19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The hardest substance is
Buckminsterfullerence is
Glass and cement are two important examples of
Which one of the following oxides is neutral ?
Which one of the following is not the characteristic property of carbon ?
Which of the following oxides can act as a reducing agent ?
Sindoor is represented by
All members of group 14 when heated in oxygen form oxides. Which of the following is the correct trend of oxides ?
Which of the following does not depict properties of fullerenes ?
When excesss of carbon dioxide is passed through lime water, the milkiness first formed disappears due to
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
Graphite is soft while diamond is hard because
The incorrect statement regarding above reactions is:
Alumina is:
AlCl₃ on hydrolysis gives:
Alumina may be converted into anhydrous aluminium chloride by:
Which of the following will be formed, if we heat an aqueous solution of AlCl₃ to dryness ?
When alumina is heated with carbon in nitrogen atmo- sphere, the products are:
Maximum ability of catenation is shown by
Alumina is:
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
When excess of NaOH solution is added in potash alum, the product is:
AIF₃ is soluble in HF only in presence of KF. It is due to the formation of
In the purification of bauxite by Hall’s process:
Alumina is: