CHEMICAL EQUILIBRIUM QUIZ-9

CHEMISTRY CHEMICAL EQUILBRIUM QUIZ-9

Dear Readers,

The one subject in NEET which is candidates who can easily attain good marks is Chemistry. That's the reason, often, one doesn’t pay notice and choose to compromise it. But if one wants to rank above others, the tip is to be thorough with NEET chemistry concepts. The understanding of reactions and definite basic understanding is what requires major attention in Chemistry but once done it only gets simpler from there. The main focus on the to-do list should be on getting a hang of the NCERT syllabus of NEET chemistry.

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Q1. Which equilibrium in gaseous phase would be unaffected by an increase in pressure?

•  N₂O₄⇌2NO₂
•  N₂+O₂⇌2NO
•   N₂+3H₂ ⇌2NH₃
•  CO + 1/2 O₂ ⇌CO₂

Solution
b)

Q2.Equivalent amounts of H₂ and I₂ are heated in a closed vessel till equilibrium is obtained. If 80% of the hydrogen can be
converted to H,the K_c at this temperature is

•  64
•  16
•  0.25
•  4

Solution
(a)

Q3.  For the reaction,
CuSO₄∙5H₂O(s)⇌CuSO₄∙3H₂O(s)+2H₂O(v) which one is correct representation?

•  K_p=(P_{(H2O) )}²
•  K_c=[H₂O]²
•  K_p=K_c(RT)²
•  All of these

Solution
d) k>sub>p=(P_(H2O))^2 and K_c=[H₂O]² ; the solid species are not used in writing K_c or K_p

Q4. One mole of nitrogen is mixed with 3 mole of hydrogen in a closed 3 litre vessel. 20% of nitrogen is converted into NH₃.Then K_c for the 1/2 N₂ +3/2 H₂⇌NH₃ is:

•  0.36 litre mol^-1
•  0.46 litre mol^-1
•  0.5 litre mol^-1
•  0.2 litre mol^-1

Solution
a)

Q5.How many mole of HCl are required to prepare one litre of buffer solution (containing NaCN+HCl) of pH 8.5 using 0.01 g formula weight of NaCN (K_HCN=4.1×10^-10)?

•  8.85×10^-3
•  8.75×10^-2
•  8.85×10^-4
•  8.85×10^-2

Solution
 a)

Q6.Salting out action of soap is based on:

•  Complex ion formation
•  Common ion effect
•  Solubility product
•  Acid-base neutralization

Solution
c) To precipitate soap from its saturated solution on addition of salt is called salting out action of soap. RCOONa⇌RCOO^-+Na⁺ K_sp=[RCOO^-][Na⁺] In presence of NaCl,[Na⁺] increases and thus, the product of [Na⁺][RCOO^-] exceeds in K_sp to show precipitation of soap.

Q7.The oxoacid of SO₂ is:

•   H₂SO₃
•  H₂SO₄
•  H₂S₂O₈
•  None of these

Solution
(a) S has +4 ox.no. in H₂SO₃ and SO₂ both

Q8.A white salt is readily soluble in water and gives a colourless solution with a pH of about 9. The salt would be:

•   NH₄NO₃
•  CH₃COONa
•  CH₃COONH₄
•  CaCO₃

Solution
b) Hydrolysis of CH₃COO^- give alkaline solution.

Q9.The expression for the solubility product of Al₂(SO₄ )₃ is

•  K_sp=[Al³⁺] [SO₄^(2-)]
•  K_sp=[Al³⁺)]²[SO₄^(2-)]³
•  K_sp=[Al³⁺]³ [SO₄^2- ]²
•  K_sp=[Al³⁺]²[SO₄^(2-)]²

Solution
b) Al_{2(SO_4)3⇌2Al³⁺+3SO4^2- Ksp=[Al³⁺]² [SO4^2-]³}

Q10. The suitable indicator for the titration of strong acid and weak base is

•  Methyl orange
•  Methyl red
•  Phenol red
•  Phenolphthalein

Solution
a) Such solutions are acidic and methyl orange act on acidic pH

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