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251.

Red phosphorous is less soluble and less volatile than white phosphorous because its structure isA. polymerised chainsB. hexagonal ringsC. tetrahedralD. Planar sheets

Answer» Correct Answer - A
Discussion
252.

Halogen with lowest bond dissociation energy isA. Both (A) and (R) are true and (R) is the correct explanation of (A)B. Both (A) and (R) are true and (R) is not the correct explanation of (A)C. (A) is true and (R) is falseD. (A) is false but (R) is true

Answer» Correct Answer - C
Discussion
253.

Assertion: White phosphorous is more stable than red phosphorous Reason: Red phoshorous exists in polymeric stateA. Both A and R are correct and R is the correct explanation of AB. Both A and R are correct and R is not the correct explanation of AC. A is correct R is wrongD. A is wrong R is correct

Answer» Correct Answer - D
Discussion
254.

(A) : White phosphorous is less reactive than red phosphorous (R) : White phosphorous has more bond angle strain than red phosphorousA. Both (A) and (R) are true and (R) is the correct explanation of (A)B. Both (A) and (R) are true and (R) is not the correct explanation of (A)C. (A) is true and (R) is falseD. (A) is false but (R) is true

Answer» Correct Answer - D
Discussion
255.

Red phosphorus is chemically less reactive becauseA. it does not contain P - P bondsB. It dos not contain tetrahedral `P_(4)` moleculesC. It does not catch fire in air even upto `400^(@)C`D. It has a polymeric structure

Answer» Correct Answer - D
Red phosphorus is less reactive because of its gaint polymeric sturcture
Discussion
256.

The catalyst used in the manufacture of ammonia by Haber process isA. finely divided NickelB. finely divided molybdenumC. finely divided ironD. finely divided Platinum

Answer» Correct Answer - C
Powdered Iron
Discussion
257.

`FeSO_(4)` forms brown ring withA. `N_(2)O`B. NOC. `NO_(2)`D. `N_(2)O_(3)`

Answer» Correct Answer - B
`FeSO_(4)` forms brown ring with NO
Discussion
258.

Select the correct statement ?A. `N_(2)O` with sodium metal in liquid ammonia forms sodium azide and nitrogen gas is liberatedB. Ammonia is oxidised to nitrogen by dilute solution od sodium hypochlorite in presence of glueC. Ammonia dichromate in heating decomposes to given nitrogen and a green coloured compoundD. CaNCN on hydrolysis produces a white precipitate and a gas which turns filter paper moistened with copper sulphate solution deep blue.

Answer» Correct Answer - A::C::D
`3N_(2)O+4na +NH_(3) rarr NaN_(3)+3NaOH +2N_(2)`
`2NH_(3)+NaOCI overset("glue")rarr N_(2)H_(4) +NaCI +H_(2)O`
Discussion