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Mansha
Subject: Science
, asked on 21/5/18
Why sodium is represented as Nain a
Answer
1
Mansha
Subject: Science
, asked on 21/5/18
Why sodium is representedas Na Why sodium is represented as any
Answer
1
Krithi ♀️
Subject: Science
, asked on 9/5/18
Pls solve experts
Q. What is the focal length of a line that produces a real image three times as large as the object if the distance between image and object is 1 m?
Answer
2
Siddhi
Subject: Science
, asked on 17/3/18
In question (a) I wrote the answer in a flow chart manner like ore —>concentration of ore —>carbonates—>calcination—>oxide of ore—>reduction—>purification of impure metal by electrolytic refining. Will I get full marks for this question ?? Plzzz tell:
(a) Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.
(b) How is copper extracted from its sulphide ore ? Explain the various steps supported by chemical equations. Draw labelled diagram for the electrolytic refining of copper.
Answer
4
Jahnvi Singh
Subject: Science
, asked on 16/3/18
Why are metals good conductors of electricity while glass are not
Answer
2
Sonali Singh
Subject: Science
, asked on 16/3/18
Properties of ionic compounds??
Answer
4
Moin
Subject: Science
, asked on 16/3/18
write an activity to show how metals and non-metals reacts with sodium hydroxide..... plz fast......no link
Answer
1
Nishant Kumar
Subject: Science
, asked on 15/3/18
what happens when sodium hydroxide is heated
Answer
2
I.balavaseekaran Ilango
Subject: Science
, asked on 15/3/18
Define
Mineral
Ore
Amalgum
Cinnabar
Answer
1
Samyuktha M. S
Subject: Science
, asked on 15/3/18
Solve this:
Q.14. No chemical reaction takes place when granules of a solid, A, are mixed with the powder of another solid, B. However when the mixture is heated, a reaction takes place between its components. One of the products, C, is a metal and settles down in the molten state while the other product, D, floats over it. It was observed that the reaction is highly exothermic.
(i) Based on the given information make an assumption about A and B and write a chemical equation for the chemical reaction indicating the conditions of reaction, physical state of reactants and products and thermal status of reaction.
(ii) Mention any two types of reactions under which above chemical reaction can be classified.
Answer
1
Aishwarya.t Thirumurugan
Subject: Science
, asked on 15/3/18
Can we store silver nitrate solution in copper vessels? Give reason
Answer
5
Divyansh
Subject: Science
, asked on 14/3/18
water helps in separation of oppositely charged ions from their ionic bond give reason
Answer
2
Aditya Anand
Subject: Science
, asked on 14/3/18
What observations can be noted when Al is added to NaOH
Answer
6
Sameer Ahmed
Subject: Science
, asked on 14/3/18
Is anodizing similar to galvanization except for the metal used??
Answer
2
Harini
Subject: Science
, asked on 14/3/18
difference between aluminothermi and thermit reation
Answer
2
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Q. What is the focal length of a line that produces a real image three times as large as the object if the distance between image and object is 1 m?
(a) Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.
(b) How is copper extracted from its sulphide ore ? Explain the various steps supported by chemical equations. Draw labelled diagram for the electrolytic refining of copper.
Mineral
Ore
Amalgum
Cinnabar
Q.14. No chemical reaction takes place when granules of a solid, A, are mixed with the powder of another solid, B. However when the mixture is heated, a reaction takes place between its components. One of the products, C, is a metal and settles down in the molten state while the other product, D, floats over it. It was observed that the reaction is highly exothermic.
(i) Based on the given information make an assumption about A and B and write a chemical equation for the chemical reaction indicating the conditions of reaction, physical state of reactants and products and thermal status of reaction.
(ii) Mention any two types of reactions under which above chemical reaction can be classified.