Concern 75. (a) step one (b) 3 (c) dos (d) escort review Oakland cuatro Address: (b) step 3 Provider: pH = – diary [H + ] [H + ] = ten -3 pH = record step 1 – log [H + ] = journal 1 – diary 10 -step three = step 3
Concern 76. The device from ionic unit of liquids K is …………… (a) mol -step one L -1 (b) mol -2 L -dos (c) mol -2 L -step 1 (d) mol dos L -2 Answer: (d) mol dos L -2
Question 77. Review the equilibrium and choose the correct statement. HClO4 + H2O \(\rightleftharpoons\) H3O + + ClO4 + (a) HClO4 is the conjugate acid of H2O (b) H3O is the conjugate base of H2O (c) H2O is the conjugate acid of H3O (d) ClO4 is the conjugate base of HCIO4 Answer: (d) ClO4 is the conjugate base of HCIO4
Question 78. Which of the following is the strongest conjugate base? (a) CI – (b) CH3COO (c) SO4 2- (d) NO2 – Hint: CH3COO is a conjugate base of a weak acid. CH3COOH \(\rightleftharpoons\) CH3COO + H +
Question 79. Which one of the following substance has the highest proton affinity? (a) H2O (b) H2S (c) NH3 (d) PH3 Answer: (c) NH3
Question 80. Which of the following is the strongest Lewis acid? (a) BI3 (b) BBr3 (c) BCI3 (d) BF3 Hint: Larger the size of the halogen atom less is the back donation of electrons into empty 2p orbital of B.
Hence of adopting the is the weakest acid?
Question 81. (a) HF (b) HCI (c) HBr (d) Hello Address: (a) HF Clue: HF cannot render proton with ease.
Question 82. Among the following, the weakest Lewis base is ………… (a) H – (b) OH – (c) CI – (d) HClO3 – Hint: CI – is a conjugate base of strong acid HCI.
Question 83. Which of the following is not a Lewis acid? (a) BF3 (b) AlCI3 (c) HCl (d) LiAIH4 Hint: It is a nucleophile and capable of donating electron pair and so it can act as Lewis base.
Concern 84. What type of one’s adopting the is named amphoteric solvent? (a) Ammonium hydroxide (b) Chloroform (c) Benzene (d) H2o Answer: (d) Liquids Idea:
Question 85. Which of the following is non – electrolyte? (a) NaCl (b) CaCl2 (c) C12Htwenty-twoOeleven (d) CH3COOH Hint: C12H22O11 is a sugar and non-electrolyte.
An acid HA ionises just like the HA \(\rightleftharpoons\) H + + A great – The new pH of just one
Question 86. At infinite dilution, this new percentage ionisation both for good and you will poor electrolyte is …………. (a) 1% (b) 20% (c) 50% (d) 100% Answer: (d) 100% Hint: Based on Ostwald’s dilution rules, degree of ionisation was myself proportional to your dilution.
Concern 87. 0 Yards solution is 5. their dissociation lingering will be ………….. (a) step one x ten -5 (b) step 1 x 10 -ten (c) 5 (d) 5 x ten 8 Answer: (b) step 1 x ten -10
In which of the above does H2PO4 – act as an acid. (a) (i) only (b) (ii) only (c) (i) (iii) (d) (iii) only Answer: (b) (ii) only
Question 89. Which of the following is not a Lewis acid? (a) CO (b) SiCl4 (c) SO3 (d) Zn 2+ Answer: (c) SO3 CO does not contain vacant d-orbital.
Question 90. A chemist dissolves an excess of BaSO4 in pure water at 25°C if its Ksp = 1 x 10 -10 What is the concentration of Barium in the water? (a) 10 -14 M (b) 10 -5 M (c) 10 -15 M (d) 10 -6 M Answer: (d) 10 -6 M