19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Carbon and silicon belong to (IV) group. The maximum coordination number of carbon in commonly occurring compounds is 4, whereas that of silicon is 6. This is due to (AIPMT 1994)
The type of hybridisation of boron in diborane is (AIPMT 1999)
Which of the following is not true about structure of carbon dioxide ?
Which is not a method of preparing carbon monoxide on a commercial scale ? (a) 473 1273 K (s) (g) (g) 2(g) C H O CO H - + ¾¾¾¾¾® + (b) 1273 K (s) 2(g) 2(g) (g) 2(g) 2C O 4N 2CO 4N + + ¾¾¾® + (c) (g) (s) 2(g) 2C O 2CO …
Match the column I with column II and mark the appropriate choice. Column I Column II
Which of the following is not a use of graphite ?
Which of the following is not true about structure of diamond and graphite ?
Identify the incorrect statement.
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 ?
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
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:
Complex formation is more likely to be possible in _____
Al2O3 formation from aluminium and oxygen involves evolution of a large quantity of heat, which makes alu- minium used in: