CBSE Class 10 Science Metals and non metals Sure Shot Questions B

CBSE Class 10 Science Metals and non metals Sure Shot Questions B. There are many more useful educational material which the students can download in pdf format and use them for studies. Study material like concept maps, important and sure shot question banks, quick to learn flash cards, flow charts, mind maps, teacher notes, important formulas, past examinations question bank, important concepts taught by teachers. Students can download these useful educational material free and use them to get better marks in examinations.  Also refer to other worksheets for the same chapter and other subjects too. Use them for better understanding of the subjects.

METALS AND NON-METALS

Question. What is the colour of aqueous solution of CuSO₄ and FeSO₄ as observed in the laboratory?
(a) CuSO₄ – blue; FeSO₄ – light green
(b) CuSO₄ – blue; FeSO₄ – dark green
(c) CuSO₄ – green; FeSO₄ – blue
(d) CuSO₄ – green; FeSO₄ – colourless
Answer: A

Question. A student took four test tubes I, II, III and IV containing aluminium sulphate, copper sulphate? ferrous sulphate and zinc sulphate solutions respectively. He placed an iron strip in each of them.
In which test tube, he found a brown deposit?

(a) I
(b) II
(c) III
(d) IV
Answer: B

Question. Aqueous solutions of zinc sulphate and iron sulphate were taken in test tubes I and II by four students A, B, C and D. Metal pieces of iron and zinc were dropped in the two solutions and observations made after several hours were recorded in the form of table as given below:
Which student has given the correct report?
(a) B
(b) D
(c) A
(d) C
Answer: D

Question. 2 mL each of cone. HCl, cone. HNO3 and a mixture of cone. HCl and cone. HNO₃ in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B ,but the metal got dissolved in test tube C.
(a) Al
(b) Au
(c) Cu
(d) Pt
Answer: B, D

Question. When an aluminium strip is kept
(a) Green solution of FeSO₄ slowly turns brown
(b) Green solution of FeSO₄ rapidly turns brown
(c) No change in colour of FeSO₄
(d) Green solution of FeSO₄ slowly turns colourless
Answer: A

Question. Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?
(i) Good thermal conductivity
(ii) Good electrical conductivity
(iii) Ductility
(iv) High melting point
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (i) and (iv)
Answer: D

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
(a) CuSO₄
(b) CuCO₃
(c) Cu(NO₃)₂
(d) CuO
Answer: B

Question. A non-metal X exists in two different forms Y and Z. Y is the hardest natural substance,
whereas Z is a good conductor of electricity. Identify X, Y and Z.
Answer: X = Carbon, Y = Diamond, Z = Graphite

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. Therefore, when zinc is added to a solution of iron (II) sulphate, then the greenish colour of iron (II) sulphate solution fades gradually due to the formation of colourless zinc sulphate solution and iron metal is deposited on zinc.

Question. Give an example of a metal which :
(i) is a liquid at room temperature.
(ii) can be easily cut with a knife.
(iii) is the best conductor of heat.
(iv) is a poor conductor of heat.
Answer:
(i) Mercury
(ii) Sodium
(iii) Silver
(iv) Lead

Question. Explain the meanings of malleable and ductile.
Answer: Malleable : A metal that can be beaten into thin sheets on hammering is called malleable.
Ductile : A metal which can be drawn into thin wires is called ductile

Question. Why is sodium kept immersed in kerosene oil ?
Answer: Sodium is highly reactive. So it is kept immersed in kerosene oil to prevent its reaction with
oxygen, moisture and carbon dioxide of air to prevent accidental fires.

Question. Write equations for the reactions of
(i) iron with steam.
(ii) calcium and potassium with water.
Answer:

1. Which of the following can be beaten into thin sheets?

(a) Zinc (b) Phosphorus (c) Sulphur (d) Oxygen

2. Which of the following statements is correct?

(a) All metals are ductile.

(b) All non-metals are ductile.

(c) Generally, metals are ductile.

(d) Some non-metals are ductile.

3. Which of the following is not a metal?

(a) copper

(b) sulphur

(c) aluminium

(d) iron

4. The substance that will be flattened on beating with a hammer is

(a) crystal of iodine

(b) lump of sulphur

(c) piece of coal

(d) zinc granule

5. Arun has learnt that non-metals on beating with a hammer are generally broken into pieces. Which of the following is a nonmetal?

(a) iron nail

(b) aluminium wire

(c) copper plate

(d) piece of coal

6. Materials which can be drawn into wires are called ductile. Which of the following is not a ductile material?

(a) silver

(b) copper

(c) sulphur

(d) aluminium

7. Metals are generally hard. Which of the following metals is an exception and can be cut with a knife?

(a) iron

(b) sodium

(c) gold

(d) magnesium

8. Metals are generally solid. Which of the following metals is in the liquid state at room temperature?

(a) mercury

(b) silver

(c) aluminium

(d) sodium

9. Metals generally react with dilute acids to produce hydrogen gas. Which one of the following metals does not react with dilute hydrochloric acid?

