English

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

Advertisements
Advertisements

Question

Give scientific reason.

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

Explain
Short Note

Solution

  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
  Is there an error in this question or solution?
Chapter 3: Chemical reactions and equations - Write scientific reasons

APPEARS IN

SCERT Maharashtra Science and Technology 1 [English] 10 Standard SSC
Chapter 3 Chemical reactions and equations
Write scientific reasons | Q 2
Balbharati Science and Technology 1 [English] 10 Standard SSC Maharashtra State Board
Chapter 3 Chemical reactions and equations
Exercise | Q 4. d. | Page 45

RELATED QUESTIONS

The chemical formula for rust is.............. .


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.

Define corrosion.


Fill in the following blanks with suitable words:

The addition of oxygen to a substance is called ......... whereas removal of oxygen is called ........


When a magnesium ribbon burns in air with a dazzling flame and forms a white ash, is magnesium oxidised or reduced? Why?


Give one example of an oxidation-reduction reaction which is also a combination reaction.


Explain oxidation in terms of gain or loss of oxygen with one example.


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


When a magnesium ribbon is heated, it burns in air to form magnesium oxide. Write a balanced chemical equation for this reaction. Name (i) substance oxidised, and (ii) substance reduced.


In the reaction represented by the following equation: 

CuO (s) + H2 (g) → Cu (s) + H2O (1)

(a) name the substance oxidised
(b) name the substance reduced
(c) name the oxidising agent
(d) name the reducing agent


Fill in the blank

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


Define oxidation.


The electron releasing tendency of zinc is ______ than that of copper. 


The colours of aqueous solutions of CuSO4 and FeSO4 as observed in the laboratory are:

(A) pale green and light blue respectively

(B) light blue and dark green respectively

(C) dark blue and dark green respectively

(D) dark blue and pale green respectively


Identify from the reaction the reactants that undergo oxidation and reduction.

2Mg + O2 → 2MgO


State whether the following conversion is oxidation or reduction:

Cu2+ + 2 e-→ Cu 


Divide the above equation into oxidation and reduction half-reactions.


Name:

an oxidizing agent that does not contain oxygen.


Complete and balance the following equation:

Zn +_________________→ZnCl2 + H2 


Distinguish between oxidation and reduction.

With reference to oxidation & reduction reaction – complete the statement given by filling in the blanks with only the words (a) Addition (b) Removal.

‘Oxidation is a chemical reaction involving ____ of oxygen to a substance or ____ of hydrogen from a substance. Reduction on the otherhand involves ____ of hydrogen to a substance or ____ of oxygen from a substance.


State the condition and give balanced equation for the conversion of coke to water gas.


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


Explain the term redox reaction with an example involving the reaction of hydrogen sulphide with chlorine.


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


Which of the following statements about the given reaction are correct?

\[\ce{3Fe_{(s)} + 4H2O_{(g)} -> Fe3O4_{(s)} + 4H2_{(g)}}\]

(i) Iron metal is getting oxidised.

(ii) Water is getting reduced.

(iii) Water is acting as the reducing agent.

(iv) Water is acting as oxidising agent.


Oxidation is a process which involves ____________.


\[\ce{MnO2 + 4HCl -> + 2H2O + Cl2}\]

Identify the substance oxidized in the above equation.


Identify the reducing agent in the following reactions

`4"NH"_3 + 5"O"_2 -> 4"NO" + 6"H"_2"O"`


Identify the oxidising agent (oxidant) in the following reactions 

`"Pb"_3"O"_4 + 8"HCl" -> 3"PbCl"_2 + "Cl"_2 + 4"H"_2"O"`


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

The reaction of sodium metal is found to be highly explosive

Explain this observation giving suitable reason.


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

Some bubbles of a gas are seen when lead (Pb) is reacted with the acid.

Explain this observation giving suitable reason.


Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid whereas copper does not. Explain why?


The tendency of atoms to have eight electrons in the outer shell is known as ______.


Choose the odd one out and write the reason:


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

Ca in CaH2


It is recommended to use air tight containers for storing oil for a long time.


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×