Materials Metal...

Match the metals in the first column with their applications in the second column and the properties exploited in the third column:

Observe the following diagram:



In an activity to test the electrical conductivity of different substances, they were placed across the gap 'AB' in the circuit and the following observations were recorded.

In an activity to study the reaction of metals with acid, 20 ml of dilute sulphuric acid is taken in two test tubes. (Both the tubes should contain equal amounts and equal strengths of acid). 5 g of magnesium is taken in test tube A and 5 g of aluminium is taken in test tube B, and thermometers are placed in both the tubes.



Which of the following statements about the observations made is/are correct?

I. Both the reactions are exothermic and an increase in temperature is observed in both the test tubes.
II. Only the reaction with magnesium is exothermic and an increase in temperature is observed.
III. Both the reactions are exothermic, but the increase in temperature observed in test tube A is more.
IV. Both the reactions are exothermic, but the increase in temperature observed in test tube B is more.

Arrange metals A, B and C according to their order of reactivity.

Which of the following reactions cannot occur?

I. Cu(s) + 2HCl(aq) CuCl₂(aq) + H₂
II. 2Al(s) + 6HCl(aq) 2AlCl₃(aq) + 3H₂
III. Pb(s) + H₂SO₄(aq) PbSO₄(aq) + H₂(g)
IV. Cu(s) + MgSO₄(aq) CuSO₄(aq) + Mg(s)

The most reactive metal and non-metal, respectively, are

Which two of the following metals react violently with cold water?

Which two of the following elements dissolve in water to form hydroxides known as alkalies?

Which of the following metals do not react with H₂SO₄?

The most abundant element in the Earth's crust is

The corrosion of iron can be avoided by

When combined chemically with metal atoms, non-metal atoms tend to

Which of the following halogens is used as an antiseptic in an alcoholic solution?

Which among the following is an example of an alloy?

Which of the following compositions represents the German silver alloy?

On burning, metals react with oxygen to produce

Which among the following is a noble metal?

Which of the following statements is/are false?

a. The acidic, non-metal oxides turn blue litmus red.
b. Sulphur and phosphorus are the non-metals that are used in fireworks.
c. Non-metals react with dilute acids.

Solution(s) of which of the following with water turn(s) red litmus blue?

a. Magnesium oxide
b. Sulphur dioxide
c. Sodium oxide
d. Carbon dioxide

Raju is a student of class VIII and is curious to know the chemical nature of metals. While testing the chemical nature of metals, he noticed that a metal oxide reacts with dilute solutions of both acids and bases to produce hydrogen gas. This metal oxide is