2.76 g of silver carbonate on being strongly heated yields a residue weighing


Correct option is

2.16 g


Unlike other metal carbonates that usually decomposes into metal oxides liberating carbon dioxide, silver carbonate on heating decomposes into elemental silver liberating mixture of carbon dioxide and oxygen gas as


                    MW = 276g               2 × 108 = 216 g 

Hence, 2.76 g of Ag2CO3 on heating will give  




An unknown element forms an oxide. What will be the equivalent weight of the element if the oxygen content is 20% by weight? 


A metal M of equivalent mass E forms an oxide of molecular formulaMxOy. The atomic mass of the metal is given by the correct equation


Which of the following methods of expressing concentration are independent of temperature?



Pressure is determined as force per unit area of the surface. The S.I unit of pressure, pascal, is as shown below:

                               1Pa = 1 Nm–2

 If mass of air at sea level is 1034g cm-2, calculate the pressure in pascal.


Determine the molecular formula of an oxide of iron in which the mass percent of iron and oxygen are 69.9 and 30.1 respectively. Given that the molar mass of the oxide is  (Atomic mass: Fe = 55.85, O = 16.00 amu)


A gaseous mixture contains oxygen and nitrogen in the ratio of 1:4 by weight. Therefore, the ratio of their number of molecules is


The total number of electrons in one molecule of carbon dioxide is


The largest number of molecules is in


When the same amount of zinc is treated separately with excess ofsulphuric acid and excess of sodium hydroxide, the ratio of volumes of hydrogen evolved is


If 0.50 mole of BaCl2 is mixed with 0.20 mole of Na3PO4, the maximum number of moles of Ba(PO4)2 that can be formed is