Every question from past board papers on Atomic and molecular masses, mole concept, molar mass, newest paper first. Open any question for its full worked answer.
Among the following, choose the ones with equal number of atoms.
A. 212 g of \(\mathrm{Na_2CO_3}\) (s) [molar mass = 106 g]
B. 248 g of \(\mathrm{Na_2O}\) (s) [molar mass = 62 g]
C. 240 g of NaOH (s) [molar mass = 40 g]
D. 12 g of \(\mathrm{H_2}\) (g) [molar mass = 2 g]
E. 220 g of \(\mathrm{CO_2}\)(g) [molar mass = 44 g]
Choose the correct answer from the options given below :
The highest number of helium atoms is in
Which one is not correct mathematical equation for Dalton's Law of partial pressure ? Here \(p\) = total pressure of gaseous mixture
A 10.0 L flask contains 64 g of oxygen at 27°C. (Assume \(O_2\) gas is behaving ideally). The pressure inside the flask in bar is
(Given R = 0.0831 L bar \(K^{-1}\) \(mol^{-1}\))
Copper crystallises in fcc unit cell with cell edge length of \(3.608 \times 10^{-8}\) cm. The density of copper is 8.92 g \(cm^{-3}\). Calculate the atomic mass of copper.
Tritium, a radioactive isotope of hydrogen, emits which of the following particles ?
Choose the correct option for the total pressure (in atm.) in a mixture of 4 g \(O_2\) and 2 g \(H_2\) confined in a total volume of one litre at \(0^\circ C\) is :
[Given R=0.082 L atm mol\(^{-1}\)K\(^{-1}\), T=273 K]
Which one of the followings has maximum number of atoms ?
In which case is the number of molecules of water maximum ?
Lithium has a bcc structure. Its density is \(530\ kg\ m^{-3}\) and its atomic mass is \(6.94\ g\ mol^{-1}\). Calculate the edge length of a unit cell of Lithium metal. (\(N_A = 6.02\times10^{23}\ mol^{-1}\))
Equal moles of hydrogen and oxygen gases are placed in a container with a pin-hole through which both can escape. What fraction of the oxygen escapes in the time required for one-half of the hydrogen to escape ?
Suppose the elements X and Y combine to form two compounds \(XY_2\) and \(X_3Y_2\). When \(0.1\) mole of \(XY_2\) weighs \(10\) g and \(0.05\) mole of \(X_3Y_2\) weighs \(9\) g, the atomic weights of X and Y are
