List of top Chemistry Questions

How many seconds are there in $3$ days?

How much does mass of $NH_3$ contain same number of atoms as in $4\, g$ atom of oxygen?

How much mass of silver nitrate will react with $5.85\, g$ of sodium chloride to produce $14.35 \,g$ of silver chloride and $8.5\, g$ of sodium nitrate if law of conservation of mass is followed?

Hydrogen and oxygen combine to form $H_2O_2$ and $H_2O$ containing 5.93% and 11.2% hydrogen respectively. The data illustrates

Hydrogen gas is prepared in the laboratory by reacting dilute $HCl$ with granulated zinc. Following reaction takes place : $Zn+2HCl \to Zn Cl_{2} +H_{2}$ What would be the volume of hydrogen gas liberated at $STP$ when $32.65 \,g$ of zinc reacts with $HCl$?

If 20 g of $CaCO_3$ is treated with 100 mL of 20% HCl solution, the amount of $CO_2$ produced is

If 224 mL of a triatomic gas has a mass of 1 g at 273 K and 1 atm. pressure, then the mass of one atom is

If 30 mL of $H_2$ and 20 mL of $O_2$ reacts to form water, what is left at the end of the reaction ?

If $40 \,g$ of $CaCO_{3}$ is treated with $40\, g$ of $HCl$, which of the reactants will act as limiting reagent?

If 6.3 g of $NaHCO_3$ are added to 15.0 g of $CH_3COOH$ solution ,the residue is found to weigh 18.0 g. The mass of $CO_2$ released in the reactionis

If isotopic distribution of C-12 and C-14 is 98% and 2% respectively, then the number of C-14 atoms in 12 g of carbon is

If law of conservation of mass was to hold true, then 20.8 g of $BaCl_2$ on reaction with 9 8 g of $H_2S0_4$ will produce 7.3 g of HCl and $BaS0_4$ equal to

If LPG cylinder contains mixture of butane and isobutane,then the amount of oxygen that would be required for combustion of 1 kg of it will be

If $N_A$ is Avogadro's number then number of valence electrons in 4.2 g of nitride ions $N^{3-}$ is

If $N_A$ is Avogadro's number, then the number of oxygen atom in one g-equivalent of oxygen is

If one million atoms of silver weigh $1.79 \times 10^{-16}g$, the gram atomic weight of silver is

If potassium chlorate is 80% pure, then 48 g of oxygen would be produced from (atomic mass of K= 39) ;

If the atomic mass of carbon was set at 100 u, what would be the value of Avogadro's number ?

If the concentration of glucose $(C_{6}H_{12}O_{6})$ in blood is $0.9\, g\, L^{-1}$, what will be the molarity of glucose in blood?

If the density of water is 1 g $cm^{-3}$ then the volume occupied by one molecule of water is approximately

If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of substance will

In a given sample of $H_2O_2$ each 100 mL of solution contains 68 mg of $H_2O_2$. The molarity of the solution is

Insulin contains 3.4% sulphur. What will be the minimum molecular weight of insulin ?

Iron can be obtained by reduction of iron oxide $(Fe_{3}O_{4})$ with $CO$ according to the reaction: $Fe_{3}O_{4} + 4CO \to3Fe +4CO_{2}$ How many kg of $Fe_{3}O_{4}$ should be heated with $CO$ to get $3\, kg$ of iron?

KBr contains 32.9 % potassium by mass. If 6.40g of $Br_2$ is made to react with 3.60 g of potassium the actual mass of potassium which reacted with $Br_2$ is