19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The tendency of BF3, BCl3 and BBr3 to behave as Lewis acid decreases in the sequence (AIPMT 2010)
Boric acid is an acid because its molecule (NEET 2016)
Assertion : In water, orthoboric acid behaves as a weak monobasic acid. Reason : In water, orthoboric acid acts as a proton donor.
Assertion : Boron is p block element. Reason : Last electron entres in p sub shell.
The strongest Lewis acid among boron halides is (RPMT 2010)
Assertion : Boron always forms covalent bond. Reason : The small size of B3+ favours formation of co- valent bond.
Assertion : AlF3 is soluble in KF but addition of BF3 brings its precipitation. Reason BF3 is more acidic than AlF3.
BF3 is (RPMT 2010)
Borax is used as a cleansing agent because on dissolving in water, it gives (RPMT 2010)
Inorganic benzene is (PMT 2010)
Chemical formula of phosgene is (AFMC 2010)
Graphite is a good conductor of electricity. Its electrical conductivity is due to the fact that (CPMT 2010)
Which of the following is not attacked by hot sodium hydroxide solution? (Manipal 2010)
Match the column I with column II and mark the appropriate choice. Column I Column II (A) Galena (i) Abrasive (B) Diamond (ii) Metal carbonyls (C) Carbon monoxide (iii) Hydrides of Si (D) Silanes (iv) An ore of lead
Assertion : Al(OH)3 is amphoteric in nature. Reason : Al—O and O—H bonds can be broken with equal ease in Al (OH)3.
Assertion : BF3 is a weaker Lewis acid than BCl3. Reason : BF3 molecule is stabilized to a greater extent than BCl3 by B—F p-bonding.
Name the type of the structure of silicate in which one oxygen atom of [SiO4]4– is shared? (AIPMT 2011)
Which of the following structure is similar to graphite? (NEET 2013)
Which type of silicate is shown in the given figure (Guj. CET 2010)
Which of the following is not hydrolysed easily? (OJEE 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)
Silicon is an important constituent of