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Assignment for Class 10 Science Chapter 3 Metals And Non-Metals
Class 10 Science students should refer to the following printable assignment in Pdf for Chapter 3 Metals And Non-Metals in Class 10. This test paper with questions and answers for Class 10 Science will be very useful for exams and help you to score good marks
Chapter 3 Metals And Non-Metals Class 10 Science Assignment
MCQ Questions for NCERT Class 10 Science Metals and Non Metals
Question : In which of the following pair, both the substances are chemically same ?
(a) milk of lime and lime water
(b) dead burnt plaster and gypsum
(c) alumina and gypsum
(d) gypsum and plaster of paris
Answer : A
Question : Match the following -
Column ( A) Column (b)
(a) NaHCO3 (i) Caustic soda
(b) Na2CO3.10H2O (ii) Baking soda
(c) NaOH (iii) Blue vitriol
(d) CuSO4.5H2O (iv) Washing soda
(a) (a) (i), (b) (ii), (c) (iii), (d) (iv)
(b) (a) (ii), (b) (iv), (c) (i), (d) (iii)
(c) (a) (i), (b) (iv), (c) (ii), (d) (iii)
(d) (a) (ii), (b) (iv), (c) (iii), (d) (ii)
Answer : B
Question : Chemical (a) is used for water softening to remove temporary hardness. (a) reacts with Na2CO3 to generate caustic soda. When CO2 is bubbled through (a), it turns cloudy. What is the chemical formula of (a) ?
Answer : C
Question : Bleaching powder has strong bleaching action due to -
(b) nascent chlorine
(c) nascent oxygen
Answer : B
Question : Dolomite is mineral whose formula is -
Answer : C
Question : A solid compound ‘X’ on heating gives CO2 gas and a residue. The residue mixed with water forms ‘Y’. On passing an excess of CO2 through ‘Y’ in water, a clear solution ‘Z’ is obtained . On boiling ‘Z’. compound ‘X’ is reformed. The compound ‘X’ is -
Answer : B
Question : Which is not the correct process-mineral matching in metallurgical extraction.
(a) Leaching : silver
(b) Zone refining : lead.
(c) Liquation : tin
(d) Van Arkel : Zr
Answer : B
Question : Which of the following is not an ore of iron ?
(d) none of these
Answer : B
Question : In the extraction of copper from sulphide ore the metal is formed by reduction of Cu2O with :
Answer : C
Question : Which of the following is a carbonate ore ?
Answer : B
Question : Which of the following pairs will give displacement reactions?
(a) NaCl solution and copper metal
(b) MgCl2 solution and aluminium metal
(c) FeSO4 solution and silver metal
(d) AgNO3 solution and copper metal
Answer : D
Answer : D
Fill in the blanks :
Question. Metals can form positive ions by ……… .
Answer: losing electrons
Question. Metal reacts with water to give _____________ and hydrogen gas.
Answer: metal hydroxide
Question. The corrosion of iron is called _____________ .
Question. A non-metal which is a good conductor of electricity is ……… .
Question. ……… is an allotroph of carbon and is the hardest natural substance.
Question. Metals which are so soft that they can be cut with a knife are ………, ………
Answer: Sodium, Potassium
Question. A metal which burns in air with a dazzling white flame is ……… .
Question. Metals above hydrogen in the activity series can displace ……… from dilute acids.
Question. If copper is kept open in air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of _____________ .
Question. _____________ is a non-metal which has a very high melting and boiling point.
Question. Metal oxides ……… and ……… dissolve in water to form alkalis.
Answer: Sodium Oxide and Potassium oxide
Question. A non-metal which is lustrous is ……… .
Question. The formula of calcium nitride is _____________ .
Question : Why do ionic compound have high melting points?
Answer : Ionic compounds do not exist as single molecules but exist as aggregates of a large number of positive And negative ions due to strong electrostatic forces. Thus, large amount of energy is required to break The inter-ionic attraction, hence these have high melting points.
Question : Using the electronic configuration, explain how magnesium atom combines with oxygen atom to form Magnesium oxide by transfer of electrons.
Answer : Atomic no. of magnesium = 12
Question : What would you observe when zinc is added to a solution of iron (II) sulphate? Write the chemical Reaction that takes place.
Answer : Zinc is more reactive than iron. When zinc is added to a solution of iron (II) suphate, green color Of iron (II) sulphate fades out and iron metal is deposited)
Zn(s) + FeSO4(aq) —–→ Fe(s) + ZnSO4(aq)
Question : What is meant by reactivity series of metals? State which of the following chemical reaction will takes Place giving suitable reason for each.
a) Zn + CuSO4 ——→ ZnSO4 + Cu
b) Fe + ZnSO4 ——→ FeSO4 + Zn
c) Zn + FeSO3 ——→ ZnSO4 + Fe
Answer : Reactivity series is a series of metals arranged in the order of their decreasing order of reactivity.
a) Reaction will take place because Zn is above Cu in the reactivity series and more reactive then Cu.
b) Reaction will not take place as Fe is below Zn in the reactivity series cannot displace Zn from its Solution.
Question : Name the metal which is generally stored under kerosene and easily cut with knife.
Answer : Sodium
Question : Why does calcium float in water?
Answer : It is because hydrogen gas formed which sticks to surface of calcium, therefore it floats.
Question : Name the metal which reacts with a very dilute HNO3 to evolve hydrogen gas.
Answer : Magnesium.
Question : A non-metal A is the largest constituent of air, when heated with H2 in 1:3 ratio in the presence of catalyst (Fe) gives a gas B. On heating with O2 it gives an oxide C. If this oxide is passed into water in the presence Of air it gives an acid D which acts as a strong oxidizing agent.
a) Identify A, B, C and D
b) To which group of periodic table does this non-metal belongs?
Answer : a) A = N2 Nitrogen
B = NH3Amonia
C = NO Nitrogen
D = HNO3 Nitric oxide
b) element A belongs to group 15 of the periodic table. Metal
Question : How will you show that silver is less reactive than copper?
Answer : In activity series silver is placed below the copper. hence copper is more reactive than silver
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CBSE Class 10 Science Chapter 3 Metals And Non-Metals Assignment
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Assignment for Science CBSE Class 10 Chapter 3 Metals And Non-Metals
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Chapter 3 Metals And Non-Metals Assignment Science CBSE Class 10
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Chapter 3 Metals And Non-Metals Assignment CBSE Class 10 Science
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CBSE Science Class 10 Chapter 3 Metals And Non-Metals Assignment
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