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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.
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उत्तर
Ordinary aluminium strips are not attacked by water because of the presence of a layer of aluminium oxide on the surface of aluminium.
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संबंधित प्रश्न
Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).
How would you show that silver is chemically less reactive than copper?
Give reason for the following:
Blue colour of copper sulphate solution is destroyed when iron filings are added to it.
Complete and balance the following equation:
Cu (NO3)2 (aq) + Zn(s) →
Which non-metal has been placed in the reactivity series of metals?
An element X forms two oxides XO and XO2. The oxide XO is neutral but XO2 is acidic in nature. The element X is most likely to be:
(a) sulphur
(b) carbon
(c) calcium
(d) hydrogen
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
Zinc oxide is a metal oxide. Which of the following term best describes the nature of zinc oxide:
(a) an acidic oxide
(b) a basic oxide
(c) an amphoteric oxide
(d) a neutral oxide
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 E reacts with water to form a solution which turns phenolphthalein solution pink. The element E is most likely to be:
(a) S
(b) Ca
(c) C
(d) Ag
Which of the following pair of reactants can undergo a displacement reaction under appropriate conditions?
(a) MgSO4 + Fe
(b) ZnSO4 + Fe
(c) MgSO4 + Pb
(d) CuSO4 + Fe
State and explain the reaction, if any, of the following metals with a solution of copper sulphate:
(a) Gold
(b) Copper
(c) Zinc
(d) Mercury
What is the characteristic of the electronic configuration of noble gases?
Write the chemical equation of the above process.
Rewrite the following statement by selecting the correct option.
A solution of Al2(SO4)3 in water is _____________.
The substance that will be flattened on beating with a hammer is ______.
Tungsten wire is used in electric bulbs.
Why is acidified water considered to be a good conductor of electricity?
