19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
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
Which of the following is not matched correctly with its use ?
When an inorganic compound (X) having 3C—2e as well as 2c—2e bonds reacts with ammonia gas at a cer- tain temperature, gives a compound (Y), isostructural with benzene. Compound (X) with ammonia at a high temperature …
A metal X reacts with aqueous NaOH solution to form Y and a highly inflammable gas. Solution Y is heated and CO2 is poured through it. Z precipitates out and Na2CO3 is formed. Z on heating gives Al2O3, Identify X, Y a…
The blue coloured mineral ‘Lapis Lazuli’ which is used as a semi-precious stone is a mineral of the following class:
Identify the correct statements from the following: (NEET 2020)
Supercritical CO2 is used as (AIIMS 2007)
Litharge is chemically (AIIMS 2007)
For which one of the following minerals, the composition given is incorrect? (Kerala CEE 2007)
In borax bead test which compound is formed? (Punjab PMET 2007)
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)
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