CBSE Class 10 Science Metals and Non Metals Assignment Set B

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Assignment for Class 10 Science Chapter 3 Metals And Non-Metals

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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) ?
(a) CaCO3
(b) CaO
(c) Ca(OH)2
(d) Ca(HCO3)2
Answer : C

Question : Bleaching powder has strong bleaching action due to -
(a) chlorine
(b) nascent chlorine
(c) nascent oxygen
(d) Cl
Answer : B

Question : Dolomite is mineral whose formula is -
(a) CaCO3
(b) MgCO3
(c) CaCO3.MgCO3
(d) CaSO4.2H2O
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 -
(a) Ca(HCO3)2
(b) CaCO3
(c) Na2CO3
(d) K2CO3
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 ?
(a) limonite
(b) cassiterite
(c) magnetite
(d) none of these
Answer : B

Question : In the extraction of copper from sulphide ore the metal is formed by reduction of Cu2O with :
(a) FeS
(b) CO
(c) Cu2S
(d) SO2
Answer : C

Question : Which of the following is a carbonate ore ?
(a) pyrolusite
(b) malachite
(c) diaspore
(d) cassiterite
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  

Question :  Metal always found in free state is? 
(a) Sodium
(b) Lithium
(c) Copper
(d) Gold
Answer :  D 
Explanation: Gold, platinum, copper, silver are few metals which can be found in free state, because they are unreactive in normal conditions with air, water and other chemicals.
 
Question :  Ayush is putting in the test tube containing water whereas Piyush is putting water in the lest tube containing . Which of the two is likely to face danger?
(a) Piyush
(b) Ayush
(c) None of the two
(d) Both Ayush and Piyush
Answer :  A
Explanation: Piyush is likely to face danger. Addition of water to concentrated sulphuric acid is an exothermic reaction and can lead to explosions. Water should not be poured into a container containing an acid. 
 
Question : Which of the following methods is suitable for preventing an iron frying pan from rusting?
(a) Applying grease
(b) Applying paint
(c) Applying a coating of zinc 
(d) All of the above
Answer :  C 
 
Question : Cryolite is used in the electrolytic reduction of Alumina (Al2O3)to: 
(a) Decrease the melting point of Al2O3
(b) All of these
(c) Act as a flux to separate gangue.
(d) To slow down the reaction.
Answer :  A 
Explanation: The difficulty of separating aluminium from oxygen in the alumina is overcome by the use of cryolite as a flux to dissolve the oxide mineral. Pure cryolite melts at 1012 °C. It dissolves the aluminium oxides sufficiently well to allow easy extraction of the aluminium by electrolysis.
 
Question : An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be
(a) Calcium 
(b) Carbon
(c) Silicon
(d) Iron
Answer :  A 
 
Question :  Food cans are coated with tin and not with zinc because
(a) Zinc is costlier than tin.
(b) Zinc has a higher melting point than tin.
(c) Zinc is more reactive than tin. 
(d) Zinc is less reactive than tin.
Answer :  C 
 
Question : Malachite is an ore of: 
(a) Mercury
(b) Zinc
(c) Iron
(d) Copper
Answer :  D
Explanation: Malachite is a copper carbonate hydroxide mineral with the formula CuCO3.Cu(OH)2
 

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 _____________ .
Answer: rusting

Question. A non-metal which is a good conductor of electricity is ……… .
Answer: Graphite

Question. ……… is an allotroph of carbon and is the hardest natural substance.
Answer: Diamond

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 ……… .
Answer: Magnesium

Question. Metals above hydrogen in the activity series can displace ……… from dilute acids.
Answer: Hydrogen

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 _____________ .
Answer: CuCO3

Question. _____________ is a non-metal which has a very high melting and boiling point.
Answer: Diamond

Question. Metal oxides ……… and ……… dissolve in water to form alkalis.
Answer: Sodium Oxide and Potassium oxide

