The newest pH off millimolar HCl are …………

Concern 75. (a) step 1 (b) step three (c) dos (d) cuatro Respond to: (b) step 3 Provider: pH = – record [H + ] [H + ] = 10 -step 3 pH = diary step one – record [H + ] = log step one – diary ten -step 3 = 3

Matter 76. The device of ionic device away from liquid K is actually …………… (a) mol -step 1 L -1 (b) mol -dos L -2 (c) mol -2 L -step one (d) mol 2 L -dos Respond to: (d) mol dos L -dos

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.

And this of your adopting the is the weakest acidic?

Concern 81. (a) HF (b) HCI (c) HBr (d) Hello Respond to: (a) HF Hint: HF doesn’t bring 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 your adopting the is called amphoteric solvent? (a) Ammonium hydroxide (b) Chloroform (c) Benzene (d) H2o Address: (d) Liquids Clue:

Question 85. Which of the following is non – electrolyte? (a) NaCl (b) CaCl₂ (c) C_severalH_twenty-twoO_eleven (d) CH₃COOH Hint: C₁₂H₂₂O₁₁ is a sugar and non-electrolyte.

An acid HA ionises just like the HA \(\rightleftharpoons\) H + + An effective – The brand new pH of just one

Concern 86. At unlimited dilution, the latest payment ionisation for both strong and weakened electrolyte was …………. (a) 1% (b) 20% (c) 50% (d) 100% Answer: (d) 100% escort services in Lancaster Hint: Based on Ostwald’s dilution laws, standard of ionisation is yourself proportional to your dilution.

Concern 87. 0 Yards solution is 5. the dissociation constant could well be ………….. (a) 1 x 10 -5 (b) step 1 x 10 -10 (c) 5 (d) 5 x ten 8 Address: (b) 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 K_sp = 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