Chapter 7
EQUILIBRIUM
1. The acid that results when a base accepts proton is called
Ans:- conjugate acid of the base
2. Which one of the following has pH value of 10.5?
a. Lime water
b. Soft drink
c. Blood
d. Milk
Ans:- lime water
3. According to Lewis concept an acid is an electron pair donor. State whether this statement true or False
Ans:- False, according to Lewis concept an acid is an electron pair acceptor
4. Which of the following will favor the reverse reaction in a chemical equilibrium
a. Increas in the concentration of one or more of the product
b. increase in presser
c. Decreas in the pressure
Ans:- a
5. 1 l of water, 10^ -3 mol of Hcl is added The pH of the solution is
Ans:- 7
6. Observe the relationship between the first two terms and filling the blanks
CH3COONa: alkaline ,pH >7
NaNO3: ...............
Ans:- neutral pH = 7
7. Choose the correct pair
Liquid vapour : melting
Solid liquid : boiling point
Solid vapours: sublimation point
Ans:- solid vapours : sublimation point
8. Which of the following statement regarding a catalyst in a equilibrium presses is currect ?
a. Increase the forword reaction
b. Increase the backward reaction
c. It hastens the easy attainment of equilibrium
Ans:- c
9. The ph of neutral water is 6.5. Then temperature of the water is
Ans:- more than 25°c
10. The aqueous solution of HCOONa,C6H5NH3Cl and kCN are respectively
Ans:- basic, acids,basic
11.The blue litmus paper dipped into a aqueous solution of NH4NO3 . Is there any colour change .substantiate your answer
Ans:- yes blue litmus paper changes to red
NH4NO3 is a salt formed from a weak base and a strong acid so on hydrolysis gives an acidic solution
12. To a basic buffer solution 3 drops of 0.1 M Hcl solution is added .still its pH remain
Same for the observation
Ans:- Buffer is a solution which resists change in pH by the addition of small amount of acid or base .Here the H+ ion from the acid will be neutralised by the buffer
13. When some sodium acetate is added to a solution of acetic acid .the concentration of unionised acetic acid increases .what is the phenomenon involved have ? substantiate
Ans:- common ion effect. The dessosiation of acetic acid is suppressed by the common ion CH3COO which compines with H to form acetic acid
14. Select the sutable reagent . Prepare the basic buffer and an acidic buffer
NH4Cl,NH4OH,NaOH, NaCl, CH3COOH,CH3COONa
Ans:- Acidic buffer:- CH4COOH+CH3COONa
Basic buffer:- NH4Cl,NH4OH
15. During a class room discussion one your friends argues that ionic product of water is not altered with the change in temperature
What is your view towards this argument .justify
Ans:- The argument is wrong .ionic product of water kw increases with increases in temperature since the dissociation of water is an endothermic process
EQUILIBRIUM
1. The acid that results when a base accepts proton is called
Ans:- conjugate acid of the base
2. Which one of the following has pH value of 10.5?
a. Lime water
b. Soft drink
c. Blood
d. Milk
Ans:- lime water
3. According to Lewis concept an acid is an electron pair donor. State whether this statement true or False
Ans:- False, according to Lewis concept an acid is an electron pair acceptor
4. Which of the following will favor the reverse reaction in a chemical equilibrium
a. Increas in the concentration of one or more of the product
b. increase in presser
c. Decreas in the pressure
Ans:- a
5. 1 l of water, 10^ -3 mol of Hcl is added The pH of the solution is
Ans:- 7
6. Observe the relationship between the first two terms and filling the blanks
CH3COONa: alkaline ,pH >7
NaNO3: ...............
Ans:- neutral pH = 7
7. Choose the correct pair
Liquid vapour : melting
Solid liquid : boiling point
Solid vapours: sublimation point
Ans:- solid vapours : sublimation point
8. Which of the following statement regarding a catalyst in a equilibrium presses is currect ?
a. Increase the forword reaction
b. Increase the backward reaction
c. It hastens the easy attainment of equilibrium
Ans:- c
9. The ph of neutral water is 6.5. Then temperature of the water is
Ans:- more than 25°c
10. The aqueous solution of HCOONa,C6H5NH3Cl and kCN are respectively
Ans:- basic, acids,basic
11.The blue litmus paper dipped into a aqueous solution of NH4NO3 . Is there any colour change .substantiate your answer
Ans:- yes blue litmus paper changes to red
NH4NO3 is a salt formed from a weak base and a strong acid so on hydrolysis gives an acidic solution
12. To a basic buffer solution 3 drops of 0.1 M Hcl solution is added .still its pH remain
Same for the observation
Ans:- Buffer is a solution which resists change in pH by the addition of small amount of acid or base .Here the H+ ion from the acid will be neutralised by the buffer
13. When some sodium acetate is added to a solution of acetic acid .the concentration of unionised acetic acid increases .what is the phenomenon involved have ? substantiate
Ans:- common ion effect. The dessosiation of acetic acid is suppressed by the common ion CH3COO which compines with H to form acetic acid
14. Select the sutable reagent . Prepare the basic buffer and an acidic buffer
NH4Cl,NH4OH,NaOH, NaCl, CH3COOH,CH3COONa
Ans:- Acidic buffer:- CH4COOH+CH3COONa
Basic buffer:- NH4Cl,NH4OH
15. During a class room discussion one your friends argues that ionic product of water is not altered with the change in temperature
What is your view towards this argument .justify
Ans:- The argument is wrong .ionic product of water kw increases with increases in temperature since the dissociation of water is an endothermic process
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