CBSE Class 10 Chemistry HOTs Metals and Non Metals

Download HOTS questions and answers for Class 10 Chemistry. Read CBSE Class 10 Chemistry HOTs Metals and Non Metals below and download in pdf. High Order Thinking Skills questions come in exams for Chemistry in Standard 10 and if prepared properly can help you to score more marks. You can refer to more chapter wise Class 10 Chemistry HOTS Questions with solutions and also get latest topic wise important study material as per NCERT book for Class 10 Chemistry and all other subjects for free on Studiestoday designed as per latest CBSE, NCERT and KVS syllabus and pattern for Grade 10

CHAPTER No. 3

METALS AND NON METALS HOTS: (High Order Thinking Skill)

Questions with Answers:

Que1: Carbon can reduce copper oxide to copper but not calcium oxide to calcium. Why?

Ans: Carbon is a strong reducing agent so it can reduce copper oxide but calcium is much more reactive than copper and has greater affinity for oxygen than carbon has. So it cannot reduce calcium oxide to calcium.

Que2. A yellow coloured powder `X` is soluble in carbon disulfide. It burns with a blue flame forming suffocating smelling gas which turns moist blue litmus red. Identify `X` and gives chemical reaction. Identify it is metal or nonmetal. 

Ans 2:`X` is sulphur S + O2 -> SO2 It is non metal.

Que3. Nikita took Zn, Al, Cu, Fe, Mg, Na metals & put each metal in cold water and then hot water. She reacted the metal with steam

(i) Name the metal which reacts with cold water.

(ii) Which of the above metals react with steam?

(iii) Name the metal which reacts with hot water.

(iv) Arrange these metals in order of increasing reactivity.

Ans.3 (i) Na (ii) Al, Zn, Fe (iii) Mg (iv) Na>Mg> Al > Zn > Fe > Cu

Que4. A student was given Mg, Zn, Fe, and Cu metals. He put each of them in dil HCl contained in different test tubes. Identify which of  hem

(i) will not displace H2 from dil HCl

(ii) forms a pale green substance

(iii) will give H2 with 5% HNO3

(iv) will be displaced from its salt solution by all other metals.

Ans4: (i) Cu (ii) Fe (iii) Cu (iv) Cu

Que5. A metal `X` is found in the form of filings which burns vigorously when sprinkle on flame. When
these filings are treated with sulphur a black colured compound `Y` is formed which is not attracted by
magnet. `X` reacts with dil HCl to liberate hydrogen gas. Identify `X`, `Y``. Write the reaction involved.

Ans5 : Fe + S -> Fe S
`X` is Iron `Y` is Ferrous sulphide
Fe + HCl -> FeCl2 +H2
 
Que6. A, B and C are 3 elements which undergo chemical reactions according to following equations:
a) A2O3 + 2B -> B2O3 + 2A
b) 3CSO4 + 2B -> B2 (SO4)3 + 3C
c) 3CO + 2A -> A2SO3 + 3C Answer of the following:
i) Which element is most reactive?
ii) Which element is least reactive?
 
Ans.6 i) Most reactive element is B as it has replaced both A and C from their compounds
ii) Element C is least reactive as it has been replaced both by A and B.
 
Que7: Give reasons
i) Sodium, Potassium and Lithium are stored under oil.
ii) Addition of some silver to pure gold for making ornaments.
iii) Metals are good conductors of heat.
 
Ans7 i) These metals are very reactive so they can combine with moist air and oxygen vigorously with liberation of large amount of heat that is why they are kept in oil.
ii) Pure gold is very soft it is therefore not suitable for making jewelry . It is alloyed with either silver or
copper to make it hard.
iii)When a metal is heated, its atom gain energy and vibrate more vigorously. This energy is transferred to the electrons, which can move through the metal. They transfer their energy to other electrons and atoms. In this way they conduct heat and are good conductors.
 
Que8 : Why does aluminum not react with water under ordinary condition?
 
Ans: Aluminum forms a thin tough layer of oxide on its surface. this oxide layer forms a protective coating on the metal and prevents it from further attack of water.
 
Que 9 Metal sulphides occur mainly in rocks and the metal halides occur mostly in seas and lakes. What could be the reason for this?
 
Ans: Most of the metal sulphides are insoluble in water where as metal halides are generally soluble. the metal halides( NaCl , MgCl2 etc) are washed away with rain or river water in dissolved state and so the halide ores occur in lakes and seas.
 
Que10 Give the reason why copper is used to make hot water tanks but steel is not?
 
Ans: this is because iron present in steel reacts with steam to form ferrosoferric oxide whereas copper has no action with water . as a result of it , the body of steel tank becomes weaker and weaker in case of iron and not in case of copper.
3Fe + 4H2O --> Fe3O4 + 4H2

Please refer to link below for CBSE Class 10 Chemistry Hots-Metals and Non Metals.

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