The fresh new pH out of millimolar HCl is …………

The fresh new pH out of millimolar HCl is …………

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

Concern 76. These devices away from ionic product out-of liquids K was …………… (a) mol -1 L -step 1 (b) mol -dos L -2 (c) mol -2 L -step one (d) mol 2 L -dos Respond to: (d) mol 2 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 female escort New Haven CT 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 following the ‘s the weakest acidic?

Matter 81. (a) HF (b) HCI (c) HBr (d) Hi Answer: (a) HF Clue: HF will not provide proton without difficulty.

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 one’s after the is named amphoteric solvent? (a) Ammonium hydroxide (b) Chloroform (c) Benzene (d) Water Address: (d) Liquids Idea:

Question 85. Which of the following is non – electrolyte? (a) NaCl (b) CaCl2 (c) Ca dozenH22O11 (d) CH3COOH Hint: C12H22O11 is a sugar and non-electrolyte.

An acidic HA ionises because HA \(\rightleftharpoons\) H + + Good – The brand new pH of 1

Concern 86. During the infinite dilution, new fee ionisation both for solid and you may weak electrolyte is …………. (a) 1% (b) 20% (c) 50% (d) 100% Answer: (d) 100% Hint: Considering Ostwald’s dilution legislation, degree of ionisation are individually proportional for the dilution.

Question 87. 0 Yards solution is 5. the dissociation lingering might be ………….. (a) step 1 x 10 -5 (b) 1 x 10 -10 (c) 5 (d) 5 x ten 8 Respond to: (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 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