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Which is more stable : Na(2)CO(3) or CaC...

Which is more stable : `Na_(2)CO_(3)` or `CaCO_(3)`?

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To determine which compound is more stable between Na₂CO₃ (sodium carbonate) and CaCO₃ (calcium carbonate), we need to analyze the properties of the cations involved and their effect on the stability of the carbonate ion. ### Step-by-Step Solution: 1. **Identify the Cations**: - In Na₂CO₃, the cation is Na⁺ (sodium ion). - In CaCO₃, the cation is Ca²⁺ (calcium ion). ...
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A water is said to be soft water if it produces sufficient foam with the soap and water that does not produce foam with soap is known as hard water. Hardness has been classified into two types (i)Temporary hardness (ii) Permanent hardness. Temporary hardness is due to presence of calcium and magnesium bicarbonate. It is simply removed by boiling as Ca(HCO_(3))_(2)overset(Delta)rarr CaCO_(3)darr+CO_(2)uarr+H_(2)O Mg(HCO_(3))_(2)overset(Delta)rarr MgCO_(3)darr+CO_(2)uarr+H_(2)O temporary hardness can also be removed by addition of slaked lime, Ca(OH)_(2) Ca(HCO_(3))_(2)+Ca(OH)_(2) to 2CaCO_(3)darr+2H_(2)O permanent hardsness is due to presencce of sulphates and chlorides of Ca,Mg,etc. It is removed by washing soda as CaCl_(2)+Na_(2)CO_(3) to CaCO_(3)darr+2NaCl CaSO(4)+Na_(2)CO_(3)to CaCO_(3)darr+Na_(2)SO_(4) Permanent hardness also removed by ion exchange resin process as 2RH+Ca^(2+)toR_(2)Ca+2H^(+) 2ROH+SO_(4)^(2-) to R_(2)SO_(4)+2OH^(-) The degree of hardness of water is measured in terms of PPm of CaCO_(3) 100 PPm means 100 g of CaCO_(3) is present in 10^(6) g of H_(2)O . If any other water sample which contain 120 PPm of MgSO_(4) , hardness in terms of CaCO_(3) is equal to =100 PPm. One litre of a sample of hard water (d=1 g/mL) cotains 136 mg of CaSO_(4) and 190 mg of MgCl_(2) . What is the total hardness of water in terms of CaCO_(3) ?

A 4.0 g of mixture of Na_(2)CO_(3) and NaHCO_(3) loses 0.248 g when heated to 300^@C , the temperature at which NaHCO_(3) decomposes to Na_(2)CO_(3), CO_(2) and H_(2) O . What is the percentage of Na_(2) CO_(3) in mixture?

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A water is said to be soft water if it produces sufficient foam with the soap and waterthat does not produce foam with soap is known as hard water. Hardness has been classified into two types (i)Temporary hardness (ii) Permanent hardness. Temporary hardness is due to presence of calcium and magnesium bicarbonate. It is simply removed by boiling as Ca(HCO_(3))_(2)overset(Delta)rarr CaCO_(3)darr+CO_(2)uarr+H_(2)O Mg(HCO_(3))_(2)overset(Delta)rarr MgCO_(3)darr+CO_(2)uarr+H_(2)O temporary hardness can also be removed by addition of slaked lime, Ca(OH)_(2) Ca(HCO_(3))_(2)+Ca(OH)_(2)to2CaCO_(3)darr+2H_(2)O permanent hardsness is due to presencce of sulphates and chlorides of Ca,Mg,etc. It is removed by washing soda as CaCl_(2)+Na_(2)CO_(3)toCaCO_(3)darr+2NaCl CaSO(4)+Na_(2)CO_(3)to CaCO_(3)darr+Na_(2)SO_(4) Permanent hardness also removed by ion exchange resin process as 2RH+Ca^(2+)toR_(2)Ca+2H^(+) 2ROH+SO_(4)^(2-)toR_(2)SO_(4)+2OH^(-) The degree of hardness of water is measured in terms of PPm of CaCO_(3) 100 PPm means 100 g of CaCO_(3) is present in 10^(6) g of H_(2)O . If any other water sample which contain 120 PPm of MgSO_(4) , hardness in terms of CaCO_(3) is equal to =100 PPm. A 200 g sample of hard water is passed through the column of cation exchange resin, in which H^(+) is exchanged by Ca^(2+) .The outlet water of column required 50mL of 0.1 M NaOH for complete neutralization.What is the hardness of Ca^(2+) ion in PPm?

A water is said to be soft water if it produces sufficient foam with the soap and water that does not produce foam with soap is known as hard water. Hardness has been classified into two types (i)Temporary hardness (ii) Permanent hardness. Temporary hardness is due to presence of calcium and magnesium bicarbonate. It is simply removed by boiling as Ca(HCO_(3))_(2)overset(Delta)rarr CaCO_(3)darr+CO_(2)uarr+H_(2)O Mg(HCO_(3))_(2)overset(Delta)rarr MgCO_(3)darr+CO_(2)uarr+H_(2)O temporary hardness can also be removed by addition of slaked lime, Ca(OH)_(2) Ca(HCO_(3))_(2)+Ca(OH)_(2)to2CaCO_(3)darr+2H_(2)O permanent hardsness is due to presencce of sulphates and chlorides of Ca,Mg,etc. It is removed by washing soda as CaCl_(2)+Na_(2)CO_(3)toCaCO_(3)darr+2NaCl CaSO(4)+Na_(2)CO_(3)to CaCO_(3)darr+Na_(2)SO_(4) Permanent hardness also removed by ion exchange resin process as 2RH+Ca^(2+) to R_(2)Ca+2H^(+) 2ROH+SO_(4)^(2-)toR_(2)SO_(4)+2OH^(-) The degree of hardness of water is measured in terms of PPm of CaCO_(3) 100 PPm means 100 g of CaCO_(3) is present in 10^(6) g of H_(2)O . If any other water sample which contain 120 PPm of MgSO_(4) , hardness in terms of CaCO_(3) is equal to =100 PPm. What is the mass of Ca(OH)_(2) required for 10 litre of water remove temporary hardness of 100 PPm due to Ca(HCO_(3))_(2) ?

ICSE-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-VERY SHORT ANSWER TYPE QUESTIONS
  1. How many groups are present in the long form of the periodic table?

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  2. Which periods are short and which are long in the periodic table and h...

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  3. Name the orbitals which get filled in moving from left to right in fou...

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  4. what is the general electronic configuration of the elements off-block...

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  5. Which groups constitute the d- block in the periodic table ?

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  6. Define atomic radius of an atom.

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  7. Why is van der Waals' radius of an atom greater than its covalent radi...

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  8. State the following: How do the atomic radii change in a period with...

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  9. Give reasons why? The size of cation is smaller than the size of par...

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  10. Give the formula of one species positively charged and one negatively ...

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  11. Among IE(1), IE(2), IE(3) of an element, which is the largest ? Arrang...

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  12. Among s, p, d and f subshells of the same shell, which has the highest...

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  13. How does ionisation energy vary in a group in the periodic table?

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  14. Give one word or a phrase for the following statement: The energy ...

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  15. Name the elements which possess most negative values of electron gain ...

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  16. Why does LiCI have a lower M.P. than NaCl ?

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  17. Which is more basic : LiOH or NaOH ?

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  18. Which is more stable : Na(2)CO(3) or CaCO(3)?

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  19. Which of the following are not representative elements ? Li, K, Al, ...

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  20. Which is more soluble in water : CaSO(4) or SrSO(4)?

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