pH= - log [H+]pH= 3The concentration of [H+] = 1 × 10-3 MpH= 4The concentration of [H+] = 1 × 10-4 MAs per volumetric principle,V1M1 + V2M2 = V3M31000 × 1 × 10-3 +1000 × 1 × 10-4 = 2000 × M3M3 = 1 12000 = 5 5× 10-4pH= - log [H+] = - log 5 5× 10-4 = 4 - log 5 5 = 4-0 7403 = 3 26 Option D is correct

Q24

Q24 and are related as moles of phosphorus pentachloride were taken in a closed vessel and i and chlorine. At equilibrium, the total number of moles Of the (C) 0.15 Aqueous solutions A, B and C are prepared by adding NaCl, NaOH and to (A) increase in A and decrease in B and C (B) increase in B and decrease in A and C (C) increase in C and decrease in A and B remains the same in all the three 22. 1 M NaCl and I M HCI are present in an aqueous solution. The solution is ot a buffer, pH < 7 (C) a buffer, pH > 7 (B) not a buffer, pH > 7 (D) a buffer, pH < 7 23. With increase in temperature, ionic product of water (B) decreases ) increases (D) may increase or decrease (C) remains unaffected 24. Equal volumes of two solutions of pH 3 and 4 are mixed. the pH Of the resulting solution will be (D) 3.26 (C) 2.96 (B) 3.5 25. The pH ofa 10-8 M solution ofHCl in water is /(f)) between 6 and (C) between 7 and 8 water. Which of the following occurs? Ifpressure is increased on the equilibrium Ice

p H = - \log [H^{+}] p H = 3 T h e c o n c e n t r a t i o n o f [H^{+}] = 1 \times 10^{- 3} M p H = 4 T h e c o n c e n t r a t i o n o f [H^{+}] = 1 \times 10^{- 4} M A s p e r v o l u m e t r i c p r i n c i p l e, V_{1} M_{1} + V_{2} M_{2} = V_{3} M_{3} 1000 \times 1 \times 10^{- 3} + 1000 \times 1 \times 10^{- 4} = 2000 \times M_{3} M_{3} = \frac{1.1}{2000} = 5.5 \times 10^{- 4} p H = - \log [H^{+}] = - \log 5.5 \times 10^{- 4} = 4 - \log 5.5 = 4 - 0.7403 = 3.26

Option D is correct

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