19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Silica is soluble in (Haryana PMT 2009)
The main reason that SiCl4 is easily hydrolyzed as compared to CCl4 is that (Kerala CEE 2009)
Darkening of surface painted with white lead is due to (CPMT 2009)
Which amont the following is not a borane? (AMU 2009)
The lead of the lead pencils melts at (AIIMS 2009) p-BLOCK (Group 13 - 14)
The stability of +1 oxidation state increases in the sequence (AIPMT 2009)
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)
The colour imparted by Co(II) compounds to glass is (AIIMS 2006)
Assertion: Silicones are hydrophobic in nature. Reason: Si–O–Si linkages are moisture sensitive. (AIIMS 2006)
Percentage of lead in lead pencil is (AIPMT 1999)
Which of the following does not show electrical conduction? (AIPMT 1999)
In graphite, electrons are
Boron compounds behave as Lewis acids, because of their (AIPMT 1996)
Aluminium (III) chloride forms a dimer because Aluminium (AIPMT 1995)
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)