Advertisements
Advertisements
प्रश्न
Fill in the following blank with suitable word:
Ordinary aluminium strips are not attacked by water because of the presence of a layer of ................. on the surface of aluminium.
Advertisements
उत्तर
Ordinary aluminium strips are not attacked by water because of the presence of a layer of aluminium oxide on the surface of aluminium.
APPEARS IN
संबंधित प्रश्न
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be:
Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).
A copper coin is kept immersed in a solution of silver nitrate for some time. What will happen to the coin and the colour of the solution?
What will happen if a strip of zinc is immersed in a solution of copper sulphate?
Complete and balance the following equation:
Fill in the following blank with suitable word:
Calcium is a ................. reactive metal than sodium.
Which of the following elements would yield a neutral oxide?
Na, S, C, K, H
How do metals react with hydrogen? Explain with an example.
Can we keep sodium immersed under water? Why?
Give one example, with equation, of the displacement of hydrogen by a metal from an acid.
Write the chemical equation of the reaction which takes place when iron reacts with dilute sulphuric acid. What happens when the gas produced is ignited with a burning matchstick?
Write the equation for the reaction of Magnesium with dilute hydrochloric acid.
Name the products formed. Also indicate the physical states of all the substances involved.
The elements whose oxides can turn litmus solution blue are:
(a) carbon and sulphur
(b) sodium and carbon
(c) potassium and magnesium
(d) magnesium and sulphur
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
Name a metal which It does not react with any physical state of water?
A zinc plate was kept in a glass container having CuSO4 solution. On examining it was found that the blue colour of the solution is getting lighter and lighter. After a few days, when the zinc plate was taken out of the solution, a number of small holes were noticed in it. State the reason and give chemical equation of the reaction involved.
Explain the following:
Reactivity of aluminium decrease if it is dipped in nitric acid.
Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?
(i) Good thermal conductivity
(ii) Good electrical conductivity
(iii) Ductility
(iv) High melting point
Metals are generally solid. Which of the following metals is in the liquid state at room temperature?
Tungsten wire is used in electric bulbs.
