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CBSE Questions for Class 11 Medical Chemistry Equilibrium Quiz 5 - MCQExams.com

Calculate : Ka for HCN given Kb(CN)=2.5×105
  • 105
  • 2×107
  • 4×1010
  • None of these
Assertion: The value of Kw increases with increase in temperature.
Reason: Water dissociates more as temperature increases.
  • Both Assertion and Reason are true and Reason is the correct explanation of Assertion
  • Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
  • Assertion is true but Reason is false
  • Assertion is false but Reason is true
  • Both Assertion and Reason are false
Calculate change in concentration of H+ ion in one litre of water,when temperature changes from 298K to 310K. [Given Kw(298)=1014,Kw(310)=2.56×1014].
  • 0.3×107
  • 0.6×107
  • 1.2×107
  • 12×109
What is the Kb for NH2 group in glycine?
  • 4×103
  • 1.6×1010
  • 6.25×105
  • 2.5×1012
Assertion: The buffer HCOOH/HCOONa will have pH lesser than 7.
Reason: Conjugate base of a weak acid is a strong base.
  • Both Assertion and Reason are true and Reason is the correct explanation of Assertion
  • Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
  • Assertion is true but Reason is false
  • Assertion is false but Reason is true
  • Both Assertion and Reason are false
An equimolar solution of NaNO2 and HNO2 can act as a:
  • strong reductant
  • strong oxidant
  • buffer solution
  • none of these
The ionization constant of water is related to ionic product as: 
  • kw>k[H2O]
  • kw=k[H2O]
  • kw<[H2O]
  • none of the above
If Ka for an acid, HA is 1×106, then Kb for A would be:
  • 109
  • 105
  • 108
  • 103
Sulphurous acid turns ________.
  • blue litmus into red
  • red litmus into blue
  • no change to any of the litmus paper
  • can't say
The following equilibrium is established when hydrogen chloride is dissolved in acetic acid. 

HCl(aq)+CH3COOH(aq)Cl(aq)+CH3COOH2(aq)

The set that characterizes the conjugate acid-base pairs is
  • (HCl,CH3COOH)and(CH3COOH2,Cl)
  • (HCl,CH3COOH2)and(CH3COOH,Cl)
  • (CH2COOH2,HCl)and(Cl,CH3COOH)
  • (HCl,Cl)and(CH3COO,CH3COOH)
The chemical that changes its colour when it is left open in sunlight is:
  • FeSO4(s)
  • Pb(NO3)2(s)
  • AgCl(s)
  • BaCl2(aq)
_____ of acids are lower than that of bases.
  • log[H+]
  • pOH
  • [H+]
  • pH
Which of the following statements is correct for a solution saturated with AgCI and AgBr if their solubilities in moles per litre in separate solutions are x and y respectively?
  • [Ag+]=x+y
  • [Ag+]=[Br]+[Cl]
  • [Br]=y
  • [Cl]>x
Study the table carefully. Which of the above are correctly matched?

318551_2c2517925d89410f837a88e137348d8c.png
  • (i) & (iii)
  • (ii) & (iv)
  • (i), (ii) & (iii)
  • (i), (iii) & (iv)
Which of the following is correct regarding buffer solution?
  • It contains weak acid and its conjugate base.
  • It shows low change in pH on adding small amount of acid or base.
  • (A) and (B) both
  • None of these
Which of the following salts on heating gives a mixture of two gases?
  • Ba(NO3)2
  • NaNO3
  • KNO3
  • RbNO3
0.5 mmol of NaCN and 1 mmol of HCl in 1 L solution is a buffer.
  • True
  • False
State whether the given statement is true or false:

AgCl is less soluble in aqueous sodium chloride solution than in pure water.
  • True
  • False
Neutralization always produces a solution of pH=7.
  • True
  • False
When hydrated MgCl2.6H2O is strongly heated:
  • MgO is formed
  • Mg(OH)2 is formed
  • Mg(OH)Cl is formed
  • Ahydrous MgCl2 is formed
The dissociation constant of acetic acid at a given temperature is 1.69×105. The degree of dissociation of 0.01 M acetic acid in the presence of 0.01 M HCl is equal to:
  • 0.41
  • 0.13
  • 1.69×103
  • 0.013
What are the products formed when an aqueous solution of magnesium bicarbonate is boiled?
  • MgCO3,H2O,CO2
  • Mg(HCO3)2,H2O
  • Mg(OH)2,H2O
  • Mg,CO2,H2O
A mixture of aqueous solution of sodium acetate and sodium propanoate forms a buffer solution.
  • True
  • False
If we create vacuum in container A at 25C then:
332897_c38626fc2f6749cabc21636d4587eae9.png
  • water will be completely vaporised in the container
  • there will be no vaporisation in the container
  • the equilibrium will establish in between water vapour and liquid H2O and vapour pressure of water will remain same as it would be in presence of atmospheric pressure
  • the equilibrium in between H2O(v) and H2O(l) will establish but vapour pressure of H2O(v) will be more than as it would be in presence of atmospheric pressure
Which of the following can give a buffer solution?
  • HCI+NaOH
  • CH3COONa
  • HCOOH+HCOONa
  • H2SO4+Na2SO4