(a) magnesium

(b) aluminium

(c) iron

(d) copper

10. Which of the following reacts with cold water vigorously?

(a) carbon

(b) sodium

(c) magnesium

(d) sulphur

11. The metal which produces hydrogen gas on reaction with dilute hydrochloric acid as well as sodium hydroxide solution is

(a) copper

(b) iron

(c) aluminium

(d) sodium

12. Which of the following non-metals reacts and catches fire on exposure to air?

(a) phosphorus

(b) nitrogen

(c) sulphur

(d) hydrogen

13. Generally metallic oxides are basic and non-metallic oxides are acidic in nature. Solution of which of the following oxides in water will change the colour of blue litmus to red?

(a) sulphur dioxide

(b) magnesium oxide

(c) iron oxide

(d) copper oxide

14. Which of the following property is not responsible for copper to be used as electrical conduction wires?

(a) ductility

(b) colour

(c) good conductor of electricity

(d) it is solid

15. Fill in the blanks :
(a) Phosphorus is very __________ non-metal.
(b) Metals are __________ conductors of heat and __________.
(c) Iron is __________ reactive than copper.
(d) Metals react with acids to produce __________ gas.

16. A substance is malleable, ductile and electropositive in nature. What type of substance is it?

17. What property of a metal makes it possible to draw it into wires?

18. Why are metals good conductors?

19. Name the metal which is commonly used for making cooking utensils

20. Fill in the blanks:
(a) __________ is liquid metal
(b) __________ is only liquid Non metals
(c) __________, __________ and __________ are soft metal
(d) __________ is the hardest natural substance
(e) __________ and __________ are have low melting points. They melt in the palm of the hand
(f) Metals can be beaten into thin sheets so they are called __________
(g) Non metals are bad conductors of electricity except __________
(h) Metals react with oxygen to form __________ oxides
(i) Some metal oxides show acidic and basic properties. They are called __________. Eg :- Aluminum oxide, Zinc oxide etc.
(j) Al2O3 + 6HCl  →__________ + 3H2O
(k) Al2O3 + NaOH → __________ + H2O
(l) __________ and __________ does not react with oxygen even at high temperature.
(m) Metals like potassium and sodium react vigorously with oxygen and catch fire if kept in open. Hence they are stored in __________ to prevent burning
(n) Magnesium reacts only with __________ water to form magnesium hydroxide and hydrogen.
(o) Metals like aluminium, iron and zinc react only with __________ to form the metal oxides and hydrogen.
(p) __________ gas is not evolved when metals react with nitric acid (HNO3) because it is a strong oxidising agent
(q) A more reactive metal displaces a __________ reactive metal from its salt solution
(r) The arranging of metals in the decreasing order of their reactivity is called __________ series of metals.
(s) Metals lose electrons and become positive ions. So they are called __________ elements
(t) Non metals __________ electrons and become negative ions. So they are called electro negative elements
(u) __________ are compounds formed by the transfer of electrons from a metal to a non metal.
(v) If one of the metals in an alloy is mercury, it is called an __________
(w) __________ is the damage caused to metals due to the reaction of metals with oxygen, moisture, carbon dioxide etc.
(x) Some elements show properties of both metals and non metals. They are called __________
(y) __________ is a mixture of concentrated nitric acid and concentrated hydrochloric acid in the ratio 1:3.

21. Name one electrovalent compounds in each case in which ;

(i)One atom combines with one other atom

(ii)One atom combines with two other atoms

(iii)One atom combines with three other atoms

22. Give reasons for the following :

(a) Aluminium foils are used to wrap food items.

(b) Immersion rods for heating liquids are made up of metallic substances.

(c) Copper cannot displace zinc from its salt solution.

(d) Sodium and potassium are stored in kerosene.

23. Can you store lemon pickle in an aluminium utensil? Explain.

24. Write the electron dot structure for oxygen and magnesium.

25. Show the formation of Na2O and CaO by the transfer of electrons.

26. Write an activity to show that ionic compounds are good conductors of electric current in their aqueous solution.

27. Why is aluminum extracted from alumina by electrolytic reduction and not by reducing with carbon?

28. Why is ZnO called an amphoteric oxide? Give the support to your answer. Give equation for the following

(a) Iron is heated with steam.

(b) Magnesium reacts with water.

(c) iron reacts with dil.HCl

29. What would you observe when zinc is added to a solution of iron (II) sulphate? Write the chemical reaction that takes places.

30. A trivalent metal X is manufactured by the process of electrolysis, It is the most abundant metal in the earth’s crust. Identify the metal and state its two uses.

31. Which gas is always produced when a metal reacts with a dilute Write chemical reaction when iron reacts with dil. H2SO4.

32. What is the activity series of metals? Rearrange the following metals in an increasing order of reactivity: Aluminum, Zinc, Mercury.

33. What is meant by the term ‘enrichment of ore’ ? name four Methods generally used for enrichment of ores.

34. 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

35. Write a balanced chemical equation for the reaction of the following metals with water: (i) Ca (ii) Zn (iii) Fe

36. Define the terms:(i) Mineral (ii) Ore and (iii) Gangue

37. Explain how the following metals are obtained from their compounds by the reaction process:

(i) Metal ‘X’ , which is low in reactivity series.

(ii) Metal ‘Y’, which is middle in reactivity series.

(iii) Metal ‘Z’ which is high up in the reactivity series.

38. Give reasons:

(a) The surface of some metals acquires a dull appearance when exposed to air for a long time.

(b) A salt which does not conduct electricity in the solid state becomes a good conductor in molten state

39. What will happen if a :

(i) Strip of zinc is immersed in a solution of copper sulphate.

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