19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which glass will not crack when temperature changes ? (DUMET 2006)
Value of x in potash alum, K2SO4.Alx (SO4)3 . 24H2O is (CPMT 2007)
In borax bead test which compound is formed? (Punjab PMET 2007)
Anodised aluminium is :
For which one of the following minerals, the composition given is incorrect? (Kerala CEE 2007)
Litharge is chemically (AIIMS 2007)
Supercritical CO2 is used as (AIIMS 2007)
White lead is (CPMT 2007)
Product of the following reaction is Al C D O -> (PMT 2008)
Which of the following is used for making optical instruments? (AFMC 2008)
Assertion: Coloured cations can be identified by borax bead test. Reason: Transparent bead (NaBO2 + B2O3) forms coloured bead with coloured cation. (AIIMS 2009)
The stability of +1 oxidation state increases in the sequence (AIPMT 2009)
Which of the following is incorrect statement? (NEET 2019)
Which of the following species is not stable? (NEET 2019)
Which of the following compounds is used in cosmetic surgery? (Odisha NEET 2019)
Identify the correct statements from the following: (NEET 2020)
The blue coloured mineral ‘Lapis Lazuli’ which is used as a semi-precious stone is a mineral of the following class:
A metal X reacts with aqueous NaOH solution to form Y and a highly inflammable gas. Solution Y is heated and CO2 is poured through it. Z precipitates out and Na2CO3 is formed. Z on heating gives Al2O3, Identify X, Y a…
When an inorganic compound (X) having 3C—2e as well as 2c—2e bonds reacts with ammonia gas at a cer- tain temperature, gives a compound (Y), isostructural with benzene. Compound (X) with ammonia at a high temperature …
Which of the following is not matched correctly with its use ?
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