CHEMICAL AND IONIC EQUILIBRIA
Which statement is not true regarding Lewis acids and bases?
- Lewis base must contain an atom having less than an octet of electron
- Substances which donate a pair of electrons are called Lewis bases
- All Lewis bases are also Bronsted bases
- NH3 and H2O both behaves as Lewis bases
Lewis base must contain an atom having less than an octet of electron
At equilibrium the free energy change (ΔF) for a reaction is
- Zero
- Minimum
- Maximum
- Infinite
Zero
Which properties of a system does not change in a state of equilibrium?
- Concentration
- Density
- Pressure
- All of A, B, and C
All of A, B, and C
In the equilibrium reaction N2 + 3H2 ⇄ 2NH3 + 22.9kcal, the equilibrium shifts to the forward direction when ________ .
- Increasing the P as well as T
- Decreasing the P as well as T
- Increasing the P and decreasing the T
- Decreasing the P and increasing the T
Increasing the P as well as T
According to Le-Chatlier’s principle, the formation of NO2 at equilibrium in the reaction should be helped by 2NO + O2 ⇄ 2NOâ‚‚+ heat
- Low T, high P
- Low T and low P
- High T and high P
- High temperature
Low T, high P
Formation of SO3 takes place according to the following reaction 2SO2 + O2 ⇄ 2SO3 ΔH = -45.2 kcal. Which factors will help the formation of SO3?
- Increase of T
- Removal of O2
- Increase of P
- Increase of volume
Increase of P
For Which equilibrium does decrease in pressure not help the forward reaction?
- CaCO3 ⇄ CaO + CO2
- 2NH3 ⇄ N2 + 3H2
- NH4Cl ⇄ NH3 + HCl
- CO + 2H2 ⇄ CH3OH
CO + 2H2 ⇄ CH3OH
Four moles of A are mixed with four moles of B when 2 moles of Care formed at equilibrium, according to the reaction A+B ⇄ C + D. What is the value of the equilibrium constant?
A 2/2
- 8
- 1
- 1/4
1/4
When 3 moles of ethyl alcohol are mixed with 3 mole of acetic acid. 2 moles of ester are formed at equilibrium according to the equation CH3COOH + C2H5H ⇄ CH3COOC2H5 + H₂O. What is the value of the equilibrium constant for the reaction?
- 4
- 4/9
- 2
- 3/9
4/9
In the reaction HCN + H2O ⇄ H3O + CN. The conjugate acid-base pair is
- HCN, H3O+
- – HCN, CN
- CN-, H3O+
- – H2O, CN
HCN, CN
According to Arrhenius theory, an acid is defined as substance which
- Furnishes H2O+ ion in water
- Donates H+ ion in ammonia
- Contains CI– ions
- Accepts an electron pair
Furnishes H2O+ ion in water
Which can act both as a Bronsted acid and a Bronsted base?
- Na2CO3
- HCO3
- OH
- NH3
HCO3
Which is not a Lewis base?
- CN
- NH3
- ROH
D AICI3
AICI3
Which statement is not related with chemical equilibrium?
- The chemical equilibrium is static in nature
- The equilibrium can be approached from either direction
- The chemical equilibrium is dynamic in nature
- The properties of the system become constant
The chemical equilibrium is static in nature
HS is a conjugate base of
- S2
- Hâ‚‚SO4
- Hâ‚‚SO3
- H2S
H2S
Which acid-base reaction is according to Lewis classification?
- H+ + OH ⇄ H2O
- HCN H2O ⇄ H3O + CN
- H₂O + H2O ⇄ H3O+ OH
- (CH3)3N+BF3 ⇄ (CH3) 3N: BF3
(CH3)3N+BF3 ⇄ (CH3) 3N: BF3
The sum of pH and pOH in aqueous solution is equal to the
- 14
- 7
- pKw
- Zero
14
The value of Kw at 25°C
- 14
- 1.4
- 0.14
- 1× 10-14
1× 10-14
Which solution has pH = 11?
- 1x 10-3 M NaOH
- 1 x 10-11 M HCI
- 1x 10-11 M NaOH
- 1x 103 M NaOH
1x 10-3 M NaOH
What is the pKa of an acid having ionization constant 1 x 10-5?
- -3
- -9
- 9
- 5
5
Which will have the higher pH?
