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MDCAT Chemistry Chapter 20 Macromolecules Online Test MCQs With Answers
Question # 1
The pH of ideal buffer is
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10
7
Less than 7
0
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Question # 2
At equilibrium, the concentration of reactants and products are
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Constant
Maximum
Different
Equal
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Question # 3
Which Henderson equation is not correct?
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pH= pKa +log [ salt/acid]
pH = pKa - log [ salt/acid ]
pH= pKa - log[ acid/salt ]
Pka = pH - log [ salt/acid ]
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Question # 4
If Kc value is small then equilibrium position will shift
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Towards left
Remains unchanged
Towards right
lt is always constant value
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Question # 5
In the reaction A2 (g) + 4B2 (g) <-----------> 2AB4 (g) such that ∆H < 0, the formation of AB4(g) will be favoured at
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Low temperature and high pressure
Low temperature and low pressure
High temperature and low pressure
High temperature and high pressure
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Question # 6
Which one is correct about conjugate acid-base concept?
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Conjugate base of a very weak acid is relatively very strong
Conjugate base of a very weak acid is relatively very weak
Conjugate base of a very strong acid is relatively very weak
Both A and C
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Question # 7
The decomposition of N2O4 to NO2 is carried out at 280°C in chloroform. When quilibrium is reached. 0.2 moles of N2O4 and 0.02 mole of NO2 are present in 1:1 ratio The equilibrium constant for the reaction N2O4------> 2NO2 is
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0.01
0.001
0.02
0.002
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Question # 8
Which one increases by common ion effect except?
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Crystallization
Solubility
Association of ions
All of these
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Question # 9
The solubility product of AgCl is
2.0 x 10(-10) mol2 dm(-6). The maximum concentration Ag+ ions in the solution is:
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1.41 × 10(-5) mol. dm(-3)
1.41 × 10(-10) mol. dm(-3)
2.0 × 10(-10) mol. dm(-3)
4.0 × 10(-20) mol. dm(-3)
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Question # 10
In a saturated solution of AgCl, the molar concentration of Ag+ and Cl- is 1.0x10(-5)M each. What is the value of Ksp
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1.0x10(-5)
1.0x10(-15)
0.1x10(-5)
1.0x10(-10)
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Question # 11
The value of Kc for H2O at 25C° is
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1x10 (-14)mole dm-3
14 mol dm-3
1.86×10(-16) mol dm-3
1.0x10 (-7)moldm-3
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Question # 12
What will be the pH of 1.0 mol dm-3 of NH4OH, which is 1% dissociated
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2
12
0
2.7
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