Question 51. The degree of ionisation in water will be ……………. (a) 8 x 10 -7 (b) 0.8 x 10 -9 (c) 3.6 x 10 -7 (d) 3.6 x 10 -9 Answer: (a) 8 x 10 -7 Solution: 1 litre of water contains mole. So, degree of ionisation = \(\frac <10^<-7>\times 18><1000>\) = 1.8 x 10 -7

COOH services?

Question 52. If the solubility product of lead iodide (PbI₂) is 3.2 x 10 -8 . Then its solubility in moles/litre will be …………. (a) 2 x 10 -3 . (b) cuatro x 10 -4 (c) 1.6 x 10 -5 (d) 1.8 x 10 -5 Solution: K_sp = 4s 3 4s 3 = 3.2 x 10 -8 s = 2 x 10 -3 M

Concern 54

Question 53. The pH of a soft drink is 3.82. It’s hydrogen ion concentration will be …………… (a) 1.96 x 10 -2 mol / L (b) 1.96 x 1o -3 mol / L (c) 1.5 x 10 -4 mol / L (d) 1.96 x 10 -1 mol / L Answer: (c) 1.5 x 10 -4 mol / L Solution: pH = 3.82 = – log₁₀[H + ] ? [H + ] = 1.5 x 10 -4 mol / litre

The pH of a solution at 25°C containing 0.10 M sodium acetate and 0.03 M acetic acid is ………….. (pK_a for CH₃COOH = 4.57) (a) 4.09 (b) 5.09 (c) 6.10 (d) 7.09 Answer: (b) 5.09 Solution: pH = pK_a + log \(\frac < [salt]>< [acid]>\) = 4.57 + log \(\frac < 0.10>< 0.03>\) = 5.09

Question 55. A weak acid is 0.1% ionised in 0.1 M solution. Its pH is ………….. (a) 2 (b) 3 (c) 4 (d) 1 Answer: (c) 4 Solution: For a monobasic acid [H + ] = c.? = \(\frac < 1>< 2>\) x 0.001 = 10 -4 pH = – log₁₀[10 -4 ] = 4

Question 56. Which one of the following is not a buffer solution? (a) 0.8 M H₂S + 0.8 M KHS. (b) 2 M C₆H₅NH₂ + 2 M C₆H₅N (c) 3 M H₂CO₃ + 3 M KHCO₃ (d) 0.05 M KCIO₄ + 0.05 M HCIO Answer: (d) 0.05 M KCIO₄ + 0.05 M HCIO Hint. HClO₄ is a strong acid while buffer is a mixture of weak acid and its salt. Continue reading “You to litre regarding water consists of ten mol hydrogen ions”

Estimates. The world is stuffed with her or him! Everybody has something to say, and sometimes, what they have to express has the potential to build an affect another person’s life.

It may be governmental. It could be things in the friendship. It may be from the like, and it would-be from the life. Certain tends to be confident, other people might be bad. Specific could make you feel the person stating new estimate was talking with your really. Often, you might plus see quotes that you would disagree which have.

No matter how good quote’s impression could be you, there is no doubt that they have an excellent kind of feeling inside your life. How do inspirational quotes really make a difference?

They can make you another angle.

It might seem during the yet another styles before encountering a great certain inspirational offer. Nevertheless when your pay attention to they otherwise read it someplace, it has the potential to change the manner in which you imagine. Specific estimates is actually effective adequate to change your existence in the a keen immediate. Grab such times. As soon as a bid tends to make an effect on lifetime, make sure to don’t forget it.

They’re able to be your race cry.

What is a fight cry? It’s something provides you with energy in a situation away from biggest challenges. It is something that you holds on to and in case you’re on the latest verge out-of stopping. It’s this thing that you can state out loud for every single go out something or someone is problematic the ability to do just about anything.

They could make it easier to help others.

Men and women have probably approached you to have pointers several times before. You really have offered them some understanding in the whichever it is they’re going through. Continue reading “forty Motivational Rates Throughout the Lifestyle and Love”