19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
A type of zeolite used to convert alcohols directly into gasoline is
The tendency of group 14 elements to show +2 oxidation state increases in the order of
An element of group 14 forms two oxides one of which is highly poisonous and neutral. Other oxide can be easily liquefied and compressed to give a solid which is used as a refrigerant under the name of drikold. The el…
Identify the incorrect statement.
Alumina is:
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
Identify X in the reaction : (steam) X 2H O XO 2H D + ¾¾® +
Alumina is:
Graphite is soft while diamond is hard because
Which of the following is not from 14 th group
Heating an aqueous solution of aluminium chloride to dryness will give
Which of the following will be formed, if we heat an aqueous solution of AlCl₃ to dryness ?
Identify the wrong example from the following for the group 14 elements.
When alumina is heated with carbon in nitrogen atmo- sphere, the products are:
AlCl₃ on hydrolysis gives:
When excesss of carbon dioxide is passed through lime water, the milkiness first formed disappears due to
Al₂O₃ formation from aluminium and oxygen involves evolution of a large quantity of heat, which makes alu- minium used in:
AIF₃ is soluble in HF only in presence of KF. It is due to the formation of
Which one is the wrong statement ?
In the purification of bauxite by Hall’s process:
Moderate electrical conductivity is shown by
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
Match the column I with column II and mark the appropriate choice. Column I Column II (A) Coal gas (i) CO + H₂ (B) Synthesis gas (ii) CH₄ (C) Producer gas (iii) H₂ + CH₄ + CO (D) Natural gas (iv) CO + N₂
In graphite, the layers of carbon atoms are held by
Which of the following halides is least stable and has doubtful existence ?