19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which of the following does not show similarity between boron and aluminium ?
When aluminium hydroxide dissolves in NaOH solution, the product is:
Anodising can be done by electrolysing dilute H2SO4 with aluminium as anode. This results in :
The main factor responsible for weak acidic nature of B—F bonds in BF3 is:
Which of the following compounds are formed when boron trichloride is treated with water?
Boron is unable to form BF - ions due to
The element which exists in liquid state for a wide range of temperature and can be used for measuring high temperature is
Which of the following oxides is acidic in nature ?
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 ?
Which of the following compounds is used in cosmetic surgery? (Odisha NEET 2019)
The shapes and hybridisation of BF3 and BH- respectively are
Which of the following is the correct statement about silicones ?
Which one of the following anions is present in the chain structure silicates ? (a) Si O - (b) n (Si O ) - (c) n (SiO ) - (d) SiO - Ans. (c) Sol. There are two general formula of anions of chain silicates are n SiO - …
In SiO , - the tetrahedral molecule, two oxygen atoms are shared in
Compound (B) is:
Compound (A) is:
Aluminium becomes passive in:
A type of zeolite used to convert alcohols directly into gasoline is
Which one of the following metals cannot be extracted by using Al as a reducing agent?
Anodised aluminium is :
Thermite a mixture used for welding is:
The reaction which is not involved in thermite process: (a) 3Mn O 8Al 9Mn 4Al O + ¾¾® + (b) Cr O 2Al 2Cr Al O + ¾¾® + (c) 2Fe Al O Fe O 2Al + ¾¾® + (d) B O 2Al 2B Al O + ¾¾® +
Glass and cement are two important examples of