19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which one of the following is the correct statement ?
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 statements about anhydrous alu- minium chloride is correct?
A gas other than HCl is obtained in : (a) Silent electric discharge BCl + H ¾¾¾¾¾® (b) LiAlH + BF ®
Identify X and Y in the following reaction. NaBH 140ºC C H Cl BCl NH Cl X Y + ¾¾¾¾® ¾¾¾¾®
Trimethylammonia is pyramidal whereas trisilylammonia is a planar molecule. Why ?
Specify the coordination geometry around and hybrid- ization of N and B atoms in 1:1 complex of BF3 and NH3:
Which of the following is a Lewis acid ?
The shapes and hybridisation of BF3 and BH- respectively are
The correct order of atomic radii in group 13 elements is (NEET 2018)
MF which one of the following elements is unable to form ion? (NEET 2018)
It is because of inability of ns2 electrons of the valence shell to participate in bonding that (NEET 2017)
The element Z = 114 has been discovered recently. It will belong to which of the following family/group and electronic configuration ? (NEET 2017)
Boric acid is an acid because its molecule (NEET 2016)
The basic structural unit of silicates is (NEET 2013)
Which of the following structure is similar to graphite? (NEET 2013)
Name the type of the structure of silicate in which one oxygen atom of [SiO4]4– is shared? (AIPMT 2011)
Which of the following is not hydrolysed easily? (OJEE 2010)
Which of the following is used for making optical instruments? (AFMC 2008)
Product of the following reaction is Al C D O -> (PMT 2008)