

• 90% H2O2

• 10 volume H2O2

• 100 volume H2O2

C.

10 volume H2O2

Hydrogen peroxide can easily break down, or decompose, into water and oxygen by breaking up into two very reactive parts- either 2OH or an H and HO2.

or 1ml of H2O2 will give 10 ml of O2 at STP.

3.

Beryllium and aluminium exhibit many properties which are similar. But the two elements differ in

• maximum covalency in compounds

• exhibiting amphoteric nature in their oxides

• forming covalent halides

• forming polymeric hydrides

A.

maximum covalency in compounds

Be exhibits maximum covalency of four whereas Al shows maximum covalency of six.

4.

Match List I with List II and select the correct answer using the codes given below the lists:

 List I List II A. $\left(\frac{\mathrm{\delta G}}{\mathrm{\delta P}}{\right)}_{\mathrm{T}}$ 1.  ${\mathrm{\mu }}_{\mathrm{\pi }}$ B. $\left(\frac{\mathrm{\delta G}}{\mathrm{\delta T}}{\right)}_{\mathrm{P}}$ 2.  T C. $\left(\frac{\mathrm{\delta H}}{\mathrm{\delta S}}{\right)}_{\mathrm{P}}$ 3. -S D. $\left(\frac{\mathrm{\delta T}}{\mathrm{\delta P}}{\right)}_{\mathrm{H}}$ 4. P 5. V

• A-5, B-1, C-2, D-4

• A-5, B-3, C-2, D-4

• A-3, B-5, C-2, D-1

• A-5, B-3, C-2, D-1

D.

A-5, B-3, C-2, D-1

From thermodynamics, dG = VdP-SdT

At constant T, dT = 0 so that

At constant P dP = 0 so that

Also

5.

In the ground state of Cu2+ the number of shells occupied, subshells occupied, filled orbitals and unpaired electrons respectively are

• 4, 8, 15 0

• 3, 6, 15, 1

• 3, 6, 14, 0

• 4, 7, 14, 2

C.

3, 6, 14, 0

Cu= 1s2 2s2 2p6 3s2 3p6 3d6

So, Shells occupied =3, sub- shell occupied = 6, filled orbital = 14 and unpaired electron = 0

6.

Equal weight of CO and CH4 are mixed together in an empty container at 300 K. The fraction of total pressure exerted by CH4 is.

• $\frac{16}{17}$

• $\frac{7}{11}$

• $\frac{8}{9}$

• $\frac{5}{16}$

B.

$\frac{7}{11}$

Let tje weight of CO = weight of CH4

Total moles = $\frac{\mathrm{a}}{28}+\frac{\mathrm{a}}{16}$

fraction of pressure exerted by CH4 = 7/11

7.

Which of the following is correct?

• Ionic radius is proportional to atomic number.

• Ionic radius is inversely proportional to atomic mass.

• Ionic radius is inversely proportional to effective nuclear charge.

• All are correct.

C.

Ionic radius is inversely proportional to effective nuclear charge.

${\mathrm{r}}_{\mathrm{ionic}}\propto \frac{1}{{\mathrm{Z}}_{\mathrm{eff}}}$

8.

What is the pH of0.01 M glycine solution? For glycine Ka1= 4.5x10-3 and Ka2=1.7x10-10 298 K.

• 3.0

• 10.0

• 7.06

• 8.2

C.

7.06

Glycine H3N+CH2COO- is more acidic than basic. Instead of Kb value, the second given Ka value is corresponding to the Kb value ( Ka $×$ Kb = 10-14). Hence, overall ionization constant,

K= Ka1 $×$ Ka2

= 4.5 $×$10-3 $×$ 1.7

pH =-log (0.87 $×$ 10-7) = 7.06

9.

Two flasks X and Y have capacity 1L and 2L respectively and each of them contains 1 mole of a gas. The temperatures of the flasks are so adjusted that average speed of molecules in X is twice as those in Y. The pressure in flask X would be

• same as that in Y

• half of that in Y

• twice of that in Y

• 8 times ofthat in Y

D.

8 times ofthat in Y

=8

10.

Which ofthe following sequence contains atomic number of only representative elements?

• 55,12,48,53

• 13,33,54,80

• 3,33,53,87

• 22,33,55,66.

C.

3,33,53,87

Sequence (c) contains only representative elements.