List of top Chemistry Questions

A solid is made of two elements $X$ and $Z$. The atoms $Z$ are in $ccp$ arrangement while atoms $X$ occupy all the tetrahedral sites. What is the formula of the compound ?
A sample of $O_2$ gas is collected over water at $23 ^{\circ}C$ at a barometric pressure of $751\, mm\, Hg$ (vapour pressure of water at $23^{\circ}C$ is $21\, mm\, Hg$).The partial pressure of $O_2$ gas in the sample collected is
A real gas obeying van der Waal equation will resemble ideal gas if the
A primary alcohol, $C_3H_8O(A)$ on heating with sulphuric acid undergo dehydration to give an alkene, $B$. $B$ when reacted with $HCl$ gave $C$, which on treatment with aqueous $KOH$ gives compound $D(C_3H_8O)$. $A$ and $D$ are
A primary alkyl halide would prefer to undergo
A positive catalyst only
A person living in Shimla observed that cooking food without using pressure cooker takes more time. The reason for this observation is that at high altitude
A pair of compounds and a test name is given in each option. Find the option where the test given cannot be used to differentiate the pair of compounds.
In the following reaction: $CH_3ONa + CO {->[\Delta][{\text{Under pressure}}, HCl]} A$ Here $'A'$ is
A narrow spectrum antibiotic is active against____.
A naturally occurring substance from which a metal can be profitably extracted is known, as
A mole of $N_2H_4$ loses $10$ mol of electrons to form a new compound $Y$. Assuming that all the nitrogen appears in the new compound, what is the oxidation state of nitrogen in $Y$? (There is no change in the oxidation number of hydrogen.)
A mole of $ {N_2H_4}$ loses ten moles of electrons to form a new compound Y. Assuming that all the nitrogen appears in the new compound, what is the oxidation state'of nitrogen in Y? (there is no change in the oxidation number of hydrogen)
A mixture of three gases, ethane, ethene and ethyne are passed through ammoniacal solution of cuprous chloride. The emergent gas(es) after it was passed through solution contained
A mixture of $C_3H_8$ and $CH_4$ exerts a pressure of 320 mm Hg at temperature T K in a V litre flask. On complete combustion, gaseous mixture contains $CO_2$ only and exerts a pressure of 448 mm Hg under identical conditions. Hence mole fraction of $C_3H_8$ in the mixture is
A mixture of dihydrogen and dioxygen at one bar pressure contains 20% by weight of dihydrogen. What would be the partial pressure of dihydrogen in bar?
A metallic element exists as cubic lattice. Each edge of the unit cell is $2.88 \, \mathring A$. The density of the metal is 7.20 g $cm^{-3}$. How many unit cell will be present in 100 g of the metal?
A metal $M$ readily forms its sulphate $MSO_4$ which is water soluble. It forms its oxide $MO$ which becomes inert on heating. It forms its insoluble hydroxide $M(OH)_2$ which is soluble in $NaOH$ solution. What would be $M$ ?
A metal crystallises in a bcc lattice. Its unit cell edge length is about 300 pm and its molar mass is about $50\, g\, mol^{-1}$. What would be the density of the metal (in $g\, cm^{-3}$)?
A metal crystallises into two cubic phases, face centred cubic $(fcc)$ and body centred cubic $(bcc)$, whose unit cell lengths are $3.5$ $?$ and $3.0$ $?$, respectively. The ratio of densities of $fcc$ and $bcc$ is
A lyophobic colloid cannot be formed by
According to Fajan?s rule polarization is more when
A hydrocarbon with molecular formula $C_8H_{18}$ gives only one monochloro derivative, on chlorination. The compound is
A hydrcarbon reacts with hypochlorous acid to give 2-chloroethanol. The hydrocarbon is
A hydride (X) of Group 15 element is distinctly basic and has unexpeclably high boiling point. It reacts with NaOCl to give another hydride (Y), which is a strong reducing agent and is used in organic analysis. X and Y are