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Important compounds: NaOH, Na2CO3, NaHCO3, CaO, CaCO3, plaster of Paris

55 questions on Important compounds: NaOH, Na2CO3, NaHCO3, CaO, CaCO3, plaster of Paris from the s-Block Elements chapter: 11 NEET level, 22 JEE Main, 22 JEE Advanced. Each one opens with its answer and solution.

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In the Solvay process, ammonia is recovered from NH4Cl by treating it with NEET level
Gypsum, CaSO4*2H2O, when heated to about 393 K, gives NEET level
An aqueous solution of sodium carbonate is alkaline because NEET level
In the mercury cathode (Castner-Kellner) cell for the electrolysis of brine, the substance formed at the mercury cathode is NEET level
Lime water turns milky when carbon dioxide is passed through it for a short time. The milkiness is due to NEET level
The formula of washing soda is NEET level
The products formed on heating solid sodium hydrogencarbonate are NEET level
K2CO3 cannot be manufactured by the Solvay process because NEET level
When plaster of Paris is mixed with water in the right amount, it sets to a hard mass of NEET level
In a blast furnace, quicklime is added mainly to remove silica impurity as NEET level
Strong heating of limestone gives quicklime and NEET level
In the Solvay process, sodium hydrogencarbonate separates from the cold ammoniacal brine saturated with CO2 mainly because JEE Main level
Assuming that ammonia and carbon dioxide are fully recycled, the only waste by-product of the Solvay process is JEE Main level
Assertion (A): An aqueous solution of sodium carbonate turns red litmus blue. Reason (R): The sodium ion is hydrolysed in water to give hydroxide ions. JEE Main level
Match the compound in List I with a use or property in List II. List I: (P) NaOH; (Q) Na2CO3; (R) CaO; (S) plaster of Paris. List II: (1) fused with sand and li... JEE Main level
How many moles of water are lost per mole of gypsum, CaSO4*2H2O, when it is converted completely into plaster of Paris? JEE Main level
A solution containing 0.50 mol of NaOH absorbs exactly 0.50 mol of CO2 in water. The sodium compound formed is JEE Main level
Chlorine is passed into hot concentrated aqueous NaOH. The chlorine-containing products are JEE Main level
Aluminium is warmed with excess concentrated aqueous NaOH: 2Al + 2NaOH + 6H2O -> 2Na[Al(OH)4] + 3H2. The moles of hydrogen liberated per mole of aluminium are JEE Main level
Among BeCO3, MgCO3, CaCO3 and BaCO3, the carbonate with the lowest decomposition temperature is JEE Main level
Washing soda is added to water whose hardness is due to CaSO4. The calcium-containing solid that separates is JEE Main level
Carbon dioxide is passed continuously for a long time through clear lime water. The milkiness that first appears later disappears because JEE Main level
Which one of the following gases can be dried by passing it over solid quicklime? JEE Main level
Plaster of Paris is heated well above 473 K, but below the temperature at which sulfate decomposes. The product is JEE Main level
0.30 mol of NaOH and 0.20 mol of NaHCO3 are dissolved together in water. Sodium-containing species in the final solution (apart from Na+ counted as spectator) a... JEE Main level
25.0 mL of 0.100 M Na2CO3 is titrated with 0.100 M HCl using phenolphthalein as the indicator. The volume of HCl at the end point is JEE Main level
In the mercury cathode cell, sodium and not hydrogen is discharged at the cathode mainly because JEE Main level
Crystals of washing soda kept in dry air gradually become a white powder. This change is JEE Main level
Pure solid NaHCO3 weighing 25.0 g is heated until it is completely converted into Na2CO3 (atomic masses: Na 23, C 12, O 16, H 1). The total loss in mass of the ... JEE Main level
Which of the following statements about washing soda, Na2CO3*10H2O, are correct? JEE Main level
