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)
Which of the following will be formed, if we heat an aqueous solution of AlCl₃ to dryness ?
When alumina is heated with carbon in nitrogen atmo- sphere, the products are:
The stability of +1 oxidation state increases in the sequence (AIPMT 2009)
Alumina is:
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
Assertion: Silicones are hydrophobic in nature. Reason: Si–O–Si linkages are moisture sensitive. (AIIMS 2006)
AIF₃ is soluble in HF only in presence of KF. It is due to the formation of
In the purification of bauxite by Hall’s process:
Al₂O₃ formation from aluminium and oxygen involves evolution of a large quantity of heat, which makes alu- minium used in:
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
Aluminium chloride exists as dimer, Al₂Cl₆ in solid state as well as in solution of non-polar solvents such as benzene. When dissolved in water, it gives
Which of the following ions is the most stable ?
Borax is used as a cleansing agent because on dissolving in water, it gives (RPMT 2010)
Which of the following is incorrect statement? (NEET 2019)
Heating an aqueous solution of aluminium chloride to dryness will give
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 ?
Na B O X H BO . + ® What is X in the reaction ?
From B₂H₆, all the following can be prepared except:
Which of the following types of forces bind together the carbon atoms in diamond? (AIPMT 1992)
Which of the statement is true for the above sequence of reactions?
A mixture of boron trichloride and hydrogen is subjected to silent electric discharge to form ‘A’ and HCl. ‘A’ is mixed with NH₃ and heated to 200 °C to form ‘B’. The formula of ‘B’ is:
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)
Which of the following is a false statement ?