19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which glass will not crack when temperature changes ? (DUMET 2006)
Heating an aqueous solution of aluminium chloride to dryness will give
Which of the following will be formed, if we heat an aqueous solution of AlCl₃ to dryness ?
The stability of +1 oxidation state increases in the sequence (AIPMT 2009)
When alumina is heated with carbon in nitrogen atmo- sphere, the products are:
AlCl₃ on hydrolysis gives:
Assertion: Silicones are hydrophobic in nature. Reason: Si–O–Si linkages are moisture sensitive. (AIIMS 2006)
Al₂O₃ formation from aluminium and oxygen involves evolution of a large quantity of heat, which makes alu- minium used in:
AIF₃ is soluble in HF only in presence of KF. It is due to the formation of
Which one is the wrong statement ?
In the purification of bauxite by Hall’s process:
Match the column I with column II and mark the appropriate choice. Column I Column II (A) Coal gas (i) CO + H₂ (B) Synthesis gas (ii) CH₄ (C) Producer gas (iii) H₂ + CH₄ + CO (D) Natural gas (iv) CO + N₂
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 - …
Borax is used as a cleansing agent because on dissolving in water, it gives (RPMT 2010)
MF which one of the following elements is unable to form ion? (NEET 2018)
Select the true statements: (i) The formula of the corundum is Al₂O₃. (ii) The formula of cryolite is Na₃AlF₆. (iii) The formula of borax is Na₂B₄O₇.10H₂O (iv) The formula of bauxite is Al₂O₃.H₂O
The lead of the lead pencils melts at (AIIMS 2009) p-BLOCK (Group 13 - 14)
Which of the following is not matched correctly with its use ?
Which of the statement is true for the above sequence of reactions?
Na B O X H BO . + ® What is X in the reaction ?
Which of the following types of forces bind together the carbon atoms in diamond? (AIPMT 1992)
Boric acid is used in carrom boards for smooth gliding of pawns because:
From B₂H₆, all the following can be prepared except:
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 power of halides of boron to act as Lewis acids decreases in the order: