19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The lead of the lead pencils melts at (AIIMS 2009) p-BLOCK (Group 13 - 14)
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)
The colour imparted by Co(II) compounds to glass is (AIIMS 2006)
In graphite, electrons are
Which of the following does not show electrical conduction? (AIPMT 1999)
Which glass will not crack when temperature changes ? (DUMET 2006)
Which of the following compounds is used in cosmetic surgery? (Odisha NEET 2019)
A type of zeolite used to convert alcohols directly into gasoline is
In which of the following the inert pair effect is most prominent ?
Which of the following is the correct statement about silicones ?
Which of the following types of forces bind together the carbon atoms in diamond? (AIPMT 1992)
Match the column I with column II and mark the appropriate choice. Column I Column II
Silicon is an important constituent of
Glass and cement are two important examples of
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 purest form of coal is
Identify the incorrect statement.
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 - …
Which of the following is not true about structure of diamond and graphite ?
Which of the following is not a use of graphite ?
Boron compounds behave as Lewis acids, because of their (AIPMT 1996)
When excesss of carbon dioxide is passed through lime water, the milkiness first formed disappears due to
Which one of the following is not the characteristic property of carbon ?
Identify X in the reaction : (steam) X 2H O XO 2H D + ¾¾® +