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Chapter 8: Problem 43

Which of the following metals is soft in nature? (a) platinum (b) iron (c) aluminium (d) sodium

Short Answer

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a) Platinum b) Iron c) Aluminium d) Sodium Answer: d) Sodium

Step by step solution

01

Platinum:

Platinum is a precious metal with a shiny, silvery appearance. It is dense, malleable (can be hammered into thin sheets), and ductile (can be stretched into wires). However, it is not considered to be a soft metal.
02

Iron:

Iron is a lustrous, silvery-gray metal, and it is very common among metallic elements. It is strong, hard, and magnetic, making it ideal for use in construction and engineering applications. Iron is not a soft metal.
03

Aluminium:

Aluminium is a relatively soft, lightweight, and silvery-white metal. It has an excellent strength-to-weight ratio, which makes it ideal for many applications, including construction, transportation, and packaging industries. However, it is not as soft as some other metals.
04

Sodium:

Sodium is a soft, silvery-white, highly reactive alkali metal. Its softness allows it to be easily cut with a knife. Being highly reactive, it reacts quickly with water, so it is stored in mineral oil to prevent contact with air and moisture. Among the given options, sodium is the softest metal. Thus, the correct answer is (d) sodium.

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Most popular questions from this chapter

Equal masses of iron and sulphur are heated together to form FeS. What fraction of the original mass of excess reactant is left unreacted? \((\mathrm{Fe}=56\), \(\mathrm{S}=32\) ) (a) \(0.22\) (b) \(0.43\) (c) \(0.86\) (d) \(0.57\)

A volume of \(10 \mathrm{~m}\) l chlorine gas combines with \(25 \mathrm{~m}\) l of oxygen gas to form \(10 \mathrm{ml}\) of a gaseous compound. If all the volumes are measured at the same pressure and temperature, what is the molecular formula of compound formed? (a) \(\mathrm{Cl}_{2} \mathrm{O}\) (b) \(\mathrm{Cl}_{2} \mathrm{O}_{7}\) (c) \(\mathrm{ClO}_{2}\) (d) \(\mathrm{Cl}_{2} \mathrm{O}_{5}\)

A quantity of \(50 \mathrm{~g}\) of water is saturated with \(\mathrm{HCl}\) gas to get \(75 \mathrm{ml}\) of solution containing \(40 \%\) HCl, by mass. The density of solution formed is (a) \(1.11 \mathrm{~g} / \mathrm{ml}\) (b) \(0.4 \mathrm{~g} / \mathrm{ml}\) (c) \(0.9 \mathrm{~g} / \mathrm{ml}\) (d) \(0.99 \mathrm{~g} / \mathrm{ml}\)

Molecular mass of dry air is (a) less than moist air (b) greater than moist air (c) equal to moist air (d) may be greater or less than moist air

The volume strength of a sample of \(\mathrm{H}_{2} \mathrm{O}_{2}\) is \(8.96\) vol'. The mass of \(\mathrm{H}_{2} \mathrm{O}_{2}\) present in \(250 \mathrm{ml}\) of this solution is (a) \(0.4 \mathrm{~g}\) (b) \(27.2 \mathrm{~g}\) (c) \(6.8 \mathrm{~g}\) (d) \(108.8 \mathrm{~g}\)
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