Metals and Non-metals Test - 12

Sonority (of a material) is the property of producing a ringing sound when struck. Most metals are sonorous. Therefore, they are used in many instruments (eg. cymbals and bells). Almost all non-metals are non-sonorous, i.e. they don't produce a ringing sound when struck.

Hence, the correct option is (C).

The metal that burns with dazzling white flame is the one and only magnesium element. 'Magnesium' burns in oxygen to produce Magnesium oxide with a dazzling white flame.

Chemical reaction involves:

$2Mg\left(s\right)+O_2\left(g\right)\to 2MgO\left(s\right)+energy$

Hence, the correct option is (A).

Phosphorus is the non-metal, which is stored underwater at room temperature.

As it is a very reactive non-metal when it comes in contact with $O_2$, it reacts with it and catches fire. To prevent this it is kept in water to cut its contract with $O_2$.

Hence, the correct option is (B).

Zinc lies between magnesium and lead in the reactivity series

Reactivity series of metals and nonmetals are the lists, in which we arrange them in the decreasing order of their chemical activity. It is also known as the activity series. The reactivity series helps us to predict the capability of a metal to displace another metal during a displacement reaction.

Hence, the correct option is (D).

The heat is transferred directly from one particle to another due to vibrations in the process of conduction. But in the case of mercury, the heat does not get transferred from one particle to another directly as compared to other materials (like gold, silver copper which are good conductors of heat.) Thus, mercury is a comparatively poor conductor of heat. 

Hence, the correct option is (B).

Hence, the correct option is (D).

Copper is used in a variety of applications, one of which is electrical wires. Whether it’s a power cable for a TV, computer, kitchen appliance or construction tool Following are the properties due to which copper is used for making electrical wires:

(a)High electrical conductivity: This means electricity can pass through it with greater ease, making it ideal for use in electrical wires.

(b)Malleability: It is a physical property of metals that defines their ability to be hammered, pressed, or rolled into thin sheets without breaking.

(c)Ductility: It is the physical property of a material associated with the ability to be hammered thin or stretched into wire without breaking

Copper is ductile and it can easily be transformed in form of wires

Hence, the correct option is (C).

Metals, in general, are hard as solids at room temperature but sodium is a metal that is exceptional. Sodium is stored in kerosene and is soft that it can be cut with a knife.

Hence, the correct option is (A).

Bronze consists of 85-88% copper, 12-12.5% tin, and with the addition of some other metals like aluminium, manganese, zinc or nickel in small proportions. This mixture is made to improve the properties of copper.

Hence, the correct option is (B).

Sodi­um is an el­e­ment in the 1ˢᵗ group of the 3ʳᵈ pe­ri­od of the Pe­ri­od­ic Ta­ble. It is a sil­very-white met­al. It is quite mal­leable and soft (metal­lic sodi­um can eas­i­ly be cut with a knife or scalpel, and a fresh cut shines in the air). It has high ­con­duc­tiv­i­ty.

It has a low melting point and reacts vigorously with water.

Chemical reaction:

$2Na\left(s\right)+2H_{2}O\to 2NaOH\left(aq\right)+H_2\left(g\right)$

Hence, the correct option is (D).

An amphoteric compound is a molecule or ion that can react both as an acid as well as a base. Many metals (such as copper, zinc, tin, lead, aluminium, and beryllium) form amphoteric oxides or hydroxides. Amphoterism depends on the oxidation state of the oxide.

Zinc oxide $\left(ZnO\right)$ reacts with both acids and bases:

In acid: $ZnO+2H^{+}\to Z{n}^{2+}+H_{2}O$

In base: $ZnO+H_{2}O+2O{H}^{-}\to {\left[Zn{\left(OH\right)}_4\right]}^{2-}$

Aluminium oxide:

with acid: $A{l}_2{O}_3+3H_{2}O+6H_3{O}^{+}\left(aq\right)\to 2{\left[Al{\left(H_{2}O\right)}_6\right]}^{3+}\left(aq\right)$

with base: $A{l}_2{O}_3+3H_{2}O+2O{H}^{-}\left(aq\right)\to 2{\left[Al{\left(OH\right)}_4\right]}^{-}\left(aq\right)$

Hence, the correct option is (D).

Water is a covalent compound. A  single water molecule consists of an oxygen atom attached to two hydrogen atoms. Each of the hydrogen atoms is bound to the oxygen atom through a covalent bond

Water has a covalent bond because of the nature of oxygen and hydrogen, they share electrons to attain stability, and their electronegativities are close enough for their bond to be considered covalent. 

Covalent bond: The bond form between two atoms by mutual sharing of their electrons is known as a covalent bond and the compound is known as a covalent compound.

Hence, the correct option is (D).

Copper metal when exposed to air turns green in colour due to corrosion. When the copper vessel is exposed to air in the rainy season, the metal reacts with gases and moisture and atmospheric gases to form a mixture of copper carbonate and copper hydroxide. This gives a green colour to the surface of copper metal.

The reaction is as follows:

$2Cu+H_{2}O+C{O}_2+O_2\to Cu{\left(OH\right)}_2+CuC{O}_3$

Hence, the correct option is (A).

The electrolysis of copper chloride is a way of splitting up (decomposition) of the compound (copper chloride) using electrical energy. The electrical energy comes from a d.c. (direct current) battery or power pack supply. A conducting liquid, containing ions, called the electrolyte (aqueous or molten sodium chloride), must contain the compound (copper chloride) that is being broken down. The electricity must flow through electrodes dipped into the electrolyte to complete the electrical circuit with the battery.

The electrolyte copper(II) chloride, provides a high concentration of copper(II) ions Cu²⁺ and chloride ions Cl^– to carry the current during the electrolysis process.

Hence, the correct option is (D).

Non-polar compounds are easily dissolved in a non-polar solvent, as like dissolves like. So, benzene can be used as a solvent to dissolve the non-polar compounds.

Hence, the correct option is (D).