19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Chemical formula of phosgene is (AFMC 2010)
Inorganic benzene is (PMT 2010)
Borax is used as a cleansing agent because on dissolving in water, it gives (RPMT 2010)
BF3 is (RPMT 2010)
The strongest Lewis acid among boron halides is (RPMT 2010)
Assertion: Coloured cations can be identified by borax bead test. Reason: Transparent bead (NaBO2 + B2O3) forms coloured bead with coloured cation. (AIIMS 2009)
Which of the following is used for making optical instruments? (AFMC 2008)
Product of the following reaction is Al C D O -> (PMT 2008)
White lead is (CPMT 2007)
Supercritical CO2 is used as (AIIMS 2007)
Litharge is chemically (AIIMS 2007)
For which one of the following minerals, the composition given is incorrect? (Kerala CEE 2007)
In borax bead test which compound is formed? (Punjab PMET 2007)
Value of x in potash alum, K2SO4.Alx (SO4)3 . 24H2O is (CPMT 2007)
Which glass will not crack when temperature changes ? (DUMET 2006)
The number of isomers possible for disubstituted borazine, B3N3H4X2 is: (AIPMT 2006)
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 ?