Which of the following give carbon dioxide on heating to about 1200 K in an open vessel (carbon dioxide may be accompanied by other products)? JEE Main level
Hydrogen gas is evolved when which of the following metals is warmed with concentrated aqueous NaOH? JEE Main level
Which of the following statements about calcium oxide are correct? JEE Main level
A white solid X, weakly alkaline in water (pH about 8), gives off a colourless gas that turns lime water milky and drops of a colourless liquid on gentle heatin... JEE Advanced level
Limestone is calcined to give a white solid A. A reacts with water to form B, a sparingly soluble base. B absorbs chlorine to form bleaching powder, CaOCl2 (rel... JEE Advanced level
100 mL of 0.200 M NaOH is left open to air and exactly 25.0% of the NaOH is converted into Na2CO3 by CO2. The solution is titrated with 0.100 M HCl using phenol... JEE Advanced level
Assertion (A): K2CO3 cannot be obtained by a process analogous to the Solvay process using KCl. Reason (R): KHCO3 is much more soluble in water than NaHCO3 and ... JEE Advanced level
Match the compound in List I with the statement in List II. List I: (P) CaCO3; (Q) Ca(OH)2; (R) NaHCO3; (S) CaSO4*2H2O. List II: (1) loses mass near 400 K, rele... JEE Advanced level
530 g of Na2CO3 is fully converted to NaOH by boiling with excess slaked lime, and all the NaOH is then treated with excess chlorine in hot concentrated solutio... JEE Advanced level
A 10.0 g mixture of NaHCO3 and Na2CO3 is heated strongly until the mass is constant and the solid loses 1.55 g. The percentage by mass of NaHCO3 in the mixture ... JEE Advanced level
A 12.5 g sample of impure limestone (the impurity is inert and non-volatile) is heated strongly and gives 2.24 L of CO2 measured at STP (molar volume 22.4 L/mol... JEE Advanced level
43.0 g of gypsum, CaSO4*2H2O, is heated at 393 K to give plaster of Paris quantitatively. The mass of water that must be added to set all the plaster to gypsum ... JEE Advanced level
1000 L of water contains Ca(HCO3)2 at 0.0100 mol/L and no other hardness. By Clark's method it is softened with the least amount of pure quicklime, which is fir... JEE Advanced level
A mercury cathode cell for brine electrolysis carries a steady current of 9650 A for 1.00 h with a current efficiency of 80.0% for sodium deposition. All the am... JEE Advanced level
A white crystalline solid A dissolves in water to give a solution that turns red litmus blue. Dilute HCl added to A gives a colourless, odourless gas that turns... JEE Advanced level
Which of the following correctly gives the order of thermal stability of the group 2 carbonates together with the reason? JEE Advanced level
In the Solvay process with complete recycling of NH3 and CO2, the mass of CaCl2 formed as by-product for every 106 g of Na2CO3 produced is (Ca 40, Cl 35.5) JEE Advanced level
In a Solvay plant all the CO2 obtained by calcining NaHCO3 is recycled, the rest of the CO2 comes from limestone (85.0% CaCO3 by mass, impurity inert), and all ... JEE Advanced level
Chlorine reacts with aqueous sodium hydroxide. Which of the following statements are correct? JEE Advanced level
Which of the following statements about the Solvay process are correct? JEE Advanced level
Which of the following statements about plaster of Paris are correct? JEE Advanced level
Which of the following conversions can be achieved in a single step? JEE Advanced level
Use pKa1 = 6.35 and pKa2 = 10.33 for H2CO3 at 298 K and pKw = 14. Which of the following statements about 0.10 M aqueous solutions are correct? JEE Advanced level
Limestone is heated strongly to give a gas X and a solid Y. Y is heated with coke at about 2300 K in an electric furnace to give a solid Z (and carbon monoxide)... JEE Advanced level
Atomic masses: Na 23, Ca 40, S 32, C 12, O 16, H 1. Which of the following statements about the percentage of initial mass lost on complete conversion are corre... JEE Advanced level