19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which of the following ions is the most stable ?
A type of zeolite used to convert alcohols directly into gasoline is
Which of the following is the correct statement about silicones ?
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 ?
CO2 is not a poisonous gas but there is increase in concentration of CO2 in the atmosphere due to burning of fossil fuels and decompostion of limestone. The increase in concentration of CO2 may lead to
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 ?
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