Four statements are given below: (P) `B_(2)` solid does not exist, boron have basic building `B_(12)`icosahedral units made up of polyhedron having 20 faces nad 12 corners. (Q) In alum each metal ion is surrounded by six water molecules. ( R) Graphite is used as dry lubricant in machines running at high temperature in place of oil. (S) Fullerene contains twenty, six-membered rings and twelve, five-membered rings. The correct statements are:A. P,R and SB. P and SC. P,Q,R and SD. Q and S

Four statements are given below: (P) `B_(2)` solid does not exist, bor

1.	Four statements are given below: (P) `B_(2)` solid does not exist, boron have basic building `B_(12)`icosahedral units made up of polyhedron having 20 faces nad 12 corners. (Q) In alum each metal ion is surrounded by six water molecules. ( R) Graphite is used as dry lubricant in machines running at high temperature in place of oil. (S) Fullerene contains twenty, six-membered rings and twelve, five-membered rings. The correct statements are:A. P,R and SB. P and SC. P,Q,R and SD. Q and S
Answer» Correct Answer - C

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In which following statement are correct. (a) Anhydrous hydrogen fluroide is a liquid at ordianry temperature while other halogen acid are gases. (b) Lead acetate does not form any precipitate with HF acid but other halogen acid from precipitates. (c) HF is heated with a mixture of `MnO_2` and `H_2SO_4`, no gas is evolved but In case of HCI, HBr and HI acids evolved gases. (d) HF is not oxidised by strong oxidising agent but other halogen acid are oxidised.A. (A) aB. (B) bC. (C) cD. d
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