Advertisements
Advertisements
प्रश्न
Give reason for the following:
Blue colour of copper sulphate solution is destroyed when iron filings are added to it.
Advertisements
उत्तर
When iron fillings are added to copper sulphate solution, iron will displace copper to form iron sulphate. The blue colour of the copper sulphate solution changes to green as iron sulphate is green in colour.
APPEARS IN
संबंधित प्रश्न
Metal A has electronic configuration (2, 8, 1) and metal B has (2, 8, 8, 2). Which is more reactive? Why? Identify these metals.
Why are metals called electropositive elements whereas non-metals are called electronegative elements?
What changes in the colour of iron nails and copper sulphate solution do you observe after keeping the iron nails dipped in copper sulphate solution for about 30 minutes?
Name the metal which has been placed just below copper in the reactivity series.
Complete and balance the following equation:
Complete and balance the following equation:
Cu (NO3)2 (aq) + Zn(s) →
With the help of examples, describe how metal oxides differ from non-metal oxides.
How do metals react with hydrogen? Explain with an example.
What happens when calcium reacts with chlorine? Write an equation for the reaction which takes place
Arrange the following metals in order of their chemical reactivity, placing the most reactive metal first:
Magnesium, Copper, Iron, Sodium, Zinc, Lead, Calcium.
Why does aluminium not react with water under ordinary conditions?
Name two metals which cannot displace hydrogen from dilute acids.
The metals which can produce amphoteric oxides are:
(a) sodium and aluminium
(b) zinc and potassium
(c) calcium and sodium
(d) aluminium and zinc
The elements whose oxides can turn litmus solution red are:
(a) lithium and sodium
(b) copper and potassium
(c) carbon and hydrogen
(d) phosphorus and sulphur
A metal less reactive and another metal more reactive than hydrogen are:
(a) aluminium and lead
(b) iron and magnesium
(c) copper and tin
(d) copper and mercury
An element X forms two oxides XO and XO2. The oxide XO has no action on litmus solution but oxide XO2 turns litmus solution red.
(a) What is the nature of oxide XO?
(b) What is the nature of oxide XO2?
(c) Would you call element X a metal or a non-metal? Give reason for your choice.
(d) Can you give an example of element like X?
Answer the following question:
An element X on reacting with oxygen forms an oxide X2O. This oxide dissolves in water and turns red litmus blue. State whether element X is metal or a non - metal. Explain with a proper example.
Arrange the following metals in the increasing order of their reactivities:
Copper, Zinc, Aluminium, and Iron
Write the chemical equation for the following reaction:
Manganese dioxide is heated with aluminum powder.
An alkali metal A gives a compound B (molecular mass = 40) on reacting with water. The compound B gives a soluble compound C on treatment with aluminium oxide. Identify A, B and C and give the reaction involved.
