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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?

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उत्तर

Reduction is gain of electrons.

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

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

वीडियो ट्यूटोरियलVIEW ALL [2]

संबंधित प्रश्न

Corrosion can be prevented by using ……………. solution.


Define ‘redox reaction’. Give one example.


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


What is an oxidising agent?


A shiny brown-coloured element ‘X’ on heating in air becomes black in colour. Name the element ‘X’ and the black-colored compound formed.


Write the chemical formula of rust.


What is an oxidation reaction? Identify in the following reaction (i) the substance oxidised, and (ii) the substance reduced:

ZnO + C → Zn + CO


When SO2 gas is passed through saturated solution of H2S, the following reaction occurs:

SO2 + 2H2S → 2H2O + 3S

In this reaction, which substance is oxidised and which one is reduced?


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


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


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


When copper powder is heated strongly in air, it forms copper 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


You are given the following chemical equation:

Mg (s) + CuO (s) → MgO (s) + Cu (s)

This equation represents:
(a) decomposition reaction as well as displacement reaction
(b) combination reaction as well as double displacement reaction
(c) redox reaction as well as displacement reaction
(d) double displacement reaction as well as redox reaction


Define redox reaction.


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

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


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 following reaction the reactants that undergo oxidation and reduction.

\[\ce{2Ag2O → 4 Ag + O2 \uparrow}\]


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

Reduction


Describe briefly the ionic concept of oxidation and reduction. Give an equation to illustrate.


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


Name:

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


Name: 

a solid that is an oxidizing agent. 


Complete and balance the following equation:

Zn +_________________→ZnCl2 + H2 


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.


Give two test for an oxidising agent.


When the positive charge on an ion increases or the negative charge on them decreases it is called as _______.


Write chemical formula for rust.


Explain the following reaction with their balanced chemical equation.

Hydrogen sulphide reacts with sulphur dioxide.


Find the oxidation number of the elements in the following compounds. 

  1. C in CO2
  2. Mn in MnSO4
  3. N in HNO3

The process of reduction involves ____________.


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

Identify the substance oxidized in the above equation.


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


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

`3"Fe" + 4"H"_2"O" -> "Fe"_3"O"_4 + 4"H"_2`


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


On adding a drop of barium chloride solution to an aqueous solution of sodium sulphite, white precipitate is obtained :

  1. Write a balanced chemical equation for the reaction involved.
  2. What other name can be given to this precipitation reaction?
  3. On adding dilute hydrochloric acid to the reaction mixture, white precipitate disappears. Why?

Write a short note on oxidizing and reducing agents.


What is a redox reaction?


The tarnishing of metals is due to the formation of ______.


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.


What is rancidity?


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

Zn in ZnSO4


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

Metals are good ______.


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


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