Some Basic Concepts of Chemistry

A mixture of $2.3g$formic acid and $4.5g$oxalic acid is treated with concentrate$H_{2}\mathrm{SO}_{4}$. The evolved gaseous mixture is passed through $\mathrm{KOH}$ pellets. What will be the weight in grams of the…

What is the mass of the precipitate formed when 50 mL of $16.9%$ solution of $AgNO_{3}$ is mixed with 50 mL of $5.8%$ NaCl solution? (Ag = 107.8, N = 14, O = 16, Na = 23, Cl = 35.5)

The mass of carbon anode consumed (giving only carbon dioxide) in the production of $270 \mathrm{~kg}$ of a aluminium metal from bauxite by the Hall process is: (Atomic mass : A1 = 27)

Suppose the elements $X$ and $Y$ combine to form two compounds $XY_{2}$ and $X_{3}Y_{2}$. When $0.1\mathrm{mole}$ of $XY_{2}$ weighs $10g$ and $0.05\mathrm{mole}$ of $X_{3}Y_{2}$ weighs $9g$, the atomic weights of $X$…

What mass of $95%$pure $\mathrm{CaCO}_{3}$ will be required to neutralise$50\mathrm{mL}$ of $0.5M\mathrm{HCl}$ solution according to the following reaction?…

An organic compound gives $0.220g$ of $\mathrm{CO}_{2}$and $0.126g$ of $H_{2}O$ on complete combustion. If the $%$ of carbon is $24$ then the $%$ of hydrogen is $_________\times\,10^{-1}.$ (Nearest integer)

The volume of hydrogen liberated at STP by treating$2.4g$of magnesium with excess of hydrochloric acid is ......$\times\,10^{-2}L$. Given Molar volume of gas is$22.4L$at STP. Molar mass of magnesium…

$0.05\mathrm{cm}$ thick coating of silver is deposited on a plate of $0.05m^{2}$area. The number of silver atoms deposited on plate are_______$\times\,10^{23}$. (At mass Ag $\left=108,d=7.9g\mathrm{cm}^{-3}\right)$…

Assume carbon burns according to following equation : $2C(s)+O_{2}(g)\rightarrow\,2\mathrm{CO}\text{(s)}$ when $12g$ carbon is burnt in $48g$ of oxygen, the volume of carbon monoxide produced is $______\times\,10^{-1}L$…

The molality of a $10%(v/V)$ solution of di-bromine solution in $\mathrm{CCl}_{4}$(carbon tetrachloride) is$x$ '. $x=$ $_____\times\,10^{-2}M$. (Nearest integer) [Given : molar mass of…

The density of $3M$solution of $\mathrm{NaCl}$ is $1.0g\mathrm{mL}^{-1}$. Molality of the solution is $______\times\,10^{-2}m$ (Nearest integer). Given: Molar mass of $\mathrm{Na}$ and $\mathrm{Cl}$ is $23$ and $35.5g$…

If $5$ moles of $\mathrm{BaCl}_{2}$is mixed with $2$ moles of $\mathrm{Na}_{3}\mathrm{PO}_{4},$ the maximum number ofmoles of $\mathrm{Ba}_{3}\left(\mathrm{PO}_{4}\right)_{2}$formed is $_________$(Nearest integer)