Select Board & Class
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
Explain why conc. HNO3 can be stored in aluminium container
what are amphoteric oxides? give 2 examples
State three reasons for the following facts:
1)Sulphur is a non-metal.
2)Magnesium is a metal.
ONE OF THE REASONS MUST BE WITH A CHEMICAL EQUATION
please answer fast ...
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
which is the nonmetal having high melting point?
Most of the metals do not give hydrogen while reacting with nitric acid. Why ?
what happens when magnesium reacts with very dilute nitric acid. Write an eqution for the reaction involved
why tarnished copper vessels are cleaned with lime juice or tamarind
Explain with example - calcination and roasting
Which of the following metals are obtained by electrolysis of their chlorides in molten state ?
(i) Na (ii) Ca (iii) Fe (iv) Cu
(a) (i) and (iv) (b) (iii) and (iv) (c) (i) and (iii) (d) (i) and (ii)
(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???????
hw do we find whether a given element is a non metal if we know its electronic configuration?
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
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?
short note on hydraulic washing, froth-floatation process and magnetic separation method.
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 are ionic compounds are hard crystalline solids???
why oxdes of very reactive metals cannot be reduced with carbon ? how these metals are obtained from their ores?
Explain why iron articles are galvanized?
why zinc is used in the galvanisation of iron and not the copper?
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?
Why Magnesium , Manganese does react with dilute HNO3 to evolve hydrogen gas
while other metals dont produce hydrogen gas when reacted with HNO3
12. Name one metal each which is extracted by a)reduction with heat alone b)reduction with C c)reduction with Al. d)electrolytic reduction
name the gas evolved when dilute hcl reacts with sodium hydrogen carbonate. how is it recognised?
Name the constituents and uses of Brass,Bronze and Solder.
What is the difference b/w electrolytic reduction and electrolytic refining?
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.
Differenciate between Flux and Slag.
. What are antacids? Name two compounds which are used as antacids
An ore on heating in the absence of air gives carbon dioxide.
(a) Which method will you use to convert the ore into oxide form? Explain.
(b) Which type of ores afre calcined? Give examples.
(c) What do you understand by the term roasting? Give examples
give reasons why cooking utensils are made up of metals like copper, aluminium etc
why metal are not found in free state generally?
is H2SO4 an ionic compound or a covalent compound? what is the electronic dot structure of H2SO4 ?
Why are metals sonorous? Which metal is the most sonorous?
WITH A LABEL DIAGRAM DESCRIBE AN ACTIVITY TO SHOW THAT METALS ARE GOOD CONDUCTOR OF ELECTRIITY.
explain giving equation, what happens when:
ZNCO3 is heated in the absence of air?
a mixture of CU2O and CU2S is heated?
Is mercury(Hg) malleable and ductile?if yes i want to know how a liquid can be beaten into thin sheets and made into wires. If not i want to know how a metal cannot be malleable or ductile
) 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.
A, B and C are three elements which undergo chemical reactions according to the following equations.
Write the names and formulae of a) metal hydride , b) non metal hydride.
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
Name two metals which occur in the nature in the free state.
what is electrolytic reduction ???
How to remember REACTIVITY SERIES?
do u know how to keep reactivity series of metals in mind
a large no; of thin black strips are painted an a concave mirror ,the image on a distant white horse will be----------options-a] a zebra b]white horse c] black horse d]darker white house e]dimmer white horse.
metals are good conductors of electricity wheereas non metals are not .give reason
Which of the followin salts does not contain water of crystallisation
a) blue vitriol
b) baking soda
c) washing soda
metals replace hydrogen from acids whereas non metal do not. give reason
a non-metal 'A' is an important constituent of our food and forms two oxides 'B' and 'C' oxide 'B' is toxic where as 'C' causes global warming
1. identify 'A' 'B' AND 'C'
2. to which group of periodic table does it belong.
i cant understand these type of problems plzzzzzzzz tell me
Why Aluminium Oxide and Zinc Oxide is called Amphoteric Oxides?
An element X on reacting with oxygen forms an oxide X2O. This oxide dissolves in water and turns blue litmus red. State whether element X is metal or a non-metal.
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?
Name the type of compound formed between group 1st and group 17th. Write its two properties.
why sodium hydroxide can not be stored in aluminium containers ?
describe ionic compounds on the basis of the following properties :
name one metal and one non-metal which exist in liquid state at room temperature
(D) Existence of body centred cubic lattice
what is electrolytic refining ? explain
Aluminium occurs in combined state in nature whereas, gold occurs in free state. Why?
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