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NEET Chemistry Solved Question Paper 2007

Multiple Choice Questions

The pair of compound which cannot exists together in solution is

NaHCO₃ and NaOH
Na₂CO₃ and NHCO₃
Na₂CO₃ and NaOH
NaHCO₃ and NaCl

NaHCO₃ and NaOH

Acidic salt (NaHCO₃) and base (NaOH) cannot exist together in solution.

Which has maximum number of atoms ?

24 g of C
56 g of Fe
26 g of Al
108 g of Ag

24 g of C

$No . of atoms in 24 g of C = \frac{24}{12} \times 6.02 \times 10^{23} = 2 \times 6.02 \times 10^{23} No . of atoms in 56 g of Fe = \frac{56}{56} \times 6.02 \times 10^{23} No . of atoms in 26 g of Al = \frac{26}{27} \times 6.02 \times 10^{23} \approx 6.02 \times 10^{23} No . of atoms in 108 g of Ag = \frac{108}{108} \times 6.02 \times 10^{23} = 6.02 \times 10^{23}$

4.6 x 10²² atoms of an element weigh 13.8g. The atomic weight of that element is

290
180
34.4
10.4

180

$4.6 \times 10^{22} atoms weigh = 13.8 g Hence, 6.02 \times 10^{13} atoms will weigh = \frac{13.8 \times 6.02 \times 10^{23}}{4.6 \times 10^{22}} = 180.6 g (molar mass)$

Number of lone pair (s) in XeOF₄ is/are

The number of lone pair in XeOF₄ is one (1). The structure of XeOF₄ is given as follows :

Which of the following has the smallest number of molecules ?

0.1 mole of CO₂ gas
11.2 L of CO₂ gas at STP
22 g of CO₂ gas
22.4 x 10³mL of CO₂ gas at STP

0.1 mole of CO₂ gas

(a) 0.1 mole of CO₂

$(b) \frac{11.2}{22.4}$ = 0.5 mole of CO₂

(d) $\frac{22.4 \times 10^{3}}{22400}$ = 1 mole of CO₂

Hence, the number of moles of CO₂ is least ie, 0.1.

Which one ofthe following compounds has sp² hybridisation ?

CO₂
SO₂
N₂O
CO

SO₂

In SO₂ molecule, S is sp²-hybridised

S(16) = 1s², 2s², 2p⁶, 3s², 3p⁴

In homogeneous catalysis

the reactants, catalyst and products are in the same phase.
the catalyst and reactants are in the same phase.
the catalyst and products are in the same phase.
the reactants and products are in the same phase.

the catalyst and reactants are in the same phase.

Homogenous catalysis - When the reactants and catalyst are in the same phase, the catalysis is known as homogenous catalysis.
Example: $2 {KClO}_{3} (s) \overset{{MnO}_{2} (s)}{\to} 2 KCl (s) + 3 O_{2} (g)$

Identify the least stable ion amongst the following.

Li^-
Be^-
B^-
C^-

B^-

Li^-= 1s², 2s² (In it all sub-shells are saturated so, it is stable).

Be^- = 1s², 2s², 2p¹(very much less stable).

B^- = 1s^2, 2s², 2p² (less stable)

C^- = 1s², 2s², 2p³ (stable due to presence of half-filled 2p-subshell).

A liquid is in equilibrium with its vapour at it's boiling point. On the average, the molecules in two phases have equal

inter- molecular forces
potential energy
kinetic energy
total energy

kinetic energy

In liquid $⇌$ vapour, equilibrium the rate at which molecules escape from the liquid surface to gaseous phase equals to rate at which molecules in the gas phase strike the surface and becomes the part of liquid. Hence, the molecules in the two phases have equal kinetic energy.