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# NEET Chemistry Solved Question Paper 2007

#### Multiple Choice Questions

1.

Which of the following molecules has trigonal planar geometry?

• IF3

• PCl3

• NH3

• BF3

2.

The correct sequence of increasing covalent character is represented by

• LiCl < NaCl < BeCl2

• BeCl2 < NaCl < LiCl

• NaCl < LiCl < BeCl2

• BeCl2 < LiCl < NaCl

3.

The mass of carbon anode consumed (giving only carbondioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is (Atomic mass Al= 27)

• 180 kg

• 270 kg

• 540 kg

• 90 kg

4.

Which of the following is the electron deficient molecule?

• B2H6

• C2H6

• PH3

• SiH4

5.

A reaction occurs spontaneously if

• T$∆$S < $∆$H and both $∆$H and $∆$S are +ve

• T$∆$S > $∆$H and both $∆$H and $∆$S are +ve

• T$∆$S = $∆$H and both $∆$H and $∆$S are +ve

• T$∆$S > $∆$H and $∆$H is +ve and $∆$S is - ve

6.

The absolute enthalpy of neutralisation of the reaction

MgO(s) + 2HCl(aq) $\to$ MgCl2(aq) + H2O(l)

will be

• less than - 57.33 kJ mol-1

• - 57.33 kJ mol-1

• greater than-- 57.33 kJ mol-1

• 57.33 kJ mol-1

7.

The number of moles of KMnO4 reduced by one mole of KI in alkaline medium is

• one-fifth

• five

• one

• two

8.

A nuclide of an alkaline earth metal undergoes radioactive decay by emission of three $\mathrm{\alpha }$-particles in succession. The group of the periodic table to which the resulting daughter element would belong to

• Group 14

• Group 16

• Group 4

• Group 6

# 9.Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction?Exothermic and decreasing disorder Endothermic and increasing disorder Exothermic and increasing disorder Endothermic and decreasing disorder

C.

Exothermic and increasing disorder

If a reaction is exothermic, $∆$H will be -ve and in increasing order, $∆$S will be +ve thus, at this condition, $∆$G is negative according to following equation:
$∆$G = $∆$H - T$∆$S

$∆$G = -ve.

Hence, for spontaneous reaction $∆$G must be -ve

10.

Equilibrium constants K1 and K2 for the following equilibria
NO (g) +  $\stackrel{{\mathrm{K}}_{1}}{⇌}$ NO2(g) and

2NO2(g) $\stackrel{{\mathrm{K}}_{2}}{⇌}$ 2NO (g) + O2(g)

are related as