Question. A non-metal which is lustrous is ……… .
Answer: Iodine

Question. The formula of calcium nitride is _____________ .
Answer: Ca3N2

 Short and Long Questions :
 
Question :   You are given a hammer, a battery, a bulb, wires and a switch.
a) How could you use them to distinguish between samples of metals and non- metals?
b) Assess the usefulness of these tests in distinguishing between metals and non- metals.
Answer : a) With the hammer, we can beat the sample and if it can be beaten into thin sheets (that is, it is malleable), then it is a metal otherwise a non-metal. Similarly, we can use the battery, bulb, wires, and a switch to set up a circuit with the sample. If the sample conducts electricity, then it is a metal otherwise a non-metal.
b) These experiments can be helpful to demonstrate the malleability and electric conductivity of the metals and non-metals.
 
Question :  What are amphoteric oxides? Give two examples of amphoteric oxides
Answer : Oxides that react with both acids and bases to form salt and water are known as amphoteric oxides.
Amphoteric oxides show properties of both acids and bases. Examples: PbO and Al2O3 . 
 
Question :   Name two metals which will displace hydrogen from dilute acids, and two metals which will not.
Answer : Zinc (Zn) and Magnesium (Mg) are the two metals which will displace Hydrogen from dilute acids as they are very reactive metals. Gold (Au) and Silver (Ag) are the metals which will not replace Hydrogen from dilute acids as these metals are less reactive. 
 
Question :   In the electrolytic refining of a metal M, what would you take as the anode, the cathode and the electrolyte?
Answer : In the process of electrolytic refining of metal called ‘M’, An impure and thick block of metal M is considered as anode, Thin strip or wire of pure metal M is taken as cathode. A suitable salt solution of metal M is considered as the electrolyte.
 
Question :  Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it, as shown in figure below.

8th.sci.eng.oct.nov.21.22 13

a) What will be the action of gas on:
(i) dry litmus paper?
(ii) moist litmus paper?
b) Write a balanced chemical equation for the reaction taking place.
Answer :  a) When sulphur powder is burnt in the air sulphur dioxide is formed)
(i) Sulphur dioxide does not have any effect on dry litmus paper.
(ii) Sulphur dioxide turn the moist litmus paper from blue to red because contact of SO2 with water turns to sulfurous acid 
b) S(s) + O2 (g) → SO2 (g)
SO2 (g) + H2O → H2SO3 
 
Question :   State two ways to prevent the rusting of iron.
Answer :   Iron can be prevented from rusting by:
(1) Painting.
(2) Greasing.
(3) Galvanization (Coating with zinc).
(4) By connecting with another active metal.
 
Question : What types of oxides are formed when non-metals combine with oxygen?
Answer :   When non-metals combine with oxygen it forms either acidic or neutral oxides. Ex: SO2 is an acidic oxide; CO is a neutral oxide. 
 
Question :  Give reasons:
a) Platinum, gold and silver are used to make jewellery.
Answer : Platinum, gold and silver are used to make jewellery as these metals are very less reactive hence they are not affected by air, water or most chemicals. These metals have a lot of lustre and they are malleable and ductile in nature.
 
b) Sodium, potassium and lithium are stored under oil.
Answer : Sodium and potassium are very reactive metals, if kept open these will react with oxygen and water to catch fire. Hence Sodium and potassium are kept immersed in kerosene to prevent their reaction with oxygen and moisture.
 
c) Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.
Answer : This is because aluminium reacts with oxygen present in air to form a thin layer of aluminium oxide.
This oxide layer is very stable and prevents further reaction of aluminium with oxygen. Also, it is light in weight and a good conductor of heat. Hence, it is used to make cooking utensils.
 
d) Carbonate and sulphide ores are usually converted into oxides during the process of extraction
Answer : Because metals can be easily extracted from their oxides rather than from their carbonates and sulphides. 
 
Question :  You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice.
Explain why these sour substances are effective in cleaning the vessels.
Answer :   Tarnished copper vessels being cleaned with lemon or tamarind because these sour substances contains acids which dissolve the layer of copper oxides and basic copper carbonate present on the surface of tarnished copper vessels. This makes them shining red-brown again. Hence they are very effective in cleaning tarnished copper vessels. 

