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Asked/Added Questions From NCERT:


Question 1. Asked on :20 August 2020:06:10:37 PM

What is non-metal?

-Added by Shruti Srivastva Science » Metal And Non Metals

Answer:

nisha sheikh
Non-metals are the elements which form negative ions by accepting or gaining electrons. An element or substance that is not a metal.

-Answered by nisha sheikh On 22 August 2020:09:52:04 AM


Question 2. Asked on :20 August 2020:06:10:13 PM

What is metal?

-Added by Shruti Srivastva Science » Metal And Non Metals

Answer:

nisha sheikh
Solid material which is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity (e.g. iron, gold, silver, and aluminium, and alloys such as steel).

-Answered by nisha sheikh On 22 August 2020:09:54:16 AM


Question 3. Asked on :22 March 2020:08:15:31 PM

Which is the more reactive metal?

-Added by Aman Senapati Science » Metal And Non Metals

Answer:

priyanshu kumar

 Potassium  (k) is the most reactive metal

-Answered by priyanshu kumar On 13 May 2020:02:30:03 PM


Question 4. Asked on :14 January 2020:09:24:18 AM

What are Ores?

-Added by Akki chauhan Science » Metal And Non Metals

Answer:

A??k Pal
A naturally occurring solid material from which a metal or valuable mineral can be extracted profitably. this is called Ores.

-Answered by A??k Pal On 16 January 2020:11:03:07 AM


Question 5. Asked on :14 January 2020:09:23:45 AM

What are Minerals?

-Added by Akki chauhan Science » Metal And Non Metals

Answer:

A??k Pal
Minerals are the substances that are formed naturally in the earth. this is called minerals.

-Answered by A??k Pal On 16 January 2020:11:03:33 AM


Question 6. Asked on :08 October 2019:11:06:16 AM

Define the following terms:-

(a) Minerals           (b) Ores            (c) Gangue

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

Rohit Rajput

 Minerals: These are combined state of metals generally with non metals

Ores: The minerals from which metals can be conveniently extracted are called an ore.

Gangue: It represents the earthy impurities such as mud, sand and dust.

-Answered by Rohit Rajput On 11 October 2019:08:23:42 PM


Question 7. Asked on :08 October 2019:11:01:48 AM

Why is titatnium metal called as strategic metal? Mention two of its properties which makes it so special.

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

Rohit Rajput

Titanium is called strategic metal because it is used for making certain war equipments.

1) It is light in weight but stronger.

2) It is not affected by corrosion even if kept open for a very long time.

-Answered by Rohit Rajput On 11 October 2019:08:24:01 PM


Question 8. Asked on :08 October 2019:10:57:59 AM

Give reason, why copper is used to make hot water tanks and not steel(an alloy of iron)?

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

Rohit Rajput

 Electrical conductivity of a metal is decreased when it is alloyed with another metal or non- metal. Thus, the electrical conductivity of a steel is much less than that of pure that is why copper is used to make hot water tanks and not steel.


-Answered by Rohit Rajput On 11 October 2019:08:24:42 PM


Question 9. Asked on :08 October 2019:10:56:09 AM

Name the metal which reacts with cold water.

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

Rohit Rajput

 Sodium reacts with cold water.


-Answered by Rohit Rajput On 11 October 2019:08:24:51 PM


Question 10. Asked on :28 September 2019:07:46:26 AM

What is the element present on lead pencil?

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

priyanshu kumar
 Graphite (carbon)

-Answered by priyanshu kumar On 30 September 2019:11:30:57 AM


Question 11. Asked on :28 September 2019:07:36:32 AM

Which is the purest form of carbon?

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

priyanshu kumar
 Graphite.

-Answered by priyanshu kumar On 30 September 2019:11:31:54 AM


Question 12. Asked on :06 September 2019:08:01:31 PM

 What is malleability?

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

Rohit Rajput
Some metals can be beaten into thin sheets. This property of metals is called malleability.

-Answered by Rohit Rajput On 06 September 2019:08:29:51 PM


Question 13. Asked on :06 September 2019:07:57:59 PM

 Write the three allotropes of carbon.

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

Rohit Rajput

1. Diamond

2. Graphite

3. Buckminsterfullerenc

-Answered by Rohit Rajput On 06 September 2019:08:21:42 PM


Question 14. Asked on :06 September 2019:07:53:25 PM

 What is ores?.

