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

Matter 76. The product regarding ionic unit out of liquids K try …………… (a) mol -step 1 L -step 1 (b) mol -dos L -2 (c) mol -dos L -step one (d) mol dos L -2 Respond to: (d) mol 2 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.

And that of your own following the is the weakest acidic?

Question 81. (a) HF (b) HCI (c) HBr (d) Hey Address: (a) HF Hint: HF will not promote proton easily.

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.

Matter 84. What type of your following the is known as amphoteric solvent? (a) Ammonium hydroxide (b) Chloroform (c) Benzene (d) Liquids Answer: (d) Water Idea:

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

An acid HA ionises because HA \(\rightleftharpoons\) H + + A good – New pH of just one

Concern 86. At the unlimited dilution, the fee ionisation for good and you may weak electrolyte are …………. (a) 1% (b) 20% (c) 50% (d) 100% Answer: (d) 100% Hint: Centered on Ostwald’s dilution rules, level of ionisation try truly proportional into the dilution.

Concern 87. 0 M option would be 5. its dissociation lingering would be ………….. (a) 1 x ten -5 (b) step one x ten -ten (c) 5 (d) 5 x 10 8 Address: (b) step 1 x 10 -ten

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