CBSE
Multiple Choice QuestionsA buffer solution contains 500 mL of 0.2 M CH3COONa and 500 ml of 0.1 M CH3COOH .1 L of water is added to this buffer , pH before and after dilution will be (pka of CH3COOH = 4.74)
3.74
5.04
5.90
7.70
Assertion : In an acid-base titration involving strong base and a weak acid, methyl orange can be used as an indicator.
Reason : Methyl orange changes its colour in pH range of 7 to 9.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Hydrofluoric acid is a weak acid. At 25°C, the molar conductivity of 0.002 M HF is 176.2 cm2 mol-1. If its = 405.2 cm2 mol-1. Equilibrium constant at the given concentration is
6.7 10-4 M
3.2 10-4 M
6.7 10-5 M
3.2 10-5 M
Assertion : Ice water, if pressure is applied water will evaporate.
Reason : Increases of pressure pushes the equilibrium towards the side in which number of gaseous molecule increases.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Assertion : Heat of neutralisation of nitric acid with NaOH is same to that of HCI and NaOH.
Reason : In both cases strong acid and strong bases are neutralised.
H+ + OH- H2O
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
The equilibrium constant for mutarotation -D Glucose -D Glucose is 1.8. What percentage of form remains at equilibrium?
35.7
64.3
55.6
44.4
The pH of a 0.02 M solution of HCl is :
2.2
2.0
0.3
1.7
A vessel of one litre capacity containing 1 mole of SO3 is heated till a state of equilibrium is attained.
2SO3 (g) 2SO2 (g) + O2 (g)
At equilibrium, 0.6 moles of SO2 had formed. The value of equilibrium constant is
0.18
0.36
0.45
0.68
The solubility product of Mg(OH)2 at 25°C is 1.4 x 10-11 .What is the solubility of Mg(OH)2 in g/L ?
0.0047 g/L
0.047 g/L
0.0087 g/L
0.087 g/L
The conjugate base of (CH3)2NH2+ is :
(CH3)3N
(CH3)2NH
(CH3)2N-
(CH3)2N+
