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?
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 ...
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
Two coils C1 and C2 are wrapped around a non conducting cylinder. Coil C1 is
what are amphoteric oxides? give 2 examples
why metal are not found in free state generally?
alloys are used in electrical heating device rather than pure metal .give two reasons for this statement ?
Name two metals alloyed with iron to make stainless steel.
what is the nature of metal oxide and non metallic oxide? give reason
2Al(s) + 3H2O(g) -------- Al2O3(s) + 3H2(g)
why in the above reaction metal oxide is formed? why not metal hydroxide?
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
(b) How is sodium obtained from molten sodium chloride ? Give equation of the reactions.
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???????
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.
Explain why conc. HNO3 can be stored in aluminium container
(i) Show the formation of magnesium chloride and sodium chloride by transfer of electrons.
(ii) Identify the ions present in these compounds ?
(iii) Why do ionic compounds not conduct electricity in the solid state
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
out of the 2 metals P and Q P is less reactive than Q, suggest an activity to arrange thyese matals in the order of their decreasing reactivity. support your answer with a suitable chemical equation.
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
. State the chemical change that takes place when lime stone is heated strongly
why oxdes of very reactive metals cannot be reduced with carbon ? how these metals are obtained from their ores?
Is sodium nitrate, an acidic or a basic salt?
why zinc is used in the galvanisation of iron and not the copper?
In what forms are metal found in nature? With the help of examples explain how metals react with oxygen, water and dilute aicds. Also write chemical equations for the reaction.
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?
WITH A LABEL DIAGRAM DESCRIBE AN ACTIVITY TO SHOW THAT METALS ARE GOOD CONDUCTOR OF ELECTRIITY.
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.
Which isa strong oxidising agent -- hno3 or h2so4? Please answer only if you are sure.
Differenciate between Flux and Slag.
. What are antacids? Name two compounds which are used as antacids
Why calcium and magnesium are found in the form of compounds only in nature and gold and platinum are found in its free state?
give reasons why cooking utensils are made up of metals like copper, aluminium etc
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.
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?
which metal occurs in free state in the earth's crust
is H2SO4 an ionic compound or a covalent compound? what is the electronic dot structure of H2SO4 ?
Write four important purposes of making alloy. Write the constituents of following alloys : (i) Brass (ii) Bronze (iii) Solder (iv) Stainless Steel.
) 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?
What is the difference between galvanising and and electroplating?
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.
WRITE ONE SIMILARITY AND DISIMILARITY BETWEEN ROASTING AND CALCINATION
metals replace hydrogen from acids whereas non metal do not. give reason
metals are good conductors of electricity wheereas non metals are not .give reason
Two electronic configuration of three elements X,Y and Z are as follows :
X=2,4 Y=2,7 Z=2,1 Two of these elements will combine to form an ionic compound. Write the chemical formula of the compound .
a) X2Y b) YZ c) ZY d) XZ4
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?
Why is copper sulphate not stored in aluminium vessel?
do u know how to keep reactivity series of metals in mind
X,Y,Z are 3 elements which undergo chemical reactions according to the following reactions:
1) Y2O3 +2X --- X2O3 +2Y
2) ZSO4 +2X --- X2(SO4)3 +3Z
3) 3ZO +2Y --- Y2O3 +3Z
Which among X, Y , Z is most reactive?
Why Aluminium Oxide and Zinc Oxide is called Amphoteric Oxides?
Why is glass wool used for the expire meant to test the action of steam on 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?
why sodium hydroxide can not be stored in aluminium containers ?
3HCl(hydrochloride acid)+HNO3(nitric acid)=?
what is the chemical name for the compound so formed?
give its 2 more names.
name one metal and one non-metal which exist in liquid state at room temperature
Answer the following Questions :
1.Compare the properties of a typical metal and a non-metal on the basis of the following. Fill in Column A, B.
2.Name the following :1) A molten metal that catches fire in chlorine gas and gives off white fumes2) A metal that forms two types of oxides and rusts in moisture; write their formulae also3) A metal used in hot water systems4) A metal used in long distance cables wires5) A metal added to gold to harden it
3.A copper plate was dipped in AgNO3solution. After certain time silver from the solution was deposited on the copper plate. State the reason why it happened. Give the chemical equation of the reaction involved.
4.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.
5.Metals replace hydrogen from acid, whereas non-metals do not. Why?
6.Why are the two non-metals, carbon and hydrogen are important chemical reference points with regard to the method of metal extraction and reactivity towards acids.
7.a) What is the behaviour of magnesium when it is heated and steam is passed over it? Represent the equation. b) Can carbon dioxide react with magnesium?
8.A zinc rod was kept in a glass container having CuSO4solution. On examining, it was found that the blue colour of the solution had faded. After few days when the zinc rod was taken out of the solution, a number of small holes were noticed in it. State the reason and give equation of chemical reaction involved.
Aluminium occurs in combined state in nature whereas, gold occurs in free state. Why?
write balanced chemical equation
what is electrolytic refining ? explain
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