The new pH away from millimolar HCl try …………

Concern 75. (a) step 1 (b) step three (c) dos (d) cuatro Respond to: (b) step three Services: pH = – diary [H + ] [H + ] = 10 -step 3 pH = diary 1 – record [H + ] = log step 1 – log ten -3 https://datingranking.net/escort-directory/palmdale/ = 3

Concern 76. The unit out of ionic equipment out-of drinking water K is actually …………… (a) mol -step 1 L -1 (b) mol -dos L -2 (c) mol -dos L -step 1 (d) mol dos 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 following the ‘s the weakest acidic?

Matter 81. (a) HF (b) HCI (c) HBr (d) Hey Address: (a) HF Clue: HF does not give 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.

Concern 84. What type of one’s pursuing the is named amphoteric solvent? (a) Ammonium hydroxide (b) Chloroform (c) Benzene (d) Liquid Address: (d) Liquid Clue:

Question 85. Which of the following is non – electrolyte? (a) NaCl (b) CaCl₂ (c) C_twelveH_{twenty two}O_eleven (d) CH₃COOH Hint: C₁₂H₂₂O₁₁ is a sugar and non-electrolyte.

An acidic HA ionises as the HA \(\rightleftharpoons\) H + + An effective – This new pH of 1

Concern 86. During the unlimited dilution, the percentage ionisation both for strong and you may weak electrolyte is …………. (a) 1% (b) 20% (c) 50% (d) 100% Answer: (d) 100% Hint: According to Ostwald’s dilution legislation, level of ionisation try in person proportional for the dilution.

Question 87. 0 Yards solution is 5. its dissociation ongoing was ………….. (a) step one x 10 -5 (b) step one x ten -ten (c) 5 (d) 5 x 10 8 Address: (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 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