19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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
Silicon is an important constituent of
Which of the following acids cannot be stored in glass ?
CO2 is not a poisonous gas but there is increase in concentration of CO2 in the atmosphere due to burning of fossil fuels and decompostion of limestone. The increase in concentration of CO2 may lead to
Which of the following is not true about structure of carbon dioxide ?
Which is not a method of preparing carbon monoxide on a commercial scale ? (a) 473 1273 K (s) (g) (g) 2(g) C H O CO H - + ¾¾¾¾¾® + (b) 1273 K (s) 2(g) 2(g) (g) 2(g) 2C O 4N 2CO 4N + + ¾¾¾® + (c) (g) (s) 2(g) 2C O 2CO …
Match the column I with column II and mark the appropriate choice. Column I Column II