19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Borax bead test is responded by:
The number of OH units directly linked to boron atoms in Na2B4O7.10H2O is:
Which of the following compounds are formed when boron trichloride is treated with water?
Boron is unable to form BF - ions due to
The element which exists in liquid state for a wide range of temperature and can be used for measuring high temperature is
Which of the following oxides is acidic in nature ?
Which of the following hydroxides is acidic ?
When aluminium is heated with conc. H2SO4
Aluminium does not react with:
Aluminium is more reactive than iron. But aluminium is less easily corroded than iron because:
Electropositive charcter for the elements of group 13 follows the order
The reason behind the lower atomic radius of Ga as compared to Al is
Which one of the statements is incorrect for aluminium metals?
Aluminium exhibits +3 oxidation state. As we move down the group, +1 oxidation state gets more stable. This is a consequence of
Specify the coordination geometry around and hybrid- ization of N and B atoms in 1:1 complex of BF3 and NH3:
Which of the following is a Lewis acid ?
The shapes and hybridisation of BF3 and BH- respectively are
Which of the following halides is least stable and has doubtful existence ?
The most commonly used reducing agent is
The stability of dihalides of Si, Ge, Sn and Pb increases steadily in the sequence
Which of the following types of forces bind together the carbon atoms in diamond? (AIPMT 1992)
Which of the following statements about H3BO3 is not correct? (AIPMT 1994)
The stability of +1 oxidation state increases in the sequence (AIPMT 2009)
The lead of the lead pencils melts at (AIIMS 2009) p-BLOCK (Group 13 - 14)
Which amont the following is not a borane? (AMU 2009)