List of top Chemistry Questions

What is the mass of carbon dioxide which contains the same number of molecules as are contained in $40\, g$ of oxygen?
What is the mass per cent of oxygen in ethanol?
What volume of hydrogen gas, at $273\, K$ and $1$ atm. pressure will be consumed in obtaining $21.6 \,g$ of elemental boron (atomic mass $= 10.8$) from the reduction of boron trichloride by hydrogen ?
What will be the mass of $100$ atoms of hydrogen?
What will be the molality of the solution containing $18.25\, g$ of $HCl$ gas in $500\, g$ of water?
What will be the weight of $CO$ having the same number of oxygen atoms as present in $22\, g$ of $CO_{2}$?
Which of the following contains maximum number of atoms ?
'x' grams of calcium carbonate was completely burnt in air. The weight of the solid residue formed is 28 g. What is the value of 'x' in grams ?
x g of Ag was dissolved in $HNO_3$ and the solution was treated with excess of NaCl when 2.87 g of AgCl was precipitated. The value of x is
With increase of temperature, which of these changes ?
Which of the postulates of Dalton's atomic theory is incorrect:
Which of the following samples contains the smallest number of atoms ?
Which of the following is the most accurate measurement?
Which of the following has the highest mass ?
$74.5\, g$ of a metallic chloride contain $35.5\, g$ of chlorine. The equivalent weight of the metal is
The least count of an instrument is $0.01\, cm$: Taking all precautions, the most possible error in the measurement can be:
The equivalent weight of a solid element is found to be $9$. If the specific heat of this element is $ 1.05\,J{{g}^{-1}}{{K}^{-1}}, $ then its atomic weight is:
Which element has the highest first ionization potential?
A mixture of ethane and ethene occupies $41\,L$ at $1\,atm$ and $500\, K$. The mixture reacts completely with $ \frac{10}{3} $ mole of $ {{O}_{2}} $ to produce $ C{{O}_{2}} $ and $ {{H}_{2}}O $ . The mole fraction of ethane and ethene in the mixture are respectively ($R\, =\, 0.082\, L \,atm$ $ {{K}^{-1}}mo{{l}^{-1}} $ )
How much time (in hours) would it take to distribute one Avogadro number of wheat grains, if $ {{10}^{20}} $ grains are distributed each second?
What is the percentage of cation in ammonium dichromate ?
Most electropositive metals are obtained from their ores by
Pure hydrogen is obtained by carrying electrolys is of
The hydrogen electrode is dipped in a solution of pH = 3 at 25$^\circ$C. The potential of the cell would be (the value of 2.303 RT/F is 0.059 V)
$SF_6$ exists but $OF_6$ does not because