When a piece of limestone reacts with dilute HCl, a gas X is produced. When gas X is passed through water, then a white precipitate Y is formed. On passing excess of gas X, the white precipitate dissolves forming a soluble compound Z.(a) What are X, Y and Z?(b) Write equations for the reactions which takes place:
(i) when limestone reacts with dilute HCl
(ii) when gas X reacts with limewater to form white precipitate Y.
(iii) when excess gas X dissolves white precipitate Y to form a soluble compound Z.
(a) X is carbon dioxide
Y is calcium carbonate
Z is calcium hydrogen carbonate.
(b) (i) when limestone reacts with dilute HCl
$CaCO_3 + 2HCl → CaCl_2 +H_2O +CO_2(g)$
(ii) when gas X(carbon dioxide) reacts with limewater to form white precipitate Y (calcium carbonate).
$Ca(OH)_2(aq) + CO_2(g) → CaCO_3(s) + H_2O(l)$
(iii) when excess gas X (carbon dioxide) dissolves white precipitate Y (calcium carbonate) to form a soluble compound Z ( calcium hydrogen carbonate)
$CaCO_3(s) + CO_2(g) + H_2O(l) → Ca(HCO_3)_2(aq)$
Related Articles
- The metal X reacts with dilute hydrochloric acid to form a gas Y. The metal X also reacts with sodium hydroxide solution (on heating) to form the same gas Y. When a lighted matchstick is applied, this gas burns by producing a ‘pop’ sound.(a) Name two metals which could behave like X(b) Name the gas Y
- A silvery-white metal X taken in the form of ribbon, when ignited, burns in air with a dazzling white flame to form a white powder Y. When water is added to powder Y, it dissolves partially to form another substance Z.(a)What could metal X be? (b) What is powder Y? (c) With which substance metal X combines to form powder Y? (d) What is substance Z? Name one domestic use of substance Z? (e)Write a balanced chemical equation of the reaction which takes place when metal X burns in air to form powder Y.
- Hydrochloric acid reacts with a metal X to form a gas Y which burns with a ‘pop’ sound. Sodium hydroxide solution also reacts with the same metal X (on heating) to form the same gas Y.(a) Name X and Y(b) Write the chemical equation of the reaction of metal X with (i) Hydrochloric acid, and (ii) Sodium hydroxide solution.
- A metal carbonate X on reacting with acid gives a gas which when passed through a solution Y gives the carbonate back. On the other hand, a gas G that is obtained at the anode during electrolysis of brine is passed on dry Y, and it gives a compound Z, used for disinfecting drinking water. Identity X, Y, G and Z.
- When a mixture of gas X and Y is compressed to 300 atm pressure and then passed over a catalyst consisting of a mixture of zinc oxide and chromium oxide (heated to a temperature of 300OC), then an organic compound Z having the molecular formula CH4O is formed. X is a highly poisonous gas which is formed in appreciable amounts when a fuel burns in limited supply of air; Y is a gas which can be made by the action of dilute acid on an active metal, and Z is a liquid organic compound which can react with sodium metal to produce hydrogen gas.(a) What are X, Y, and Z.(b) Write a balanced chemical equation of the reaction which takes place when X and Y combine to form Z. Indicate the conditions in which the reaction occurs.
- A compound 'X' on heating with excess conc. sulphuric acid at 443 K gives an unsaturated compound 'Y'. 'X ' also reacts with sodium metal to evolve a colorless gas 'Z'. Identify 'X ', 'Y' and 'Z'. Write the equation of the chemical reaction of formation of 'Y', and also write the role of sulphuric acid in the reaction.
- A four carbons atoms containing neutral organic compound X reacts with sodium metal to evolve a gas which burns with 'pop' sound. Another four carbon atoms containing carbon compound reacts with sodium hydrogen carbonate to evolve a gas which turns lime water milky. When compounds X and Y are heated together in the presence of a little of concentrated sulphuric acid, then a new compound Z is formed.(a) What is compound X ? Also write its formula. (b) What is compound Y ? Also write its formula. (c) What is compound Z ? Also write its formula. (d) What type of smell is given by compound Z? (e) What is the general name of compounds like Z? (f) What is the general name of the reaction which takes place between X and Y to form Z?
- Name the gas evolved when a metal reacts with a dilute acid.
- Identify ‘x’, ‘y’ and ‘z’ in the following reaction : $2KClO_3 (x) \xrightarrow{(y)} 2 KCl (x) + O_2(z)$(a) x = gas ; y = reaction condition, z = gas (b) x = solid ; y = liquid; z = gas (c) x = number of moles of KClO3 ; y = reaction condition; z = no. of molecules of oxygen. (d) x = physical state of KClO3 and KCl; y = reaction condition; z = physical state of O2.
- The incomplete combustion of firewood in homes produces a very poisonous gas X. When inhaled, gas X combines with the substance Y present in blood and reduces the capacity of blood to carry gas Z causing respiratory problems and suffocation. What are X, Y and Z?
- Compound A, when dissolved in water, gives compound B which is used in whitewashing. Compound B reacts with carbon dioxide to form a white precipitate of compound C. Identify compounds A, B and C. Also write the equations involved.
- Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute H2SO4.
- A substance X which is used as an antacid reacts with dilute hydrochloric acid to produce a gas Y which is used in one type of fire-extinguisher. Name the substance X and gas Y. Write a balanced equation for the chemical reaction which takes place.
- Name the gas evolved when dilute HCl reacts with sodium hydro-carbonate. How is it recognized?
- A liquid compound X of molecular mass 18 u can be obtained from a number of natural sources. All the animals and plants need liquid X for their survival. When an electric current is passed through 200 grams of pure liquid X under suitable conditions, then 178 grams of gas Y and 22 grams of gas Z are produced. Gas Y is produced at the positive electrode whereas gas Z is obtained at the negative electrode. moreover, gas Y supports combustion whereas gas Z burns itself causing explosions.(a) Name (i) liquid X (ii) gas Y, and (iii) gas Z.(b) What is the ratio of the mass of element Z to the mass of element Y in the liquid X?(c) Which law of chemical combination is illustrated by this example ?(d) Name two sources of liquid X.(e) State an important use of Y in our life.
Kickstart Your Career
Get certified by completing the course
Get Started
Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies