19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The most stable form of carbon at high temperature is X. The C – C bond length in diamond is Y while C – C bond length in graphite is Z. What are X, Y and Z respectively ?
The members of group 14 form tetrahalides of the type MX4. Which of the following halides cannot be readily hydrolysed by water ?
Carbon shows a maximum covalency of four whereas other members can expand their covalence due to
The purest form of coal is
What is the number of free electrons present on each carbon atom in graphite ?
In graphite, the layers of carbon atoms are held by
In graphite, C atom is in .......... state.
Which of the following does not depict properties of fullerenes ?
Buckminsterfullerence is
The hardest substance is
Sindoor is represented by
Which of the following oxides can act as a reducing agent ?
Which one of the following oxides is neutral ?
Identify the wrong example from the following for the group 14 elements.
All members of group 14 when heated in oxygen form oxides. Which of the following is the correct trend of oxides ?
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…
Aluminium chloride exists as dimer, Al2Cl6 in solid state as well as in solution of non-polar solvents such as benzene. When dissolved in water, it gives
Which of the following is not from 14 th group
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
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