19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Identify the correct statements from the following: (NEET 2020)
Which one of the following is the correct statement ?
BCl₃ does not exist as a dimer but BH₃ exists as B₂H₆ because
Product of the following reaction is Al C D O → (PMT 2008)
Boron cannot form which one of the following anions? (a) BF⁻ (b) BH⁻
The main factor responsible for weak acidic nature of B—F bonds in BF₃ is:
The stability of +1 oxidation state increases in the sequence (AIPMT 2009)
Borazole, B₃N₃H₆ is related to benzene as:
Which of the following compounds is known as inor- ganic benzene?
The lead of the lead pencils melts at (AIIMS 2009) p-BLOCK (Group 13 - 14)
NaBH₄ + I₂ ® X + Y + Z BF₃ + NaH 450 K ¾¾¾® X + P BF₃ + LiAlH₄ ® X + Q + R X, Y, Z, P, Q and R in the reactions are X Y Z P Q R (a) Na₄B₄O₇ NaI HI HF LiF AlF₃ (b) B₂H₆ NaI H₂ NaF LiF AlF₃ (c) B₂H₆ BH₃ NaI B₃N₃H₆ Al₂F₆…
The power of halides of boron to act as Lewis acids decreases in the order:
White lead is (CPMT 2007)
Boric acid H₃BO₃ and BF₃ have the same number of elec- trons. The former is a solid and the latter is a gas. The reason is:
H₃BO₃ is:
Which glass will not crack when temperature changes ? (DUMET 2006)
What happens when a mixture of cobalt oxide and borax is heated in a flame on a loop of platinum wire ?
The structure of diborane (B₂H₆) contains :
Litharge is chemically (AIIMS 2007)
The geometry of a complex species can be understood from the knowledge of type of hybridisation of orbitals of central atom. The hybridisation of orbitals of central atom in [B(OH)₄]– and the geometry of the complex a…
In B₂H₆:
Borax is used as a cleansing agent because on dissolving in water, it gives (RPMT 2010)
Which of the following is a false statement ?
The number of OH units directly linked to boron atoms in Na₂B₄O₇.10H₂O is:
Supercritical CO₂ is used as (AIIMS 2007)