- Trending Categories
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
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide (black), oxygen gas and a brown gas X is formed
(a) Write a balanced chemical equation of the reaction.
(b) Identity the brown gas X evolved.
(c) Identify the type of reaction.
(d) What could be the pH range of aqueous solution of the gas X?
(a) The balanced equation is given below:
$2Cu (NO_{3})_{2}(s)\overset{heat}{\rightarrow} 2CuO(s)+4NO_{2}(g)+O_{2}(g)$\
(b) The brown gas X= NO2 (Nitrogen dioxide) is released.
(c) On heating blue coloured powder of copper (II) nitrate in a boiling tube, black copper oxide, O2, and a brown gas X is formed. Hence, it is a Decomposition Reaction.
(d) pH range of aqueous solution of the gas X= NO2 is between 0 to 7 i.e., acidic pH range, NO2 when dissolved in water gives Nitric acid (HNO3).
(Refer image for better understanding)
( The pH of a solution is a measure of the molar concentration of hydrogen ions in the solution and as such is a measure of the acidity or basicity of the solution.
The letters pH stand for "power of hydrogen" and the numerical value for pH is just the negative of the power of 10 of the molar concentration of H+ ions.)
- Related Articles
- On heating blue coloured powder of copper (II) nitrate in a boiling tube, black copper oxide, O2 and a brown gas X is formed.(a) Identify the type of reaction and gas X.(b) Write the balanced chemical equation of the reaction.(c) Write the pH range of the aqueous solution of the gas X.
- A gas is evolved when ethanol reacts with sodium. Name the gas evolved and also write the balanced chemical equation of the reaction involved.
- What happens when ferrous sulphate crystals are heated?(a) A gas having the smell of burning sulphur is evolved(b) No gas is evolved(c) Brown coloured gas is evolved(d) Colourless and odourless gas is evolved.
- When zinc metal is treated with a dilute solution of a strong acid, a gas is evolved, which is utilised in the hydrogenation of oil. Name the gas evolved. Write the chemical equation of the reaction involved and also write a test to detect the gas formed.
- On adding dilute hydrochloric acid to copper oxide powder, the solution formed is blue-green.(a) Predict the new compound formed which imparts a blue-green colour to solution.(b) Write a balanced chemical equation of the reaction which takes place.(c) On the basis of the above reaction, what can you say about the nature of copper oxide?
- A salt X is formed and a gas is evolved when ethanoic acid reacts with sodium hydrogen carbonate. Name the salt X and the gas evolved. Describe an activity and draw the diagram of the apparatus to prove that the evolved gas is the one which you have named. Also, write a chemical equation of the reaction involved.
- 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.
- A red-brown metal X forms a salt XSO4. When hydrogen sulphide gas is passed through an aqueous solution of XSO4, then a black precipitate of XS is formed along with sulphuric acid solution.(a) What could the salt XSO4 be?(b) What is the colour of salt XSO4?(c) Name the black precipitate XS.(d) By using the formula of the salt obtained in (a) above, write an equation of the reaction which takes place when hydrogen sulphide gas is passed through its aqueous solution.(e) What type of chemical reaction takes place in this case?
- When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. The reaction is an example of a :Combination reactionDisplacement reactionDecomposition reactionDouble displacement reaction
- 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.
- You might have noted that when copper powder is heated in a china dish, the reddish brown surface of copper powder becomes coated with a black substance.(a) Why has this black substance formed?(b) What is this black substance?(c) Write the chemical equation of the reaction that takes place.(d) How can the black coating on the surface be turned reddish brown?
- A shiny brown coloured element ‘X’ on heating in the air becomes black in colour. Name the element ‘X’ and the black coloured compound formed.
- Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over the burning sulphur.What will be the action of this gas on:Dry litmus paper?Moist litmus paper?Write a balanced chemical equation for the reaction taking place.
- When a black metal compound XO is heated with a colourless gas Y2, then metal X and another compound Y2O are formed. Metal X is red-brown in colour which does not react with dilute acids at all. Gas Y2 can be prepared by the action of a dilute acid on any active metal. The compound Y2O is a liquid at room temperature which can turn anhydrous copper sulphate blue.(a) What do you think is metal X?(b) What could be gas Y2?(c) What is compound XO?(d) What is compound Y2O?(e) Write the chemical equation of the reaction which takes place on heating XO with Y2.(f) What type of chemical equation is illustrated in the above equation?
- Ferrous sulphate decomposes with the evolution of a gas having a characteristic odour of burning sulphur. Write the chemical reaction involved and identify the type of reaction.
Advertisements