Which of the following properties of a solution of NaCl will not vary as the concentration of salt is increased?
  • pH
  • Density
  • Refractive index
  • Electrical conductivity
Which of the following statement is correct regarding container B?
332898_c2f67646498c4e4a9dcf65bef37c570b.png
  • Water will migrate from Glass (i) to Glass (ii) and no equilibrium will establish
  • Water will migrate from Glass (i) to Glass (ii) and equilibrium will establish after some time
  • Water will not migrate to any side
  • None of these
Which of the following is/are correct when some HCl is added to pure water? [Temperature is constant]
  • Kw decreases
  • Degree of dissociation of water decrease
  • At new equilibrium [H+]total>[OH]total
  • Solution remains neutral
Which of the following acids has the smallest dissociation constant?
  • CH3CHFCOOH
  • FCH2CH2COOH
  • BrCH2CH2COOH
  • CH3CHBrCOOH
The constituent present in baking powder is:
  • Sodium benzoate
  • Acetic acid
  • Sodium lactate
  • Tartaric acid
Fill in the blanks with suitable words:

Excessive use of fertilizers makes the soil ______ so it should be treated with ______ like ________. If the soil is ____ then the organic matter should be added to it.
  • basic, acids, formic acid, acidic
  • basic, acids, milk of magnesia, neutral
  • acidic, bases, zinc carbonate, neutral
  • acidic, bases, slaked lime, basic
Which property is common between vinegar and curd?
  • Sweet taste
  • Bitter taste
  • Tasteless
  • Sour taste
A solution of ferric chloride in water is acidic to litmus due to:
  • hydrolysis
  • decomposition
  • electrolysis
  • condensation
Identify the correct option amongst the following:
Electropositive atoms tend to form :
  • negative ions
  • positive ions
  • covalent bonds
  • metallic bonds
Which one of the following substance will be most suitable for cutting a very hard material?
  • Silicon carbide
  • Lead
  • Zinc metal
  • Sodium chloride crystal
Arrange the following in order of increasing pH?
  • Water < Blood < Soda water
  • Water < Soda water < Blood
  • Soda water < Water < Blood
  • Soda water < Blood < Water
The function of 'buffer solution' is:
  • to increase the pH value in chemical reaction
  • to decrease the pH value on chemical reaction
  • to increase or decrease the pH value of according the need
  • to keep the pH value constante in chemical reaction
Which one of the following statements is true?
  • All alkalis are bases
  • Rusting is a combination of iron with oxygen dissolved in water
  • Heavy water accelerates the growth of living organisms, plants and animals
  • Sodium carbonate is used as a baking powder
If a salt after rubbing with fingers gives the smell of ammonia, then the salt is:
  • ammonium chloride
  • sodium carbonate
  • calcium carbonate
  • lead sulphide
Which of the  following methods is not used for preparing a salt?
  • Reaction between an acid and a base
  • Action of acid on metals
  • Action of acid on metal oxides
  • Dissolution of acids in water
pH of tomato juice is 4, that means it is:
  • basic
  • acidic
  • neutral
  • none of these
The original colour of a salt is black. When it is heated its colour is changed from black to red. The salt may be:
  • zinc oxide
  • mercuric oxide
  • lead oxide
  • red lead
A solution of sodium chloride will:
  • turn red litmus blue
  • turn blue litmus red
  • turn red litmus orange
  • not change the colour of either red or blue litmus
pKb of NH3 is 4.74 and pKb of A,B and C are 1, 5 and 6 respectively, aqueous solution of 0.01 M has pH in the increasing order:
  • NH4A<NH4B<NH4C
  • NH4C<NH4B<NH4A
  • NH4C<NH4A<NH4B
  • All have equal pH
Acetic acid is used for preservation of foods.
  • True
  • False
Sea water contains about 24g of salts dissolved per litre of it.
  • True
  • False
What could be the nature of aqueous solution of sodium sulphate?
  • Acidic
  • Basic
  • Neutral
  • Nature depends on the concentration of the solution
Which of the following ions is furnished by acids in aqueous solution?
  • OH ions
  • H+ ions
  • H3O+ ions
  • None of these
The acid present in tea is:
  • citric
  • tannic
  • formic
  • lactic
The loss of water of crystallization to the atmosphere by a compound is termed:
  • deliquescence
  • dehydration
  • efflorescence
  • hydrolysis
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