- 0.1 N NaOH
- 0.1 N CH3COOH
- 0.1 N HCI
- 0.01 N HCI
0.1 N NaOH
The pink colour of phenolphthalein in basic medium is due to the
- Cationic form
- OH ions of the base
- Neutral form
- anionic form
anionic form
A buffer solution can be prepared from a
- CH3COOH and CH3COONa
- CH3COOH and HCI
- CH3COOH and NaOH
- CH3COONa and HCI
CH3COOH and CH3COONa
The true order of increasing acid strength is
- HNO4 < Hâ‚‚Nâ‚‚Oâ‚‚ < HNOâ‚‚
- Hâ‚‚Nâ‚‚Oâ‚‚ < HNO3 < HNOâ‚‚
- HNOâ‚‚ < HNO3 < Hâ‚‚Nâ‚‚Oâ‚‚
- Hâ‚‚Nâ‚‚Oâ‚‚ < HNOâ‚‚ < HNO3
Hâ‚‚Nâ‚‚Oâ‚‚ < HNOâ‚‚ < HNO3
The true order of acidic strength is
- HF < HCI < HBr < HI
- HI < HBr < HCI < HF
- HI < HBr < HF < HCl
- HF < HCI < HI < HBr
HF < HCI < HBr < HI
What is the true order of acid strength?
- HIO1 > HBrO1 > HCIO1
- HBrO1 > HCIO1 > HIO1
- HBro1 > HIO1 > HCIO1
- HCIO1 > HBrO1 > HIO1
HCIO1 > HBrO1 > HIO1
Which specie is a stronger acid than formic acid, HCOOH in aqueous solution?
- H2SO4
- NH4
- CH3COOH
- H4P2O7
H2SO4
The degree of dissociation of weak acid increases with
- Decreasing concentration
- Increasing pressure
- Increasing concentration
- Decreasing pressure
Decreasing concentration
A 2M solution of H2SO4 would have how many moles of H ion in one liter?
- 1.0
- 4.0
- 7.0
- 2.0
4.0
Which hypothetical reaction is helped by increase of temperature and pressure?
- 2A + B ⇄ C + D ΔH = +ve
- A + 2B ⇄ 2C+D ΔH = +ve
- A + B ⇄ C+D ΔH = -ve
- 2A+2B ⇄ 2C + 2D ΔH = -ve
2A + B ⇄ C + D ΔH = +ve
What is the pH of a neutral solution at 100°C when Kw = 1.0 x 10-12?
- 6
- 4
- 0
- 2
6
The pKa of acetic acid is 4.74, which implies that _____ .
- pH of 1N solution is 4.74
- At pH 4.74, the dissociation of acetic acid is minimum
- At pH 4.74, the dissociation of acetic acid is maximum
- At pH 4.74, half of the acetic acid molecules are dissociated in the solution
At pH 4.74, half of the acetic acid molecules are dissociated in the solution
Which is a buffer solution?
- CH3COOH + CH3COONa
- CH3COOH + HCI
- CH3COOH + NaOH
- CH3COOH + NH4OH
CH3COOH + CH3COONa
Which is not a buffer?
- Hâ‚‚CO/HCO3
- NH4OH/CH3COOH
- CH3COOH/CH3COONa
- NH4CH/NH4CH
NH4OH/CH3COOH
Which parameter of a chemical reaction will change with the use of a catalyst?
- K, the rate constant
- ΔS, change in entropy
- ΔE, change in internal energy
- ΔP, change in free energy
K, the rate constant
What is the approximate pH of human blood?
- 7.5
- 6.2
- 7.8
- 7.2
7.2
Azeotropic mixture can be separated by which of the following?
- Vacuum distillation
- Fractional distillation
- Simple distillation
- Destructive distillation
Vacuum distillation
Which has highest pH?
- 0.1 M HCI
- 0.2 M HCI
- 0.1 M HNO3
- 0.1 M NaOH
0.1 M NaOH
If 20 ml of 0.5 N salt solution is diluted to one litre, what is the new concentration?
- 1N
- 0.00 1N
- 0.01 N
- 10 N
0.01 N
The pH of milk is
- 5.5
- 8.5
- 7.5
- 6.5
6.5
What is the pH of soft drink?
- 2
- 6
- 5
- 3
3
What is the sum of [H+] and [OH–] in pure water?
- 7
- 14
- 20
- 12
14
Which affect the Kc value?
- Catalyst
- Pressure
- Temperature
- All of A, B, and C
Temperature
What is the pH of 0.001 M HCl in water?
- 5
- 3
- 2
- 4
3
What is the pH of 0.001 M NaOH?
- 14.
- 11
- 13
- 12
11
What is the molarity of pure water?
- 7 M
- 18 M
- 55.5 M
- 14 M
55.5 M
The precipitation occurs if the ionic concentration is:
- More than Ksp
- Less than Ksp
- Equal to ksp
- None of A, B, and C
More than Ksp
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