मराठी

During the reaction of some metals with dilute hydrochloric acid, following observations are made. The temperature of the reaction mixture rises when aluminium (Al)

Advertisements
Advertisements

प्रश्न

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.

एक शब्द/वाक्यांश उत्तर
Advertisements

उत्तर

The reaction of aluminium (Al) with dilute HCl is of exothermic nature. Therefore the temperature rises.

shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 1: Chemical Reactions and Equations - Exemplar [पृष्ठ ६]

APPEARS IN

एनसीईआरटी एक्झांप्लर Science Exemplar Class 10
पाठ 1 Chemical Reactions and Equations
Exemplar | Q 31. (b) | पृष्ठ ६

व्हिडिओ ट्यूटोरियलVIEW ALL [2]

संबंधित प्रश्‍न

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


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


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

The removal of hydrogen from a substance is called reduction.


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


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

Reduction


Give the general group study of hydrogen with reference to

burning


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

Mg + 2HCl → MgCl2 + H2


State whether the following conversion is oxidation or reduction:

Cu2+ + 2 e-→ Cu 


Which of the following statements about hydrogen is incorrect?


For the reaction PbO + H2→ Pb + H2O, which of the following statements is wrong?


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?


A silver article generally turns black when kept in the open for a few days. The article when rubbed with toothpaste again starts shining.

  1.  Why do silver articles turn black when kept in the open for a few days? Name the phenomenon involved.
  2. Name the black substance formed and give its chemical formula.

What is a redox reaction?


What are reducing agents? Give examples.


Define oxidation number.


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

Zn in ZnSO4


Identify the type of chemical reaction given below:

\[\ce{2Mg + O2 -> 2MgO}\]


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.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×