List of top Chemistry Questions on Laws of Chemical Combinations

The number of atoms in 0.1 mole of a triatomic gas will be (\( \text{N}_A = 6.02 \times 10^{23} \)):
Find the number of atoms present in \(11.2\ \text{L}\) of nitrogen gas at STP.
If \(20 \text{ g}\) of \(\text{CaCO}_3\) is treated with \(100 \text{ mL}\) of \(20\%\) \(\text{HCl}\) solution, the amount of \(\text{CO}_2\) produced is:
How many molecules of \(CO_2(g)\) are obtained on reaction of 24 grams of methane with 4 moles of oxygen?
The number of molecules of ethane (molar mass $=30$) present in 3 g of pure ethane is
Calculate the number of carbon atoms present in \(0.35\) mole of glucose \((C_6H_{12}O_6)\).
What is the number of hydrogen atoms present in 5.4 g of urea?
Which of the following has the highest molar mass? \((\text{Atomic masses: N}=14,\ \text{O}=16,\ \text{Ag}=108,\ \text{Pb}=208,\ \text{Na}=23,\ \text{H}=1,\ \text{K}=39)\)
What is the number of hydrogen atoms present in 5.4 g of urea?
How many moles of methane are required to produce $11\ \text{g}$ $CO_{2(g)}$ after combustion? (Molar mass of $CO_{2}=44\ \text{g mol}^{-1}$)
What is the number of hydrogen atoms present in 5.4 g of urea?
A solution contains \(9.8 \, \text{g}\) of \(H_2SO_4\). How much NaOH is required to completely neutralize it? (molar mass of NaOH = \(40 \, \text{g mol}^{-1}\))
Which law is illustrated by compounds H$_2$O and H$_2$O$_2$ formed from two different elements, H and O?
Which of the following pairs of compounds cannot demonstrate the law of multiple proportions?
"A given compound always contains the same proportion of elements" is a statement of
What is the ratio of mass of nitrogen that combines with 16 parts by weight of oxygen in $\text{N}_2\text{O}, \text{NO}, \text{NO}_2$ ?
What is the percentage by mass of oxygen in water, if percentage by mass of hydrogen is \(11.1\%\) ?
What is the mass in gram of 1 atom of an element if its atomic mass is 10 u?
Which of the following pair of compounds demonstrates the law of multiple proportions?
At STP, 1.54 g of MnO\(_2\) reacted with excess HCl. What is the volume of Cl\(_2\) produced at STP? (At. wt: Mn = 55 u, O = 16 u)
How many litres of O\(_2\) at 273 K and 1 atm pressure can give 20 L of CO in the following reaction?
\[ C + O_2 \rightarrow CO_2 \rightarrow CO \]
\(PCl_5\) is well known, but \(NCl_5\) is not. Because,
What is the mass of potassium chloride produced when $12.25\ \mathrm{g}$ potassium chlorate undergoes decomposition? (Atomic masses: $\mathrm{K} = 39$, $\mathrm{Cl} = 35.5$, $\mathrm{O} = 16$)
How many moles of urea are present in 5.4 g ? (Molar mass = 60)
"Mass can neither be created nor destroyed" is the statement of