हिंदी

Give scientific reason. It is reccommended to use air tight container for storing oil for long time. - Science and Technology 1

Advertisements
Advertisements

प्रश्न

Give scientific reason.

It is reccommended to use air tight container for storing oil for long time.

स्पष्ट कीजिए
टिप्पणी लिखिए

उत्तर

  1. When edible oil is left aside for long time, it undergoes air oxidation.
  2. Due to this, the taste and smell of oil changes and it becomes rancid. If food is cooked in this oil, its taste also changes.
  3. Thus, the oil will become unfit for consumption.
  4. The process of oxidation reaction of oil can be slowed down by storing it in air tight container.
    Hence, it is recommended to use air tight container for storing oil for long time.
shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 3: Chemical reactions and equations - Write scientific reasons

APPEARS IN

एससीईआरटी महाराष्ट्र Science and Technology 1 [English] 10 Standard SSC
अध्याय 3 Chemical reactions and equations
Write scientific reasons | Q 2
बालभारती Science and Technology 1 [English] 10 Standard SSC Maharashtra State Board
अध्याय 3 Chemical reactions and equations
Exercise | Q 4. d. | पृष्ठ ४५

वीडियो ट्यूटोरियलVIEW ALL [2]

संबंधित प्रश्न

Which of the statements about the reaction below are incorrect?

\[\ce{2PbO(s) + C(s) → 2Pb(s) + CO2(g)}\]

  1. Lead is getting reduced.
  2. Carbon dioxide is getting oxidised.
  3. Carbon is getting oxidised.
  4. Lead oxide is getting reduced.

What is meant by rust?


Give an example of an oxidation reaction.


Define reduction in terms of gain or loss of hydrogen with one example.


Hydrogen burns with a ______ flame and ______ sound is heard.


Fill in the blank

In redox reaction oxidation and reduction occur ............................


Identify the substances that are oxidised and the substances that are reduced in the following reaction.

\[\ce{CuO(s) + H2(g) -> Cu(s) + H2O (l)}\]


Electrolysis is a redox process. Explain.


Compare hydrogen with alkali metals on the basis of:

Oxide formation 


Why this reaction is considered a reversible reaction?


State whether the following conversion is oxidation or reduction:

Cu2+ + 2 e-→ Cu 


Divide the following reactions into oxidation and reduction half-reaction:

Zn + Cu2+ → Cu + Zn 2+


Write the equation in the ionic form

CuSO4(aq)  + Fe(s)→ FeSO4(aq) + Cu(s)

 

 


Reacting with water, an active metal produces


Name: 

a substance that oxidizes concentrated HCl to chlorine.


Name: 

a liquid that is an oxidizing agent as well as a reducing agent.


Name:

a gas that is oxidizing as well as a reducing agent.


State a reason why, when hydrogen is passed over heated copper oxide, the resultant product formed, differs in colour from the original reactant.


Explain the term reduction in term of addition and removal of oxygen/hydrogen with a suitable example.


Oxidising agents are also called as ______ because they remove electrons form other substances.


Identify the reducing agent in the following reactions - 

`"H"_2"O" + "F"_2 -> "HF" + "HOF"`


Identify the reducing agent in the following reactions

`2"H"_2 + "O"_2 -> 2"H"_2"O"`


Identify the oxidising agent (oxidant) in the following reactions

`2"Mg" + "O"_2 -> 2"MgO"`


Which among the following are physical or chemical change?

Heating of an iron rod to red hot


Which among the following are physical or chemical change?

Curding of milk


During the reaction of some metals with dilute hydrochloric acid, following observations are made.

The temperature of the reaction mixture rises when aluminium (Al) is added.

Explain this observation giving suitable reason.


You are provided with two containers made up of copper and aluminium. You are also provided with solutions of dilute HCl, dilute HNO3, ZnCl2 and water. In which of the above containers, can these solutions be kept?


The sum of the oxidation number of all atoms in a compound is ______.


Choose the odd one out and write the reason:


Identify the following reactions as oxidation/reduction/redox reaction

Zn + CuSO4 → Cu + ZnSO4


Identify the following reactions as oxidation/reduction/redox reaction

CuO+H2 → Cu+H2O


What is rancidity?


Find the oxidation number of the element in the following compound.

Mg in MgO


Find the oxidation number of the element in the following compound.

N in NH3


When hydrogen gas is passed over black copper oxide, a reddish-coloured layer of copper is formed.

Answer the questions that follow based on this reaction.

  1. Write the equation.
  2. What type of reaction is it?
  3. Complete the blanks:
    In this reaction, an oxygen atom goes away from CuO (copper oxide), which means that ______ of copper oxide takes place, whereas a hydrogen molecule takes up an oxygen atom and water (H2O) is formed, meaning ______ of hydrogen takes place.

In the redox reaction:

MnO2 + 4HCl → MnCl2 + 2H2O + Cl2


State whether the given chemical reaction is a redox reaction or not. Justify your answer.

\[\ce{MnO_2 + 4HCl->MnCl_2 +2H_2O + Cl_2}\]


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×