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What is"hydraulic washing" or "gravity separation"?explain with diagram
the galvanised article is protected against rusting even if zinc coating is broken
why are metals called electropositive elements whereas non-metals are called electronegative elements?
Hydrogen gas is not evolved when nitric acid reacts with metals but magnesium and manganese metals react with nitric acid to produce hydrogen gas,why??HOW?
difference between calcination and roasting
what are amphoteric oxides? give 2 examples
alloys are used in electrical heating device rather than pure metal .give two reasons for this statement ?
what is the nature of metal oxide and non metallic oxide? give reason
Most of the metals do not give hydrogen while reacting with nitric acid. Why ?
why tarnished copper vessels are cleaned with lime juice or tamarind
Explain with example - calcination and roasting
(i) Explain the steps for extraction of copper from its sulphide ore. Write the balanced equations involved in the process. (ii) What is meant by refining of metals ? Draw a diagram of electrolytic refining of copper and name the substances used as cathode, anode and the electrolyte.
what are the uses of metals and non -metals???????
Explain why conc. HNO3 can be stored in aluminium container
why are metals sulphide and carbonate converted into metal oxide prior to reduction during the extraction of metals . explain by giving one example in each case
Non metal generally donot displaces hydrogen from dilute acid ? why
why electric wire coated with PVC ?
why metal oxides are basic in nature?
copper vessels get a green coat when exposed to air in rainy season
why oxdes of very reactive metals cannot be reduced with carbon ? how these metals are obtained from their ores?
why zinc is used in the galvanisation of iron and not the copper?
Why Magnesium , Manganese does react with dilute HNO3 to evolve hydrogen gas
while other metals dont produce hydrogen gas when reacted with HNO3
An ore on treatment with dilute hydrochloric acid produces brisk effervescence. What type of ore is this? What steps will be required to obtain metal from the enriched ore?
name the gas evolved when dilute hcl reacts with sodium hydrogen carbonate. how is it recognised?
What is the difference b/w electrolytic reduction and electrolytic refining?
Name the constituents and uses of Brass,Bronze and Solder.
1)Gold ans silver are used to make jewellery.
2)Carbonate and sulphide ores are usually converted into oxides prior to reduction during the process of extraction.
why metal are not found in free state generally?
Differenciate between Flux and Slag.
. What are antacids? Name two compounds which are used as antacids
give reasons why cooking utensils are made up of metals like copper, aluminium etc
Write the electron dot structure for sodium and chlorine atoms. How do these form a chemical Bond? Name the type bond so formed why does a compound so formed have high melting point?
is H2SO4 an ionic compound or a covalent compound? what is the electronic dot structure of H2SO4 ?
) Define an alloy. How are alloys prepared ? How do the properties of iron change when : (i) small quantity of carbon, (ii) nickel and chromium are mixed with it.
Why are metals sonorous? Which metal is the most sonorous?
explain giving equation, what happens when:
ZNCO3 is heated in the absence of air?
a mixture of CU2O and CU2S is heated?
A, B and C are three elements which undergo chemical reactions according to the following equations.
metals are good conductors of electricity wheereas non metals are not .give reason
metals replace hydrogen from acids whereas non metal do not. give reason
Explain how the following metals are obtained from their compounds by the reduction process.
1) metal X which is low in the reactivity series
2) metal Y which is the middle of the reactivity series
3) metal Z which is high in the reactivity series
.Give an eg of each
what is electrolytic reduction ???
How to remember REACTIVITY SERIES?
do u know how to keep reactivity series of metals in mind
Why Aluminium Oxide and Zinc Oxide is called Amphoteric Oxides?
Why hydrogen comes in reactivity series of metals????andHow reactivity of hydrogen can be found out????????
name the metal which reacts with a very dilute HNO3 to evolve hydrogen gas?
why sodium hydroxide can not be stored in aluminium containers ?
name one metal and one non-metal which exist in liquid state at room temperature
Aluminium occurs in combined state in nature whereas, gold occurs in free state. Why?
what is electrolytic refining ? explain
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