Chemistry Question Bank

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)

The type of hybridisation of boron in diborane is (AIPMT 1999)

Which of the following statements about H3BO3 is not correct? (AIPMT 1994)

Which of the following types of forces bind together the carbon atoms in diamond? (AIPMT 1992)

The stability of dihalides of Si, Ge, Sn and Pb increases steadily in the sequence

The most commonly used reducing agent is

Which of the following halides is least stable and has doubtful existence ?

In which of the following the inert pair effect is most prominent ?

The tendency of group 14 elements to show +2 oxidation state increases in the order of

Which of the following ions is the most stable ?

A type of zeolite used to convert alcohols directly into gasoline is

Which of the following is the correct statement about silicones ?

Which one of the following anions is present in the chain structure silicates ? (a) Si O - (b) n (Si O ) - (c) n (SiO ) - (d) SiO - Ans. (c) Sol. There are two general formula of anions of chain silicates are n SiO - …

In SiO , - the tetrahedral molecule, two oxygen atoms are shared in

Glass and cement are two important examples of