मराठी

Explain the following: Bubbles are produced when acetic acid is added to a solution of sodium hydrogencarbonate. - Science

Advertisements
Advertisements

प्रश्न

Explain the following:

Bubbles are produced when acetic acid is added to a solution of sodium hydrogencarbonate. 

टीपा लिहा

उत्तर

 When acetic acid is added to a solution of sodium hydrogen carbonate, carbon dioxide gas is formed which comes out in the form of bubbles.

Sodium hydrogen carbonate + Acetic acid → Sodium carbonate + Water + Carbon dioxide

shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 6: Physical and Chemical Changes - VERY SHORT ANSWER QUESTIONS [पृष्ठ ३६]

APPEARS IN

एनसीईआरटी एक्झांप्लर Science [English] Class 7
पाठ 6 Physical and Chemical Changes
VERY SHORT ANSWER QUESTIONS | Q 18. (b) | पृष्ठ ३६

संबंधित प्रश्‍न

Which of the following methods is suitable for preventing an iron frying pan from rusting?


Explain why, through aluminium is more reactive than iron, yet there is less corrosion of aluminium when both are exposed to air.


Brass is an alloy of:
(a) Cu and Sn
(b) Cu and Pb
(c) Pb and Sn
(d) Zn and Cu


Four metals P, Q, R and S are all obtained by the reduction of their oxides with carbon. Metal P is used to form a thin layer over the sheets of metal S to prevent its corrosion. Metal Q is used for electroplating tiffin boxes made of metal S whereas metal R is used in making car batteries. Metals Q and R form an alloy called solder. What are metals P, Q, R and S? How have you arrived at this conclusion?


Complete the process of iron rusting by filling the blanks. Suggest a way to prohibit the process.
The iron rust is formed due to........................... reaction. Different
regions on iron surface become anode and cathode.
 Reaction on anode region :

`F_e(s) → Fe^(2+) (aq) +2e^-`

 Reaction on anode region :

`O_2(g) + 4H^+(aq) +............................ → 2H_2 O (l) `

When Fe2+ ions migrate from anode region they react with ................... to form Fe3+ ions.
A reddish coloured hydrated oxide is formed from ............... ions. It is called rust.

`2Fe_(3+) (aq) + 4H_2O(l) → ................. + 6H_+(aq) `

A way to prevent rusting ..................................................................

 

 


What are the adverse effects of corrosion?


State whether the statement given below is true or false. If false write the correct statement.

Graphite is a lustrous non-metal which conducts electricity.


When one of the metals in an alloy is mercury the alloy is called _______.


Find the odd one out and give its explanation.


Observe the following figure and write the answer of the question.

  1. Which process is shown in the figure?
  2. Explain the chemical reaction shown in the figure.
  3. Write the reactions on anode and cathode.

Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×