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(A) The polymerization of propylene is c...

(A) The polymerization of propylene is carried out in presence of `SnCl_(4)` and Aluminium triethyl chloride
(R) : `SnCl_(4)` and Aluminium triethyl chloride acts as the catalyst in the polymerization reaction

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

(A) is false but (R) is true

Text Solution

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The correct Answer is:
C
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CO is an unsaturated compound because all the valancies of carbon are not satisfied and forms addition compounds e.g It forms carbonyl sulphide (COS) with sulphur, carbonyl chloride (phosgene COCl_(2) ) with chlorine, sodium formate with NaOH, methyl alcohol with H_(2) , in the presence of ZnO //Cr_(2)O as catalyst) The dehydration of malonic acid CH_(2)(COOH)_(2) with P_(4)O_(10) and heat give

K_2Cr_2O_7 acts as a good oxidizing agent in acidic medium underset("Orange")(Cr_(2)O_(7)^(2-)) + 14H^(+) + 6e^(-) rarr underset("Green")(2Cr^(3+)) + 7H_2O In alkaline solution, orange colour of Cr_(2)O_(7)^(2-) chages to yellow colour due to formation of Cr_2O_(4)^(2-) and again yellow colour changes to orange colour on changing the solution to acidic medium underset("Orange")(Cr_2O_7^(2-))+2OH^(_) rarrunderset("Yellow")(Cr_2O_7^(2-))+H_2O underset("Yellow")(2CrO_(4)^(2_-)) + 2H^(+) rarr underset("Orange")(Cr_(2)O_(7)^(2-) + H_(2)O) Cr_(4)^(2-) and Cr_(2)O_(7)^(2-) exist in equilibrium at pH =4 and are interconvertible by altering the pH of the solution. When heated with H_2SO_4 and metal chloride K_2Cr_2O_7 gives vapour of chromyl chloride (CrO_2Cl_2) . Chromyl chloride (CrO_2Cl_2) when passed into aqueous NaOH solution, yellow colour solution of CrO_(4)^(2-) is obtained. This on reaction with lead acetate gives yellow ppt. PbCrO_4 . When H_2O_2 is added to an acidified solution of dichromate ion, a complicated reaction occurs. The products obtained depend on the pH and concentration of dichromate. Cr_2O_7^(2-)+2H^(+) + 4H_(2)O_(2) rarr 2Cr(O_2)+5H_2O A deep blue-violet coloured peroxo compound, CrO(O_2)_2, ' called chromic peroxide is formed. This decomposes rapidly in aqueous solution into Cr^(3+) and xygen. CrO_3 on reaction with HCl and the product on reaction with NaOH(aq) give respectively

K_2Cr_2O_7 acts as a good oxidizing agent in acidic medium underset("Orange")(Cr_(2)O_(7)^(2-)) + 14H^(+) + 6e^(-) rarr underset("Green")(2Cr^(3+)) + 7H_2O In alkaline solution, orange colour of Cr_(2)O_(7)^(2-) chages to yellow colour due to formation of Cr_2O_(4)^(2-) and again yellow colour changes to orange colour on changing the solution to acidic medium underset("Orange")(Cr_2O_7^(2-))+2OH^(_) rarrunderset("Yellow")(Cr_2O_7^(2-))+H_2O underset("Yellow")(2CrO_(4)^(2_-)) + 2H^(+) rarr underset("Orange")(Cr_(2)O_(7)^(2-) + H_(2)O) Cr_(4)^(2-) and Cr_(2)O_(7)^(2-) exist in equilibrium at pH =4 and are interconvertible by altering the pH of the solution. When heated with H_2SO_4 and metal chloride K_2Cr_2O_7 gives vapour of chromyl chloride (CrO_2Cl_2) . Chromyl chloride (CrO_2Cl_2) when passed into aqueous NaOH solution, yellow colour solution of CrO_(4)^(2-) is obtained. This on reaction with lead acetate gives yellow ppt. PbCrO_4 . When H_2O_2 is added to an acidified solution of dichromate ion, a complicated reaction occurs. The products obtained depend on the pH and concentration of dichromate. Cr_2O_7^(2-)+2H^(+) + 4H_(2)O_(2) rarr 2Cr(O_2)+5H_2O A deep blue-violet coloured peroxo compound, CrO(O_2)_2, ' called chromic peroxide is formed. This decomposes rapidly in aqueous solution into Cr^(3+) and xygen. What happens when a solution of potassium chromate is treated with an excess of dilute nitric acid?