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

priyanshu kumar

  The minerals contain a very high percentage of a particular metal and the metal can be profitably extracted from it. These minerals are called ores.


-Answered by priyanshu kumar On 12 October 2019:04:26:31 PM


Question 15. Asked on :06 September 2019:07:51:54 PM

 What is gangue?

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

priyanshu kumar
 Ores mined from the earth are usually contaminated with large amount of impurities such as soil, sand etc are called gangue.

-Answered by priyanshu kumar On 12 October 2019:04:26:39 PM


Question 16. Asked on :06 September 2019:07:50:34 PM

 What is minerals?

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

priyanshu kumar
The elements or compounds which  occur naturally in the earth crust is called minerals. 

-Answered by priyanshu kumar On 12 October 2019:04:26:54 PM


Question 17. Asked on :06 September 2019:07:47:14 PM

 What is roasting?

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

priyanshu kumar
The sulphide ores are converted into oxides by heating strongly in the presence of excess air. This process is called roasting.

-Answered by priyanshu kumar On 06 October 2019:09:53:29 AM


Question 18. Asked on :02 September 2019:07:49:04 PM

 Write the types of covalent bonds?

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

priyanshu kumar

 Covalent bonds are three types:- 

1. Single covalent compound

2. Double covalent compound 

3. Triple covalent compound


-Answered by priyanshu kumar On 10 October 2019:11:27:34 AM


Question 19. Asked on :02 September 2019:05:08:16 PM

 Sate two ways to prevent the rusting of iron?

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

Akki chauhan

 1. By painting on iron articles.

2. By alloying.

3. By using anti- rusting solution.

-Answered by Akki chauhan On 02 September 2019:08:55:38 PM


Question 20. Asked on :02 September 2019:05:06:53 PM

 What chemical process is used for obtaining a a metal from its oxide? 

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

priyanshu kumar
Reduction is the chemical process which is used for obtaining a metal from its oxide

-Answered by priyanshu kumar On 13 October 2019:10:33:27 AM


Question 21. Asked on :02 September 2019:04:56:28 PM

 What do you mean by thermite reaction?

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

priyanshu kumar

 The reduction of a metal oxide to form metals by using aluminium powder as a reducing agent is called thermite reaction.


-Answered by priyanshu kumar On 13 October 2019:10:41:49 AM


Question 22. Asked on :29 August 2019:06:27:08 PM

 What type of bond are present in hydrogen chloride and oxygen?

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

Nishant Verma
 A polar covalent bond exists when atoms with different electro negativities share electrons in a covalent bond. Consider the hydrogen chloride (HCl) molecule.

-Answered by Nishant Verma On 30 August 2019:03:00:18 PM


Question 23. Asked on :29 August 2019:06:18:09 PM

 What do you mean by covalent bond?

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

Nishant Verma
 The chemical bond formed by the sharing of electrons between two atoms is known as covalent bonds.

-Answered by Nishant Verma On 30 August 2019:03:00:55 PM


Question 24. Asked on :29 August 2019:06:17:05 PM

 Which metal foil is used for packing some of the medicine tablets?

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

Rohit Rajput

 Aluminium is a very useful material used for different purposes, and one of such important purpose is to be used as foils for medicines. It is light, flexible and versatile which makes it a perfect material for using as a medical foil to keep the medicines safe.

-Answered by Rohit Rajput On 29 August 2019:08:41:48 PM


Question 25. Asked on :29 August 2019:06:16:17 PM

 Name two metals which form amphoteric oxides.

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

Rohit Rajput

 In chemistry, an amphoteric compound is a molecule or ion that can react both as an acid as well as a base. Many metals (such as copper, zinc, tin, lead, aluminium, and beryllium) form amphoteric oxides or hydroxides. Amphoterism depends on the oxidation states of the oxide.

-Answered by Rohit Rajput On 29 August 2019:08:42:28 PM


Question 26. Asked on :29 August 2019:06:14:46 PM

 What is aqua regia? Name two special metals which are insoluble in common reagents but dissolve in aqua regia.