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

Metals and Non metals_5

 

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 : A non-metal X exists in two different forms Y and Z. Y is hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y arid Z. 
Answer : The non-metal X is carbon (C). Y and Z are the allotropes of carbon (different physical forms of carbon). Y is diamond because diamond is the hardest natural substance known and Z is graphite which is a good conductor of electricity.
 
Question : Name two metals which will displace hydrogen from dilute acids, and two metals which will not? 
Answer : Sodium and calcium, being more reactive than hydrogen can displace hydrogen from dilute acids.
Copper and silver, being less reactive than hydrogen cannot displace hydrogen from dilute acids.
 
Question : State the property utilised in the following: 
i. Graphite in making electrodes.
ii. Electrical wires are coated with Polyvinyl Chloride (PVC) or a rubber-like material.
iii. Metal alloys are used for making bells and strings of musical instruments.
Answer : i. Graphite in an allotrope of carbon which is a good conductor of electricity because of presence of free electron and it is cheap, insoluble in water, do not react with acids and bases (non-corrosive). Due to these properties, it is used in making electrodes.
ii. Polyvinyl Chloride (PVC) or a rubber-like material are insulators means they are bad conductors of electricity and hence do not allow electrons to flow. Hence, these are used in coating the electrical wires.
iii. Metal alloys are used for making bells and strings of musical instruments because they are sonorous. 

 

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

a-35

The more reactive element can displace the less reactive element from its solution.
take two test tubes in test tube -1 take silver Sulphate solution(white in color) & in test tube-2 take copper Sulphate solution (blue in color). Add copper turnings to test tube -1 and add silver piece to test tube -2 keep the test tubes undisturbed for 15 minutes.
After sometime observe the color changes in both test tubes. The color in test tube – 1 changed from white to blue and there is no color change in test tube-2.this indicates in test tube-1 copper displaces silver from its silver Sulphate solution forms copper Sulphate. And in test tube- 2 no displacement reaction takes place. Hence from this experiment we are proving that copper is more reactive than silver. 
 
Question : i. Distinguish between ionic and covalent compounds under the following properties:
a. Strength of forces between constituent elements
b. Solubility of compounds in water
c. Electrical conduction in substances
ii. Explain how the following metals are obtained from their compounds by the reduction process:
a. Metal M which is in the middle of the reactivity series.
b. Metal N which is high up in the reactivity series. Give one example of each type.
Answer : i. a. Ionic compounds have strong force of attraction between the oppositely charged ions (e.g. Naand Cl-), so they are solids. Covalent compounds have weak force of attraction between their molecules, so they are usually liquids or gases.
b. Ionic compounds are soluble in water but covalent compounds are insoluble in water.
c. Ionic compounds conduct electricity when dissolved in water or when melted because they contain ions (charged particles). But, covalent compounds like glucose do not conduct electricity because they do not contain ions.
ii. a. The metal M which is in the middle of the reactivity series (such as iron, zinc, lead, copper, etc.) is moderately reactive. So, for obtaining such metals from their compounds, their sulphides and carbonates (in which they are present in nature) are first converted into their oxides by the process of roasting and calcination respectively. For example, 
a-36
 
The metal oxide (MO) are then reduced to the corresponding metals by using suitable reducing agents such as carbon. For example, zinc metal from its oxide is obtained as follow:
a-37
 
b. The metal N which is high up in the reactivity series (such as sodium, magnesium, calcium, aluminium, etc.), is very reactive and cannot be obtained from its compound by heating with carbon.
Therefore, such metals are obtained by electrolytic reduction of their molten salt. For example, sodium is obtained by the electrolysis of molten sodium chloride (NaCl).
a-38
 
Chapter 01 Chemical Reactions and Equations
CBSE Class 10 Science Chemical Reactions and Equations Assignment

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