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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?

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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 [पृष्ठ ५०]

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एससीईआरटी महाराष्ट्र Science and Technology Part 1 [English] Standard 10 Maharashtra State Board
पाठ 3 Chemical reactions and equations
Answer the following questions | Q 1 (E) | पृष्ठ ५०

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संबंधित प्रश्‍न

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


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


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


Why is photosynthesis considered an endothermic reaction?


In the following reaction between lead sulphide and hydrogen peroxide:

\[\ce{PbS_{(s)} + 4H2O2_{(aq)} -> PbSO4_{(s)} + 4H2O_{(l)}}\]

  1. Which substance is reduced?
  2. Which substance is oxidised?

Identify the component oxidised in the following reaction:

\[\ce{H2S + Cl2 -> S + 2HCl}\]


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


Give an example of an oxidation reaction.


Is oxidation an exothermic or an endothermic reaction?


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


The process of respiration is ______.


You are given the following chemical equation:

\[\ce{Mg_{(s)} + CuO_{(s)} -> MgO_{(s)} + Cu_{(s)}}\]

This equation represents:


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.

\[\ce{CuO_{(s)} + H2_{(g)} -> Cu_{(s)} + H2O_{(l)}}\]


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


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


Give scientific reason.

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


Identify from the reaction the reactants that undergo oxidation and reduction.
Fe + S → FeS


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

\[\ce{2Ag2O → 4 Ag + O2 \uparrow}\]


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

\[\ce{NiO + H2 -> Ni + H2O}\]


In what respect does hydrogen differ from:

alkali metals


Give the general group study of hydrogen with reference to

burning


Why this reaction is considered a reversible reaction?


State whether the following conversion is oxidation or reduction:

Cu2+ + 2 e-→ Cu 


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+


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: 

a substance that oxidizes concentrated HCl to chlorine.


Complete and balance the following equation:

CuO +__________→ Cu +___________


Complete and balance the following equation:

Fe + H2O →___________+____________


Distinguish between oxidation and reduction.

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.


Give two tests for a reducing agent.


Write chemical formula for rust.


Explain the following reaction with their balanced chemical equation.

Hydrogen sulphide reacts with sulphur dioxide.


The process of reduction involves ____________.


When Ag is exposed to air it gets a black coating of ____________.


Select the oxidising agent for the following reaction:

\[\ce{H2S + I2 -> 2HI + S}\]


Identify the reducing agent in the following reactions

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


Identify the reducing agent in the following reactions - 

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


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


Which among the following are physical or chemical change?

Sublimation of solid ammonium chloride


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.


The tarnishing of metals is an example of ______ reaction.


______ is a metal that has a high resistance to corrosion.


Choose the odd one out and write the reason:


Identify the following reactions as oxidation/reduction/redox reaction

CuO+H2 → Cu+H2O


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

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


A reddish brown metal used in electrical wires when powdered and heated strongly turns black. When hydrogen gas is passed over this black substance, it regains its original colour. Based on this information answer the following questions:

  1. Name the metal and the black substance formed.
  2. Write balanced chemical equations for the two reactions involved in the above information

State the change in colour observed in following case mentioning the reason:

Copper powder is strongly heated in air.


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