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cbse class 10 mcq question bank 2022

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Can PCl3 act as an oxidising as well as reducing agent?

Can PCl 3   act as an oxidising as well as reducing agent? If yes, how? Illustrate with the help of equations. ANswer: Yes, PCl 3   can act both as an oxidising agent as well as reducing agent. It react with sulphur tri oxide to reduce it to sulphur di oxide. PCl 3   +SO 3   -------------> POCl 3   + SO 2 It also react with metals like silver and sodium to form their chlorides. PCl 3   + 6 Na ---------------> 3 NaCl +Na 3 P
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A compound lens is made of two lenses in contact having powers +12.5 D and -2.5 D. An object is placed at 15 cm from this compound lens.Find the position and nature of the image formed.

Question: A compound lens is made of two lenses in contact having powers +12.5 D and -2.5 D. An  object is placed at 15 cm from this compound lens.Find the position and nature of the image formed. Answer: P comp  = P 1   +P 2   = + 10 D F comp   = 100/10 cm 1/F =1/v - 1/u F = +10 cm, u = -15 cm, v = ?                                                                V= +30 cm  Image formed will be real inverted and enlarged.
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Show that all the bonds in PCl5 molecule are not equivalent.

 Show that all the bonds in PCl 5   molecule are not equivalent. Answer: Since Phosphorus penta chloride  breaks down into phosphorus trichloride and chlorine gas on heating which shows that out of five P-Cl bonds three are equitorial and tightly  bonded and two are axial and weak  bonds. PCl 5   ------------> PCl 3   +Cl 2   For more chemistry content visit my website  https://www.chemswot.com
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