METALS AND NON- METALS

 

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ATS COACHING CLASSES            SCIENCE (X)            METALS AND NON- METALS

 

MULTIPLE CHOICE QUESTIONS (MCQs)

 

1	An element 'M' has 50% of the electrons filled in the 3rd shell as in the 2nd shell. The atomic number of 'M' is (a) 10 (c) 14 (b) 12 (d) 18	1
2	During purification of a metal by electrolysis, what happens at the negative electrode? (a) Metal ions lose electrons to become neutral atoms. (b) Neutral metal atoms gain electrons to become ions. (c) Neutral metal atoms lose electrons to become ions. (d) Metal ions gain electrons to become neutral metal atoms.	1
3	On adding dilute sulphuric acid to a test tube containing a metal 'X', a colourless gas is produced when a burning match stick is brought near it. Which of the following correctly represents metal 'X'? (a) Sodium (b) Sulphur (c) Copper (d) Silver	1
4	An element with atomic number____ will form a  basic oxide. (a) 7 (2,5) (b) 17 (2,8,7) (c) 14 (2,8,4) (d) 11 (2,8,1)	1
5	The metals which are found in both free state as well as combined state are (a) gold and platinum (b) platinum and silver (c) copper and silver (d) gold and silver.	1
6	Out of the given metals, the metal Q is (a) iron (c) potassium (b) zinc (d) magnesium	1
7	A metal ‘X’ is used in thermite reaction. When X is burnt in air it gives an amphoteric oxide ‘Y’.’X’ and ‘Y’ are respectively (a) Fe and Fe2O3 (b) Al and Al2O3 (c) Fe and Fe3O4 (d) Al and Al3O4	1
8	On placing a copper coin in a test tube containing green ferrous sulphate solution, it will be observed that the ferrous sulphate solution (a) turns blue, and a grey substance is deposited on the copper coin. (b) turns colourless and a grey substance is deposited on the copper coin. (c) turns colourless and a reddish-brown substance is deposited on the copper coin. (d) remains green with no change in the copper coin.	1
9	Metals are lustrous and shiny especially when they freshly cut surfaces are exposed. Salma cut pieces and compared the lustre of the freshly cut surfaces of the following metals: Aluminium, Sodium, Copper, Iron. The freshly cut surface of which of these metals is likely to lose its lustre first on exposure to air? (a) Aluminium (b) Sodium (c) Copper (d) Iron	1
10	Identify the incorrect statements. (i) In their pure state, metals have a shining surface. (ii) Metals are generally soft. (iii) Some metals can be beaten into thin sheets. (iv) The ability of metals to be drawn into thin wires is called malleability. (a) (i) and (iii) only (b) (i) and (iv) only (c) (ii) and (iv) only (d) (ii) and (iii) only	1

 

ASSERTION AND REASON QUESTIONS (a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). (b) Both Assertion (A) and Reason (R) are true and Reason (R) is not the correct explanation of the Assertion (A). (c) Assertion (A) is true, and Reason (R) is false. (d) Assertion (A) is false, and Reason (R) True.

 

11	Assertion (A): Hydrogen gas is not evolved when zinc reacts with nitric acid. Reason (R): Nitric acid oxidises the hydrogen gas produced to water and itself gets reduced.	1
12	Assertion (A): Zinc oxide can be reduced to zinc metal on heating with carbon. Reason (R): Carbon is less reactive than zinc.	1
13	Assertion: Zinc is used in the galvanization of iron. Reason: Its coating on iron articles increases their life by protecting iron from rusting.	1
14	Assertion: Elements Cu, Ag, Au, Pt, noble gases, etc. occur in native state in nature. Reason: Elements which are not attacked by moisture, oxygen and CO2 of air occur in native state.	1

 

VERY SHORT ANSWER QUESTIONS

 

15	What would a student report nearly after 30 minutes of placing duly cleaned strips of aluminium, copper, iron and zinc in freshly prepared iron sulphate solution taken in four beakers?	2
16	Why is potassium kept immersed in kerosene?	2
17	Silver articles become black when kept in open for some time, whereas copper vessels lose their shiny brown surfaces and gain a green coat when kept in open. Name the substances present in air with which these metals react and write the name of the products formed.	2
18	What are strategic metals? Give one example also.	2
19	What are the main differences between calcination and roasting?	2

 

SHORT ANSWER TYPE QUESTIONS

 

20	What is aqua regia? Why are gold and platinum soluble in it?	3
21	How does the term ore differ from mineral? Give an example.	3
22	Describe an activity to find out the conditions under which iron rusts.	3
23	List three differentiating features between the processes of galvanisation and alloying.	3
24	A reddish-brown metal 'X', when heated in air, gives a black compound 'Y', which when heated in presence of H₂ gas gives 'X' back. 'X' is refined by the process of electrolysis; this refined form of 'X' is used in electrical wiring. Identify 'X' and 'Y. Draw a well-labelled diagram to represent the process of refining 'X’.	3
25	Why some metal surfaces acquire a dull appearance when they are exposed to moist air? Write colour acquired by the surfaces of copper and silver in such situation and also write the chemical names of the substances.	3
26	An element 'M' with electronic configuration 2, 8, 3 combines separately with CI, SO4 anions. Write the chemical formulae of the compounds formed. Predict with the suitable reason the nature of the bond formed by element 'M' in general. How will the electrical conductivity of the compounds formed vary with respect to 'M'?	3

