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# NEET Chemistry Solved Question Paper 2007

#### Multiple Choice Questions

1.

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

2.

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

3.

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

4.

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

5.

The correct sequence of increasing covalent character is represented by

• LiCl < NaCl < BeCl2

• BeCl2 < NaCl < LiCl

• NaCl < LiCl < BeCl2

• BeCl2 < LiCl < NaCl

6.

Which of the following molecules has trigonal planar geometry?

• IF3

• PCl3

• NH3

• BF3

7.

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

8.

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

# 9.Which of the following is the electron deficient molecule?B2H6 C2H6 PH3 SiH4

A.

B2H6

B2H6 is electron deficient molecule because boron atom has three half filled orbitals in excited state. The structure of B2H6 is represented as follows :

In it two electrons of a B - H bond are involved in formation of three centre bond, these bonds are represented as dotted lines.

10.

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

• one-fifth

• five

• one

• two