19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The hardest compound of boron is:
Boron cannot form which one of the following anions? (a) BF- (b) BH-
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 Al2F…
Boron nitride can be represented by the given structure. The structure of BN is similar to
The bonds present in borazole are:
Which of the following compounds is known as inor- ganic benzene?
Borazole, B3N3H6 is related to benzene as:
In B2H6:
The structure of diborane (B2H6) contains :
In diborane, the two H – B – H angles are nearly :
The type of hybridization of boron in diborane is
Borax bead test is responded by:
The number of OH units directly linked to boron atoms in Na2B4O7.10H2O is:
Na B O .10H O Na B O X NaBO B O Y z D ¾¾® ¯ D + 39. (S) Borax is used as a cleansing agent because on dissolv- ing in water, it gives:
Na B O .10H O X Y Z D D ¾¾® ¾¾® + X, Y and Z in the reaction are (a) X Na B O , Y NaBO , Z B O = = = (b) X Na B O , Y B O , Z H BO = = = (c) X B O , Y NaBO , Z B(OH) = = = (d) X NaBO , Y B O , Z B(OH) = = =
On the addition of mineral acid to an aqueous solution of borax, the following compound is formed:
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…
Which of the following compounds are formed when BCl3 is treated with water ?
Which of the following is the electron deficient molecule ?
Which is the hardest compound of boron ?
Borax is not used
Which is not the use of orthoboric acid ?
When aluminium is heated with conc. H2SO4
Aluminium does not react with:
Aluminium is more reactive than iron. But aluminium is less easily corroded than iron because: