20.0 g of a magnesium carbonate sample d...

20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g magnesium oxide. What be the percentage purity of magnsesium carbonate in the sample?

A

60

B

84

C

75

D

96

Text Solution

Verified by Experts

The correct Answer is:

B

`MgCO_(3) (s) to MgO(s) + CO_(2)(g)`
40 g of MgO are produced from `MgCO_(3) = 84 g`
8 g of MgO are produced from `MgCO_(3) = 84/40 xx 9`
= 16.8 g
% Purity of `MgCO_(3) =(16.8)/20 xx 100`
= 84%

Promotional Banner

Promotional Banner

Topper's Solved these Questions

SOME BASIC CONCEPTS OF CHEMISTRY
MODERN PUBLICATION|Exercise COMPETITION FILE (MULTIPLE CHOICE QUESTIONS FROM COMPETITIVE EXAMINATIONS)(JEE MAIN & OTHER STATE BOARDS ENGINEERING ENTRANCE)|56 Videos
SOME BASIC CONCEPTS OF CHEMISTRY
MODERN PUBLICATION|Exercise COMPETITION FILE (MULTIPLE CHOICE QUESTIONS FROM COMPETITIVE EXAMINATIONS) (JEE ADVANCE FOR IIT ENTRANCE)|1 Videos
SOME BASIC CONCEPTS OF CHEMISTRY
MODERN PUBLICATION|Exercise COMPETITION FILE (MULTIPLE CHOICE QUESTIONS)|30 Videos
S-BLOCK ELEMENTS ( ALKALI AND ALKALINE EARTH METALS )
MODERN PUBLICATION|Exercise UNIT PRACTICE TEST|13 Videos
STATES OF MATTER : GASES AND LIQUIDS
MODERN PUBLICATION|Exercise UNIT PRACTICE TEST|13 Videos

Similar Questions

Explore conceptually related problems

20.0 g of magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g of magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample?

Metal carbonates decompose on heating to give metal oxide and carbon dioxide. Which of the metal carbonates is most stable thermally?

2.5 g of an impure sample of sodium bicarbonate when heated strongly gave 300 ml of carbon dioxide measured at 27^(@) C and 760 mm pressure. Calculate the percentage purity of the sample

Calculate the mass of carbon present in 2 g of carbon dioxide.

MODERN PUBLICATION-SOME BASIC CONCEPTS OF CHEMISTRY -COMPETITION FILE (MULTIPLE CHOICE QUESTIONS FROM COMPETITIVE EXAMINATIONS)(AIPMT, NEET & OTHER STATE BOARD MEDICAL ENTRANCE)

25.3 g sodium carbonate, Na(2)CO(3), was dissolved in enough water to ...
Text Solution
|
The number of atoms in 0.1 mol of a triatomic gas is:
Text Solution
|
Which one of the following sets of compounds correctly illustrate the ...
Text Solution
|
20.0 kg of N(2)(g) and 3.0 kg of H(2)(g) are mixed to produce NH(3)(g)...
Text Solution
|
What is the volutme of CO(2) liberted in litres at 1 atmosphere and 0^...
Text Solution
|
Which one of the following is the lightest ?
Text Solution
|
When 22.4 L of H(2)(g) is mixed with 11.2 of Cl(2)(g), each at STP, th...
Text Solution
|
1.0 g of magnesium is burnt with 0.56 g O(2) in a closed vessel. Which...
Text Solution
|
The mass of CaCO(3) required to react completely with 20 mL of 1.0 M H...
Text Solution
|
Which one of the following has maximum number of molecules ?
Text Solution
|
A mixture of gases contains H(2) and O(2) gases in the ratio of 1:4 (w...
Text Solution
|
If Avogadro number N(A) is changed from 6.022xx10^(23) mol^(-1) to 6.0...
Text Solution
|
The number of water molecules is maximum in
Text Solution
|
20.0 g of a magnesium carbonate sample decomposes on heating to give c...
Text Solution
|
What is the mole fraction of the solute in a 1.00 m aqueous...
Text Solution
|
What is the mass of the precipitate formed when 50 mL of 16.9% solutio...
Text Solution
|
Suppose the elements X and Y combine to form two compounds of XY(2) an...
Text Solution
|
Which of the following is dependent on temperature?
Text Solution
|
In which case is the number of molecules of water maximum?
Text Solution
|
The number of moles of hydrogen molecules required to produce 20 moles...
Text Solution
|