K_2Cr_2O_7 acts as a good oxidizing agent in acidic medium underset("Orange")(Cr_(2)O_(7)^(2-)) + 14H^(+) + 6e^(-) rarr underset("Green")(2Cr^(3+)) + 7H_2O In alkaline solution, orange colour of Cr_(2)O_(7)^(2-) chages to yellow colour due to formation of Cr_2O_(4)^(2-) and again yellow colour changes to orange colour on changing the solution to acidic medium underset("Orange")(Cr_2O_7^(2-))+2OH^(_) rarrunderset("Yellow")(Cr_2O_7^(2-))+H_2O underset("Yellow")(2CrO_(4)^(2_-)) + 2H^(+) rarr underset("Orange")(Cr_(2)O_(7)^(2-) + H_(2)O) Cr_(4)^(2-) and Cr_(2)O_(7)^(2-) exist in equilibrium at pH =4 and are interconvertible by altering the pH of the solution. When heated with H_2SO_4 and metal chloride K_2Cr_2O_7 gives vapour of chromyl chloride (CrO_2Cl_2) . Chromyl chloride (CrO_2Cl_2) when passed into aqueous NaOH solution, yellow colour solution of CrO_(4)^(2-) is obtained. This on reaction with lead acetate gives yellow ppt. PbCrO_4 . When H_2O_2 is added to an acidified solution of dichromate ion, a complicated reaction occurs. The products obtained depend on the pH and concentration of dichromate. Cr_2O_7^(2-)+2H^(+) + 4H_(2)O_(2) rarr 2Cr(O_2)+5H_2O A deep blue-violet coloured peroxo compound, CrO(O_2)_2, ' called chromic peroxide is formed. This decomposes rapidly in aqueous solution into Cr^(3+) and xygen. Which of the following statements is wrong when a mixture of NaCI and K_2Cr_2O_2 is gently walmed with conc. H_2SO_4 ?

NaBH_(4) is ionic compound contain BH_(4)^(-) tetrahydridoborate ion and in solid state NaBH_(4) has sodium chloride structure. Not all tetrahydridoborates are ionic. The beryllium, aluminium and transition metal borohydrides become increasingly covalent and volatile. In these type of tetrabydrido borate the BH_(4)^(-) form covalent bond with metal ion. One or more H atoms in a BH_(4)^(-) act as a bridged bond to metal, forming a three centre bond with two electrons shared by three atoms. The BH_(4)^(-) is usually in that it may fonn one two or three such three centre bonds to the metal ion when fonns covalent bond. Be(BH_(4))_(2) and AI(BH_(4))_(3) are covalent and structures are given below: Select incorrect statement about ' Li [AIH_(4)]

NaBH_(4) is ionic compound contain BH_(4)^(-) tetrahydridoborate ion and in solid state NaBH_(4) has sodium chloride structure. Not all tetrahydridoborates are ionic. The beryllium, aluminium and transition metal borohydrides become increasingly covalent and volatile. In these type of tetrabydrido borate the BH_(4)^(-) form covalent bond with metal ion. One or more H atoms in a BH_(4)^(-) act as a bridged bond to metal, forming a three centre bond with two electrons shared by three atoms. The BH_(4)^(-) is usually in that it may fonn one two or three such three centre bonds to the metal ion when fonns covalent bond. Be(BH_(4))_(2) and AI(BH_(4))_(3) are covalent and structures are given below:

AAKASH SERIES-POLYMERS-Level - I (Exercise - II) (Assertion (A) & Reason (R) type questions)
  1. (A) : The gross mobility of elastomer chain is its special characteris...

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  2. (A) : Natural rubber is an addition polymer. (R) : Natural rubber ha...

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  3. (A) : Natural rubber is elastic and non-cryslalline. (R) : Weak vand...

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  4. (A) Polypropylene is an addition polymer (R) : Polypropylene is poly...

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  5. (A) : Polybutadiene is an example of chain growth polymer (R) : In c...

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  6. (A) The polymerization of propylene is carried out in presence of SnCl...

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  7. (A) : Most of the polymeric materials are non biodegradable (R) : Bu...

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  8. (A) : Cellulose acetate and cellulose nitrate are used in textiles bec...

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  9. (A) : Styrene is more reactive than propene towards cationic polymeriz...

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  10. (A) : Bakelite is copolymer (R) : Bakelite is a thermosetting materi...

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  11. (A) : Glyptal is obtained by the condensation polymerization of ethyle...

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  12. (A) : Novac is heated in presence of hexamethyl tetramine to form hard...

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  13. (A) : Nylon 6,6 is a fibre. Because (R) : It is an addition polymer

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  14. (A) Nylon - 6,6 is classified as a condensation heteropolymer. (R) :...

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  15. (A) : Bakelite is thermosetting polymer. (R) : Bakelite has three di...

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  16. (A) : Natural rubber is a polymer of cis-isoprene (R) : Poly trans i...

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  17. (A) : The vulcanised rubber has greater elasticity and tensile strengt...

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  18. (A) : Addition of CH(3)COOH and HCOOH electrolytes causes coagulation ...

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  19. (A) : Osmotic pressure method is the most suitable method to determine...

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  20. (A) : Molecular mass of polymers is always expressed as an average (...

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