brodidit for students
ہوم / مشق / ایم ڈی کیٹ / کیمیا / تیزاب، اساس اور توازن
تیزاب، اساس اور توازن
8 سوالات: ایم ڈی کیٹ کیمیا، جوابات اور وضاحت کے ساتھ۔
-
What is the pH of 0.01 M hydrochloric acid?
- 1 1
- 2 2
- 3 7
- 4 12
-
What is the pH of 0.001 M sodium hydroxide at 25 degrees C?
- 1 3
- 2 10
- 3 11
- 4 13
-
What is the conjugate base of H2SO4?
- 1 SO4 2-
- 2 HSO4-
- 3 H3SO4+
- 4 OH-
جواب دیکھیں
درست جواب: HSO4-
When H2SO4 gives away one proton it becomes HSO4-, which is its conjugate base.
-
For N2 + 3H2 <-> 2NH3, increasing the pressure shifts the equilibrium:
- 1 To the left
- 2 To the right
- 3 It does not change
- 4 Only if a catalyst is added
جواب دیکھیں
درست جواب: To the right
The forward reaction reduces 4 moles of gas to 2 moles. Higher pressure favours the side with fewer gas moles, so it shifts right.
-
A buffer solution is made of:
- 1 A strong acid and a strong base
- 2 A weak acid and its salt
- 3 Two salts of strong acids
- 4 Pure water and a salt
جواب دیکھیں
درست جواب: A weak acid and its salt
A weak acid and its conjugate base resist large changes in pH when small amounts of acid or base are added.
-
What is the pOH of a solution whose pH is 4 at 25 degrees C?
- 1 4
- 2 7
- 3 10
- 4 14
-
Which expression gives the solubility product Ksp of AgCl?
- 1 [AgCl]
- 2 [Ag+] x [Cl-]
- 3 [Ag+] / [Cl-]
- 4 [Ag+] + [Cl-]
جواب دیکھیں
درست جواب: [Ag+] x [Cl-]
For a sparingly soluble salt, Ksp is the product of the ion concentrations at saturation.
-
A larger value of Ka means that the acid is:
- 1 Weaker
- 2 Stronger
- 3 More basic
- 4 Unable to ionise
جواب دیکھیں
درست جواب: Stronger
Ka measures how far an acid ionises. A larger Ka means more ionisation, so a stronger acid.