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महाराष्ट्र राज्य शिक्षण मंडळएस.एस.सी (इंग्रजी माध्यम) इयत्ता १० वी

Balance the given chemical reaction as per the instructions below. NaOH+HX2SOX4⟶NaX2SOX4+HX2O Oxidation means losing electrons then what is reduction? - Science and Technology 1

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प्रश्न

Balance the given chemical reaction as per the instructions below.

\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]

Oxidation means losing electrons then what is reduction?

एका वाक्यात उत्तर
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उत्तर

Reduction is gain of electrons.

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पाठ 3: Chemical reactions and equations - Answer the following questions

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एससीईआरटी महाराष्ट्र Science and Technology 1 [English] 10 Standard SSC
पाठ 3 Chemical reactions and equations
Answer the following questions | Q 1.5

व्हिडिओ ट्यूटोरियलVIEW ALL [2]

संबंधित प्रश्‍न

Why does the colour of copper sulphate solution change when an iron nail is dipped in it?


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.

 Explain the following in term Oxidation of gain or loss of oxygen with two example.


What are anti-oxidants? Why are they added to fat and oil containing foods?


In the reaction represented by the equation:

MnO2 + 4HCl → MnCl2 + 2H2O + Cl2

(i) name the substance oxidised.
(ii) name the oxidising agent.
(iii) name the substance reduced.
(iv) name the reducing agent.

 


Give an example of an oxidation reaction.


Explain reduction in terms of gain or loss of oxygen 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.


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


Fill in the blank

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


Indicate which of the following statement is true and which is false:

The removal of hydrogen from a substance is called reduction.


Name the following:

The process in which oxygen is added or hydrogen is removed.


How would you change a metal like Cu into its ions?


Give scientific reason.

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


In what respect does hydrogen differ from:

alkali metals


Give the general group study of hydrogen with reference to

burning


Is it essential that oxidation and reduction must occur side by side in a chemical reaction? Explain


State, giving reason, whether the substances printed in bold letters have been oxidized or reduced.

PbO + CO → Pb + CO2


State whether the following conversion is oxidation or reduction:

K → K+ + e- 


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

Zn + Pb2+→ Pb + Zn 2+


Write the equation in the ionic form

CuSO4(aq)  + Fe(s)→ FeSO4(aq) + Cu(s)

 

 


A metal oxide that is reduced by hydrogen is


Which of the following statements about hydrogen is incorrect?


Choose terms from the options given in brackets to complete this sentence.

When CuO reacts with hydrogen,………………… is reduced and ……………….is oxidized to ………………….

(CuO, H2, Cu, H2O)

 


Name:

an oxidizing agent that does not contain oxygen.


Name: 

a substance that oxidizes concentrated HCl to chlorine.


Name:

a substance that will reduce aqueous Iron(III)ions to iron(II)ions.


Name: 

a solid that is an oxidizing agent. 


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.


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


State what is reducing agent. Give an example of oxidising agent in the gaseous, liquid, and solid form.


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


Identify the following reactions as oxidation or reduction

  1. Na → Na+ + e
  2. Fe3+ + 2 e- → Fe+

In the reaction of iron with copper sulphate solution:

CuSO4 + Fe → Cu + FeSO4

Which option in the given table correctly represents the substance oxidized and the reducing agent?

OPTION Substance Oxidized Reducing Agent
A Fe Fe
B Fe FeSO4
C Cu Fe
D CuSO4 Fe

Identify the reducing agent in the following reactions

`"Fe"_2"O"_3 + 3"CO" -> 2"Fe" + 3"CO"_2`


Identify the oxidising agent (oxidant) in the following reactions

`"CuSO"_4 + "Zn" -> "Cu" + "ZnSO"_4`


Grapes hanging on the plant do not ferment but after being plucked from the plant can be fermented. Under what conditions do these grapes ferment? Is it a chemical or a physical change?


Which among the following are physical or chemical change?

 Evaporation of petrol


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

Silver metal does not show any change

Explain this observation giving suitable reason.


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

CuO+H2 → Cu+H2O


Identify the following reactions as oxidation/reduction/redox reaction

2Mg +O2 → 2MgO


What are redox reactions? Give examples.


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


The oxidizing agent in the equation \[\ce{S + 2H2SO4 -> 3SO2 + 2H2O}\] is ______.


The metallic oxide which can be reduced by using common reducing agents is ______.


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