 

LONG ANSWER TYPE QUESTIONS

 

27	Why is galvanisation considered better than tinning? Name and briefly explain two other methods that can be used for prevention of rusting.	5
28	i) By the transfer of electrons, illustrate the formation of bond in magnesium chloride and identify the ions present in this compound. (ii) Ionic compounds are solids. Give reason. (iii) With the help of a labelled diagram show the experimental set up of action of steam on a metal.	5
29	(a) How is the method of extraction of metals high up in the reactivity series different from that for metals in the middle ? Why cannot the same process be applied for them? Name and explain the process of extraction of sodium. (b) Draw a labelled diagram of electrolytic refining of copper.	5
30	Two ores X and Y were taken. On heating these ores it was observed that (a) ore X gives CO2 gas, and (b) ore Y gives SO2 gas. Write steps to convert these ores into metals, giving chemical equations of the reactions that take place.	5
31	Carbon cannot reduce the oxides of sodium, magnesium and aluminium to their respective metals. Why? Where are these metals placed in the reactivity series? How are these metals obtained from their ores? Take an example to explain the process of extraction along with chemical equations.	5
32	a) Explain the corrosion of iron. (b) Why is it that aluminium which is more reactive than iron does not corrode like iron? (c) How is corrosion of iron prevented by coating it with a layer of oil?	5
33	Give reason for the following: (a) lonic compounds have higher melting point and higher boiling point. (b) Sodium is kept immersed in kerosene. (c) Reaction of calcium with water is less violent. (d) Silver articles become black after some time when exposed to air. (e) Prior to reduction the metal sulphides and carbonates must be converted into metal oxides for extracting metals.	5

 

CASE BASED STUDY QUESTIONS

 

34	READ THE PASSAGE CAREFULLY AND ANSWER THE FOLLOWING QUESTION: Metals like copper and aluminium are used in electrical wires, while non-metals like sulphur and phosphorus are used in medicines and safety matches. Gold and platinum are used in jewellery because they do not corrode easily.   1. Why are metals good conductors of electricity? 2. Why is aluminium used in electrical transmission lines despite being less conductive than copper? 3. Name one non-metal used in fertilizers and one used in antiseptics. 4. Why is gold preferred for jewellery making? 5. Write two differences between metals and non-metals based on physical properties.	4
35	READ THE PASSAGE CAREFULLY AND ANSWER THE FOLLOWING QUESTION: Ravi performed an experiment by adding small pieces of metals (Zn, Fe, Cu, Al) to solutions of different metal salts (CuSO₄, FeSO₄, ZnSO₄). He observed color changes in some test tubes but not in others.   1. What type of reaction occurs when a more reactive metal displaces a less reactive metal from its salt solution? 2. Write the reaction when zinc is added to copper sulphate solution. 3. What will happen if copper is added to zinc sulphate solution? 4. Arrange Zn, Fe, and Cu in the decreasing order of their reactivity. 5. Which law of chemical reactions helps us understand these changes?	4
36	READ THE PASSAGE CAREFULLY AND ANSWER THE FOLLOWING QUESTION: A company extracts copper metal from its ore. First, the ore is concentrated, then roasted, and finally reduced to obtain pure metal. The molten metal is purified using electrolysis.   1. Name the ore from which copper is commonly extracted. 2. What is the purpose of roasting in metallurgy? 3. Write the chemical equation for the reduction of copper oxide. 4. What are the anode and cathode materials in the electrolytic refining of copper? 5. Why is electrolysis used for purification of metals like copper and zinc?	4
37	READ THE PASSAGE CAREFULLY AND ANSWER THE FOLLOWING QUESTION: A newly constructed iron bridge near a coastal area started showing reddish-brown flakes on its surface after a few months. Engineers identified it as rusting. They decided to paint and galvanize the bridge to prevent further damage.   1. What is rust chemically? Write its formula. 2. Why does rusting occur faster in coastal areas? 3. How does galvanization prevent rusting? 4. Name two other methods to prevent corrosion of metals. 5. Which property of iron makes it unsuitable for use without protection in humid environments?	4

 

 

 DOWNLAOD THE ASSIGNMENT HERE: 

FOLLOW THE INSTRUCTIONS FOR DOWNLOAD THIS ASSIGNMENT:

1. SEARCH WWW.SCIENCEARENA.IN

2. OPEN EDUCATION AND RESOURCES IN MENU BAR.

3. SINGLE CLICK DOWNLOAD AVAILABLE IN DOWNLAOD SECTION.

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