19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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
Glass and cement are two important examples of
Silicon is an important constituent of
Which of the following acids cannot be stored in glass ?
Identify X in the reaction : (steam) X 2H O XO 2H D + ¾¾® +
When excesss of carbon dioxide is passed through lime water, the milkiness first formed disappears due to
AlCl3 on hydrolysis gives:
Which one of the following is not the characteristic property of carbon ?
Graphite is soft while diamond is hard because
Moderate electrical conductivity is shown by
Catenation i.e., linking of similar atoms depends on size and electronic configuration of atoms. The tendency of catenation in Group 14 elements follows the order
There is a large number of carbon compounds due to
Maximum ability of catenation is shown by
Alumina is:
Alumina is:
When alumina is heated with carbon in nitrogen atmo- sphere, the products are:
Which of the following will be formed, if we heat an aqueous solution of AlCl3 to dryness ?
Heating an aqueous solution of aluminium chloride to dryness will give
Alumina may be converted into anhydrous aluminium chloride by:
The incorrect statement regarding above reactions is:
Select the true statements: (i) The formula of the corundum is Al2O3. (ii) The formula of cryolite is Na3AlF6. (iii) The formula of borax is Na2B4O7.10H2O (iv) The formula of bauxite is Al2O3.H2O
In the purification of bauxite by Hall’s process:
AIF3 is soluble in HF only in presence of KF. It is due to the formation of
When excess of NaOH solution is added in potash alum, the product is: