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p-Block Element...

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  • Question 1
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    Which of the following statement is correct about the hydride of group 16 elements?

  • Question 2
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    The pair that contains mixed oxides is

  • Question 3
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    The acid having a sulp hur atom with a lone pair of electrons on it, is

  • Question 4
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    Charring of cane sugar by sulphuric acid shows ...... property of the acid.

  • Question 5
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    Which of the following statements is incorrect?

  • Question 6
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    xSo2 + yMnO-4 + zH2O → Mn2+ + SO42- + H+ . In this, three values of x, y, z are

  • Question 7
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    Which of the following is wrong statement?

  • Question 8
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    Among the following oxyacids of sulphur, which one has more than one oxidation state for sulphur?

  • Question 9
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    In SO3 molecule, 3 oxygen atoms are attached to sulphur atom through double bonds. Hence, the molecules consist 3π-bonds. The types of pi-bonds present in SO3 molecule are

  • Question 10
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    Which of the following is known as C aro’s acid?

  • Question 11
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    Statement I : In Caro’s acid (H2SO5), the oxidation state of sulphur is found to be +8.

    Statement II : In Caro’s acid, sulphur atom is attached to four oxygen atoms directly.

     

  • Question 12
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    The incorrect statements among the following are

     

  • Question 13
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    The chemical species having sp2-hybridisation for the central atom is

  • Question 14
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    Find the amphoteric oxide

  • Question 15
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    Which pair is isostructural?

     

  • Question 16
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    Direction (Q. Nos. 16 and 17) This section contains a paragraph, describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).

    Passage

    Hydrated sodium thiosulphate, Na2S2O3 .5H2O is called hypo. It can be prepared by Spring’s reaction by adding iodine to a mixture of sodium sulphide and sodium sulphite.

    Na2S + Na2SO3 + I2 → 2NaI + Na2S2O3 (Spring's reaction)
    It is an efflorescent substance and at 215°C, it is completely dehydrated to Na2S2O3. Its reaction with iodine is used fo r the iodometric estimation of oxidising agents like CuSO4, CaOCI2, KMnO4, MnO2, etc., which on reaction with KI liberate I2. It is used in the bleaching industry to destroy excess chlorine on fabrics. It is used in photography as fixer since, it dissolves unexposed AgBr on the film.

    Q. 

    Select the incorrect statement regarding hypo.

  • Question 17
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    Passage

    Hydrated sodium thiosulphate, Na2S2O3 .5H2O is called hypo. It can be prepared by Spring’s reaction by adding iodine to a mixture of sodium sulphide and sodium sulphite.

    Na2S + Na2SO3 + I2 → 2NaI + Na2S2O3 (Spring's reaction)

    It is an efflorescent substance and at 215°C, it is completely dehydrated to Na2S2O3. Its reaction with iodine is used fo r the iodometric estimation of oxidising agents like CuSO4, CaOCI2, KMnO4, MnO2, etc., which on reaction with KI liberate I2. It is used in the bleaching industry to destroy excess chlorine on fabrics. It is used in photography as fixer since, it dissolves unexposed AgBr on the film.

    Q. 

    In Na2S4O6, sulphur has different oxidation states. They are

  • Question 18
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    Direction (Q. Nos. 18-20) Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct.

    Q. 

    Match the Column I with Column II and mark the correct option from the codes given below.

  • Question 19
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    Match the Column I with Column II and mark the correct option from the codes given below.

  • Question 20
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    Match the Column I with Column II and mark the correct option from the codes given below.

  • Question 21
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    Graphite has a structural similarity with

  • Question 22
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    Which is the correct order of decreasing acidity of lewis acids?

  • Question 23
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    In the presence of KF, AlF3 is soluble in HF. Find the complex formed

  • Question 24
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    S-S bond is present in which of the ion pairs

  • Question 25
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    Which is the correct order of decreasing bond dissociation enthalpy?

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