The correct order of ionization energies is

• Cu > Ag > Au

• Cu > Au > Ag

• Au > Cu > Ag

• Ag > Au > Cu

Among the following compounds both coloured and paramagnetic one is

• K₂Cr₂O₇

• VOSO₄

• (NH₄)₂.[TiCl₂]

• K₃[Cu(CN)₄]

Which of the following has maximum bond energy?

• C=C

• C=O

• O=O

• N=O

An organic compound crystallises in an ortho rhombic system with two molecules per unit cell. The unit cell dimensions are 12.05, 15.05 and 2.69 Å. If the density of the crystal is 1.419 g cm^-3, then molar mass of compound will be 

• 207 g mol^-1

• 209 g mol^-1

• 308 g mol^-1

• 317 g mol^-1

The molarity of a solution in which 5.3 g Na₂CO₃ is dissolved in 500 mL will be

• 1.0 M

• 0.1 M

• 0.20 M

• 0.2 M

1 mL of 0.01 N HCl is added to 999 mL solution of 0.1 N Na₂SO₄. The pH of the resulting solution will

• 2

• 7

• 5

• 1

The equilibrium constants for the reaction,

Br₂ $\rightleftharpoons$ 2Br → 1

at 500 K and 700 K are 1 × 10^-10 and 1 × 10^-5 respectively. The reaction is

• endothermic

• exothermic

• fast

• slow

A chemist wishes to prepare a buffer solution of pH = 2.90 that efficiently resists a change in pH yet contains only small concentration of buffering agents which one of the following weak acid along with its salt would be best to use 

• m-chlorobenzoic acid (pK_a = 3.98)

• Acetoacetic acid (pK_a = 3.58)

• 2 5-dihydrobenzoic acid (pK_a = 2.97)

• p-chlorocmanic acid (pK_a = 4.41)

If 5 L of H₂O₂ produces 50 L of O₂ at NTP, H₂O₂ is

• 50 volume

• 10 volume

• 5 volume

• None of the above

20.

The wave number of hydrogen atom in Lyman series is 82200 cm^-1. The electron goes from

• n₃ → n₂

• n₂ → n₁

• n₄ → n₃

• None of these