Question

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

Solution

Correct option is

32

 

20 g of oxygen combine with metal = 80 g

                  

∴By definition, equivalent wt. of metal=32.

SIMILAR QUESTIONS

Q1

How many moles of magnesium phosphate, Mg3(PO4)2 will contain 0.25 mole of oxygen atoms?

Q2

The decomposition of a certain mass CaCO3 gave 11.2 dm3 of CO2 gas at STP. The mass of KOH required to completely neutralize the gas is 

Q3

1.520 g of hydroxide of a metal on ignition gave 0.995 g of oxide. The equivalent weight of the metal is 

Q4

The number of g-atom of oxygen in  CO molecules is

Q5

500 mL of NH3 contain  molecules at S.T.P. How many molecules are present in 100 mL of CO2 at S.T.P.? 

Q6

 

In the reaction, 4 NH3 + 5 O2 → 4 NO + 6 H2O,

when one mole of ammonia and one mole of oxygen are made to react to completion, then

Q7

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

Q8

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

Q9

 

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.

Q10

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)