Important MCQs from CBSE Class 10 Science Chapter 3 – Metals and Non-Metals are provided here to prepare for the objective type questions for Board Exam 2021-2022.
MCQs from CBSE Class 10 Science Chapter 3: Metals and Non-Metals
The non-metal which is liquid at room temperature is:
Answer: (b) Bromine
Explanation: Bomine is the only non-metal which exists as a liquid at room temperature. It is a dense, reddish-brown liquid evaporating at standard temperature and pressure to give an orange vapour. It is one of the only two elements on the periodic table that are liquids at room temperature other than mercury(mercury is call liquid metal) . The other non-metals are solids at room temperature, including carbon and sulfur.
- The most abundant metal in the earth’s crust is
Aluminum is the most abundant metal in the Earth’s crust . Reading: Abundance of Elements in Earth’s Crust
The table shows the abundance of elements in Earth’s crust.
Rank Atomic Number Element Symbol 1 8 oxygen O 2 14 silicon Si 3 13 aluminium Al 4 26 iron Fe 5 20 calcium Ca 6 11 sodium Na 7 19 potassium K 8 12 magnesium Mg 9 22 titanium Ti 10 1 hydrogen H 11 15 phosphorus P 12 25 manganese Mn 13 9 fluorine F 14 56 barium Ba 15 6 carbon C 16 38 strontium Sr 17 16 sulfur S 18 40 zirconium Zr 19 74 tungsten W 20 23 vanadium V 21 17 chlorine Cl 22 24 chromium Cr 23 37 rubidium Rb 24 28 nickel Ni 25 30 zinc Zn 26 29 copper Cu 27 58 cerium Ce 28 60 neodymium Nd 29 57 lanthanum La 30 39 yttrium Y
- 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
(iv) High melting point
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (i) and (iv)
Solution: Good thermal conductivity, malleability, light weight and high melting point are the properties of aluminium due to which it is used for making cooking utensils.
The number of protons in an atom of an element A is 17 then, the number of electron in its ion A- is:
Answer: (a) 18
Explanation: In the neutral atom of an element
The sulphide ores are converted into oxides by heating strongly in the presence of excess air. This process is known as
Answer: (a) Roasting
Explanation: The process of heating the sulphide ore strongly in the presence of air to convert it into metal oxide, is known as roasting.[Cu, Zn, Ag…..]
An element X is soft and can be cut with the help of a knife. It is very reactive to air and cannot be kept open in the air. It reacts vigorously with water. Identify the element from the following:
Answer: (b) Na
Explanation: Na is a metal which is soft enough to be cut with a knife. It is so reactive that it reacts vigorously with air or moisture and catches fire when kept in open. So to prevent it from coming in contact with oxygen and moisture, it is kept in kerosene.
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
Answer: (a) Ca
Explanation: Ionic Oxides have high melting and boiling point Also disolved in water so, calcium reacts with oxygen to give calcium oxide (CaO) which is having a high melting point and dissolves in water to form calcium hydroxide (Ca(OH)2)along with the release of large amount of thermal energy.
Which of the following alloys contains a non-metal as one of its constituents?
Answer: (a) Steel
Explanation: Stainless steel is an alloy of iron (a metal) and carbon (a non metal).
Galvanisation is a method of protecting steel and iron from rusting by coating them with a thin layer of
Answer: (c) Zinc
Explanation: In this method a thin layer of zinc metal is deposited over the surface of steel or iron objects, which does not corrode on exposure to damp air and prevents the coated metals from rusting.
In electrolytic refining, the cathode is made up of
a) Pure metal
b) Impure metal
d) Metallic salt
Answer: (a) Pure metal
Explanation: In electrolytic refining of a metal, the cathode is made up of pure metal whereas the anode is made up of impure metal.
In the given reaction, Al2O3 + NaOH → ……X…… + H2O ; What is element X?
- a) NaAlO2
- b) Na3Al
- c) Na2O3
- d) NaAl2O3
Answer: (a) NaAlO2
Explanation: Aluminium oxide is amphoteric in nature, i.e., it reacts with acids as well as bases to form salt and water. Here, aluminium oxide behaves as an acid as it reacts with NaOH, a base and forms sodium aluminate (NaAlO2) and water:
Al2O3 + NaOH → 2NaAlO2+ H2O
Which of the following represent the correct order of decreasing reactivity?
a) Mg > Al > Zn > Fe
b) Mg > Zn > Al > Fe
c) Al > Zn > Fe > Mg
d) Mg > Fe > Zn > Al
Answer: (a) Mg > Al > Zn > Fe
Explanation: The decreasing order of the reactivity of the common metals is given below:
Li, K, Na, Ba, Ca, Mg , Al, Mn, Zn, Fe, Ni, Sn, Pb, [H], Cu,Hg, Ag, Au,Pt
Bauxite is an ore of
Answer: (b) Aluminium
Explanation: Bauxite is a commercial ore of aluminium which consists largely of hydrated aluminium oxide, Al2O3.2H2O. List of ores with chemical formula
Element Ores Chemical Composition Aluminum Bauxite Al2O3 . 2H2O Corundum Al2O3 Kryolite Na3AlF6 Dyspore Al2O3.H2O Copper Copper Pyrite CuFeS2 Malachite 2CuCO3Cu(OH)2 Iron Hematite Fe2O3 Magnetite Fe3O4 Siderite FeCO3 Sodium Sodium Carbonate Na2CO3 Sodium Chloride NaCl Sodium Nitrate NaNO3 Sodium Sulphate Na2SO4 Potassium Potassium Chloride KCl Potassium Carbonate K2CO3 Potassium Nitrate KNO3 Magnesium Magnesite MgCO3 Dolomite CaMg(CO3)2 Epsom Salt MgSO4 Calcium Calcium Carbonate CaCO3 Tin Cassiterite SnO2 Lead Galena PbS Cerussite PbCO3 Anglesite PbSO4 Silver Argentite Ag2S Tetrahedrite Sb4S3 Zinc Zinc Carbonate (known as calamine) ZnCO3 Zinc Sulphide ZnS Mercury Cinnabar HgS Manganese Pyrolusite MnO2 Phosphorous Phosphorite Ca3(PO4)2 Fluorapatite Ca5 (PO4)3F Chlorapatite 3Ca3(PO4)2.CaCI2 Gold Calaverite AuTe2 Sylvanite (Ag,Au)Te2 Nagyágite (Pb5Au(Te, Sb)4S5-8) Petzite Ag3AuTe2 Antimony Stibnite Sb2S3 Stibiconite (Sb3+ Sb25+ O6(OH)) Cobalt Cobaltite CoAsS Nickel Pentlandite ((Ni, Fe)S) Chromium Chromite (FeCr2O4)
Key Points Set 1
- Mercury is the only metal which exists as a liquid at room temperature.
- Sonorousness property of metals is used for making bells and strings of musical instruments like Sitar and Violin.
- Non-metals form covalent chlorides because they can share electrons with chlorine.
- Chemical reaction > prolonged reaction of iron with steam > 3Fe (s) + 4H2O (g) → Fe3O4 (s) + 4H2 (g)
- The highly reactive metals like Sodium, Potassium, Magnesium, etc. are extracted by the electrolysis of their molten chloride. Pure metal use as cathode and crude metal use as anode.
- Iodine is non metal but it is lustrous.
- In calcination process a carbonate ore is heated strongly in the absence of air to convert it into metal.
- Example of an amphoteric oxide is: ZnO, BeO, …..
- Example of an acidic oxide is:
- Example of an basic oxide is:
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