Equal volumes of three acid solutions of pH 3.4 and 5 are mixed in a vessel. What will be the H⁺ ion concentration in the mixture?

• 1.11 x 10^-4 M

• 3.7 x 10^-4 M 

• 3.7 x 10^-3 M

• 3.7 x 10^-3 M

The angular shape of ozone molecule (O₃) consists of 

• 1 sigma and 2 pi bonds

• 2 sigma and 2 pi bonds

• 1 sigma and 1 pi bonds

• 1 sigma and 1 pi bonds

Which of the following are not state functions?
I) q + W
II) q
III) W
IV) H-TS

• (I) and (IV)

• (II) (III) and (IV)

• (I), (II) and (III)

• (I), (II) and (III)

If uncertanity in position and momentum are equal, then uncertaninty in velocity is 

The correct order of decreasing second ionisation enthalpy of Ti (22), V (23), Cr(24) and Mn (25) is 

• Cr > Mn> V > Ti

• V > Mn > Cr >Ti

• Mn > Cr> Ti >V

• Mn > Cr> Ti >V

If a gas expands at constant temperature, it indicates that

• the kinetic energy of molecules decrease

• the pressure of the gas increases

• the kinetic energy of molecules remains the same

• the kinetic energy of molecules remains the same

For the gas phase, reaction,

PCl₅ (g) ⇌ PCl₃ (g) Cl₂ (g)
Which of the following conditions are correct?

• Δ H = 0 and ΔS > 0

• ΔH >0 and ΔS > 0

• Δ H < 0 and ΔS < 0

• Δ H < 0 and ΔS < 0

Number of moles of MnO₄^- required to oxidies one mole of ferrous oxalate completely in acidic medium will be 

• 0.6 mole

• 0.4 mole

• 7.5 mole

• 7.5 mole

If the concentration of OH^- ions in the reaction Fe(OH)₃ (s)  ⇌ Fe³⁺ (aq) + 3OH^-(aq) is decreased by 1/4 times, then equilibrium concentration of Fe³⁺ will increase by 

• 8 times

• 16 times

• 64 times

• 64 times

The sequence of ionic mobility in aqueous solution is 

• K⁺ > Na⁺ > Rb⁺ > Cs⁺
  

• Cs⁺ > Rb⁺ > K⁺ >Na⁺

• Rb⁺ > K⁺> Cs⁺ > Na⁺

• Rb⁺ > K⁺> Cs⁺ > Na⁺