Two gas samples were analysed, one of them contains 1.2 g of C and 3.2 g of O. The other contained 27.3% Cm and 72.72% of O approximately. The experiment data are in accord with
Amount of oxygen required for combustion of 1 kg of a mixture of butane and isobutane is
A compound contains 8% sulphur. The minimum molecular weight of the compound is
Which of the following has the smallest number of molecules?
Number of electrons present in 3.6 mg of NH4+ are
A sample of CaCO3 has Ca = 40%, C = 12% & O = 48%. If the law of constant proportions is true , then the mass of Ca in 5g of CaCO3 from another source will be
One amu is
The number of molecules present in a drop of water, if its volume is 0.045 mL, are
A hydrate of Na2SO3 losses 22.2% of H2O by mass on strong heating. The hydrate is
How many moles of magnesium phosphate, Mg3(PO4)2 will contain 0.25 mole of oxygen atoms?
If NA is Avogadro’s number, then number of valence electrons in 4.2 g of nitride ions (N3–)
The maximum number of molecules are present in
2 moles of H2S and 11.2 L of SO2 at NTP, react to form X mole of sulphur. X is
The weight of 1 mole of a gas of density 0.1784 g/L at NTP is
The law of multiple proportions is illustrated by the two compounds
For the formation of 3.65 g of hydrogen chloride gas, what volumes of hydrogen gas and chlorine gas are required at NTP conditions ?
The total number of protons, electrons and neutrons in 12 g of C12 is
What volume of hydrogen will be liberated at NTP by the reaction of Zn on 50 ml of dilute H2SO4 of density 1.3/ml and having purity 40% ?
The number of H+ ions present in 100 mL of 0.001 M H2SO4 solution is
The amount of wet NaOH containing 20% water by mass required to neutralise 6 litre of 0.5 M H2SO4 solution is