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C60, an allotrope of carbon contains

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Important Questions on The p-Block Elements

HARD
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IMPORTANT
The number of P-OH bonds and the oxidation state of phosphorus atom in pyrophosphoric acid H4P2O7, respectively are:
MEDIUM
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IMPORTANT
The correct sequence of decreasing number of π -bonds in the structure of H2SO3, H2SO4 and H2S2O7 is:
EASY
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XeF6 on partial hydrolysis with water, produces a compound X. The same compound X is formed when XeF6 reacts with silica. The compound X is:
EASY
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IMPORTANT
The non-metal that does not exhibit positive oxidation state is:
MEDIUM
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IMPORTANT
Match the items in Column I with its main use listed in Column II:
 
  Column I   Column II
A Silica gel i. Transistor
B Silicon ii. Ion-exchanger
C Silicone iii. Drying agent
D Silicate iv. Sealant
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The gas evolved on heating CaF2 and SiO2 with concentrated H2SO4, on hydrolysis gives a white gelatinous precipitate. The precipitate is:
MEDIUM
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IMPORTANT
Arrange the following bonds according to their average bond energies in descending order:
C-Cl,C-Br,C-F,C-I