List of top Chemistry Questions

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
A heat engine absorbs heat $Q_1$ at temperature $T_1$ and heat $Q_2$ at temperature $T_2$. Work done by the engine is $(Q_1 + Q_2)$. This data
A halogen atom combines with another non-metal to form a compound with slight metallic lustre. The halogen atom is
A Grignard reagent may be made by reacting magnesium with
A gaseous mixture of three gases A. B and C has a pressure of 10 atm. The total number of moles of all the gases is 10. If the partial pressures of Aand B are 3.0 and 1.0 atm respectively and if C has a mol/wt. of 2.0. What is the weight of C in g present in the mixture ?
A gaseous mixture contains oxygen and nitrogen in the ratio of 1 : 4 by weight therefore the ratio of their number of molecules is
A gas $(X)$ is obtained when copper reacts with dilute $HNO_3$. The gas thus formed reacts with oxygen to give brown fumes of $(Y)$. $(Y)$ when dissolved in water gives an important acid $(Z)$ and the gas $(X)$. $X$ , $Y$ and $Z$ respectively are
A gas X diffuses three times faster than another gas Y, the ratio of their densities i.e., $D_x : D_y$ is
A galvanic cell is set up from a zinc bar weighing 100 g and 1.0 litre of 1.0 M Cu $SO_4$ solution. How long would the cell run if it is assumed to deliver a steady current of 1.0 ampere ? (Atomic mass of Zn = 65)
A furanose ring consists of a skeleton of
A flask containing air (open to the atmosphere) is heated from 300 K to 500 K. The percentage of air escaped to the atmosphere is
A dispersion of AgCl in water is
A diode used as a rectifier is
A current of 9.65 ampere flowing for 10 minutes deposits 3.0 g of the metal which is monovalent. The atomic mass of the metal is
Bakelite is obtained from phenol by reacting with
Which of the following is not a condensation polymer ?
A compound is formed by two elements $Y$ and $Z$. The element $Z$ forms $ccp$ and atoms $Y$ occupy $1/3\, rd$ of tetrahedral voids. The formula of the compound is