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

Nishant Verma
Aqua regia, also called Royal water, is a mixture of hydrochloric acid and nitric acid in a molar ration of 3:1. It is called so because it can dissolve the noble metals like platinum and gold. So, the two special metals which are insoluble in common reagent but dissolve in Aqua regia can be Gold and platinum.

-Answered by Nishant Verma On 30 August 2019:03:58:32 PM


Question 27. Asked on :29 August 2019:06:14:02 PM

 Name the metal which is poorest conductor of heat.

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

Rohit Rajput

 The poorest conductor of heat among metals is Bismuth. Stainless steel is another one that is a poor conductor of heat, and you use this often in everyday life! Other poor conductors include titanium, lead and chromium. And most ironically, Mercury, the liquid metal used in thermometers.

-Answered by Rohit Rajput On 29 August 2019:08:43:01 PM


Question 28. Asked on :29 August 2019:06:13:07 PM

 Name one metal which has a low melting point.

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

Rohit Rajput

 Mercury has the very low melting point.

-Answered by Rohit Rajput On 30 August 2019:08:54:47 AM


Question 29. Asked on :29 August 2019:06:11:40 PM

 Explain why, the surface of some metals acquires a dull appearance when exposed to air for a long time.

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

Rohit Rajput
The surface of some metals acquires a dull appearance when exposed to air for a long time due to the formation of a thin layer of oxide, carbonate or sulphide on their surface by the slow action of the various gases present in air.

-Answered by Rohit Rajput On 30 August 2019:08:55:31 AM


Question 30. Asked on :29 August 2019:06:10:58 PM

 Name two non- metals which are both brittle and non- ductile.

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

Rohit Rajput
Phosphorus and Sulphur.

-Answered by Rohit Rajput On 31 August 2019:09:41:17 AM


Question 31. Asked on :29 August 2019:06:09:26 PM

 Which property of graphite is utilised in making electrodes.

-Added by Himanshi Verma Science » Metal And Non Metals

Answer:

Akki Chauhan2
conductive
Graphite or "graphite paste" is used for electrodes because a) it is conductive b) it is inexpensive c) it can continuously expose a "fresh" surface

-Answered by Akki Chauhan2 On 29 August 2019:08:56:30 PM


Question 32. Asked on :20 August 2019:10:33:59 AM

What will happen if the sodium of sodium hydrogen carbonate is heated give the equation of the reaction involved?

-Added by Akki chauhan Science » Metal And Non Metals

Answer:

Akki chauhan

When the solution of sodium hydrogen carbonate is heated it is decomposed into sodium carbonate water and carbon dioxide the following reaction takes place when sodium hydrogen carbonate is heated.

-Answered by Akki chauhan On 20 August 2019:10:35:09 AM


Question 33. Asked on :19 August 2019:09:54:33 PM

Surface of some metal lose their brightness when kept in air for a long time why?

-Added by Akki chauhan Science » Metal And Non Metals

Answer:

Himanshi Verma

 The reaction with constituents of air (oxygen, carbon dioxide, moisture etc) to form compound.

-Answered by Himanshi Verma On 19 August 2019:10:25:12 PM


Question 34. Asked on :28 June 2019:10:27:18 AM

 write the chemical properties of metal ?

-Added by Akki chauhan Science » Metal And Non Metals

Answer:

Himanshi Verma

 1. Metal have high M.P and B.P.

2.  Metal are good conductor of heat and electricity.

3. Metals react with air and corrode.

-Answered by Himanshi Verma On 01 July 2019:07:31:12 PM


Question 35. Asked on :28 June 2019:10:26:10 AM

 What is thermit reaction?

-Added by Akki chauhan Science » Metal And Non Metals

Answer:

Himanshi Verma

 Thermit reaction is the reaction in which 3 parts of iron oxide and one part of aluminium is taken and ignited by burning magnesium and barium peroxide. Aluminium is reducing agent so it reduces iron oxide to molten iron.

-Answered by Himanshi Verma On 02 July 2019:07:24:36 PM


Question 36. Asked on :28 June 2019:10:26:10 AM

 What is thermit reaction?

-Added by Akki chauhan Science » Metal And Non Metals

Answer:

Shalu Shukla

 Thermit reaction is the reaction in which three parts of iron oxide and one part of alumminum is taken and ignited by burning magnesium and barium peroxide.

-Answered by Shalu Shukla On 18 July 2019:07:01:46 PM


 

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