List of top Science Questions on Metals and Non-Metals asked in CBSE Class X, CBSE Compartment X

Show the formation of ionic compound CaO with electron dot structure.
Give reasons for the following: The wires carrying current in homes have a coating of PVC.
Carbon cannot reduce the oxides of Na or Mg.
Carbon cannot reduce the oxides of Na or Mg.
Solder, an alloy of lead and tin, is used for welding electrical wires.
Which of the following will not undergo addition reaction?
Which of the following is an amphoteric oxide?
Which of the following set of compounds does not belong to same homologous series?
What is excretion? Why is it necessary for any living organism?
When an element 'X' reacts with water, it starts floating. Identify the element 'X':
Name and describe the most widely used method for refining impure metals?
"Aluminium oxide is an amphoteric oxide." Justify this statement giving chemical equation for the reactions involved.
Many pure metals like copper, iron and gold are very soft and as such are considered unsuitable for certain uses. Metallic objects around us such as cooking utensils, statues, ornaments, guns etc. are actually not made up of pure metals. Instead of pure metals, alloys are used in the design of most of the useful objects. Making alloys enhances the basic properties of a metal which is the primary constituent (metal) of an alloy.
What is stainless steel? How is it prepared? Write one important property which makes it more useful in making cooking utensils as compared to its primary metal.
Many pure metals like copper, iron and gold are very soft and as such are considered unsuitable for certain uses. Metallic objects around us such as cooking utensils, statues, ornaments, guns etc. are actually not made up of pure metals. Instead of pure metals, alloys are used in the design of most of the useful objects. Making alloys enhances the basic properties of a metal which is the primary constituent (metal) of an alloy.
What are alloys? How is 'Brass' (an alloy) prepared?
Many pure metals like copper, iron and gold are very soft and as such are considered unsuitable for certain uses. Metallic objects around us such as cooking utensils, statues, ornaments, guns etc. are actually not made up of pure metals. Instead of pure metals, alloys are used in the design of most of the useful objects. Making alloys enhances the basic properties of a metal which is the primary constituent (metal) of an alloy.
Name an alloy used for welding two wires together in an electric circuit. Write its major constituents.
Many pure metals like copper, iron and gold are very soft and as such are considered unsuitable for certain uses. Metallic objects around us such as cooking utensils, statues, ornaments, guns etc. are actually not made up of pure metals. Instead of pure metals, alloys are used in the design of most of the useful objects. Making alloys enhances the basic properties of a metal which is the primary constituent (metal) of an alloy.
How does electrical conductivity and melting point of a metal change when it is converted to its alloy by mixing a small amount of an element in it?
Assertion (A): In the common domestic circuits, the earth wire is connected to a metallic plate buried deep inside the earth.
Reason (R): Earth wire ensures that any leakage of current to the metallic body of the appliance keeps its potential to that of the earth, so the user may not get a severe electric shock.
Which one of the following metals is protected from corrosion by a layer of its own oxide?
Draw a labelled diagram to show electrolytic refining of copper. State what happens when electric current is passed through the electrolyte taken in this case.
Consider the following cases:
(a) CaSO4 + Al →
(b) CuSO4 + Ca →
(c) FeSO4 + Cu →
(d) ZnSO4 + Mg →
The cases in which new products will form are –
With the help of chemical equations, differentiate between roasting and calcination. How is metal reduced from the product obtained after roasting/calcination of the ore? Write the chemical equation for the reaction involved.
Name and explain the most widely used method for refining impure metals.
When a strip of aluminium metal is dipped in a solution of ferrous sulphate, the pale green colour of the solution fades away. State the conclusion you can draw from this observation. Write the chemical equation for the reaction that occurs in this case.
two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.
Assertion (A): Silver oxide (\(\text{Ag}_2\text{O}\)) is an amphoteric oxide.
Reason (R): Metal oxides which react with both acids as well as bases are called amphoteric oxides.
The most reactive metal among the following towards cold water is: