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Important Questions: Materials: Metals And Non Metals


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20 Questions MCQ Test Science & Technology for UPSC CSE | Important Questions: Materials: Metals And Non Metals

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Important Questions: Materials: Metals And Non Metals - Question 1

The most reactive metal is:

Detailed Solution for Important Questions: Materials: Metals And Non Metals - Question 1

Potassium is more reactive than Sodium and Lithium because Potassium is bigger than them. So outermost electron is farther away from nucleus. So the ionization energy in K is less than that in Na or in Li. So Potassium is more reactive than many other metals.

Important Questions: Materials: Metals And Non Metals - Question 2

The liquid metal at room temperature is:

Detailed Solution for Important Questions: Materials: Metals And Non Metals - Question 2

The correct option is A.
Liquid metal consists of alloys with very low melting points which form a eutectic that is liquid at room temperature. The standard metal used to be mercury, but gallium-based alloys, which are lower both in their vapor pressure at room temperature and toxicity, are being used as a replacement in various applications.

Important Questions: Materials: Metals And Non Metals - Question 3

Non-metals are:

Detailed Solution for Important Questions: Materials: Metals And Non Metals - Question 3 Seventeen elements are generally classified as nonmetals; most are gases (hydrogen, helium, nitrogen, oxygen, fluorine, neon, chlorine, argon, krypton, xenon and radon); one is a liquid (bromine), and a few are solids (carbon, phosphorus, sulfur, selenium, and iodine).
Important Questions: Materials: Metals And Non Metals - Question 4

The metal which is stored in kerosene:

Detailed Solution for Important Questions: Materials: Metals And Non Metals - Question 4 Because sodium catches fire in normal air .
Important Questions: Materials: Metals And Non Metals - Question 5

The non-metal which is liquid at room temperature is:

Detailed Solution for Important Questions: Materials: Metals And Non Metals - Question 5

Metals that are liquids at room temperature are mercury (Hg) and gallium (Ga).

Non-metals liquid at room temperature - bromine (Br).

However, other elements such as caesium (Cs), rubidium (Rb) and francium (Fr) also become liquids at a few degrees above room temperature.

Important Questions: Materials: Metals And Non Metals - Question 6

Materials around us can be classified into

Important Questions: Materials: Metals And Non Metals - Question 7

All metals are solids except

Important Questions: Materials: Metals And Non Metals - Question 8

Metal oxides are of nature

Important Questions: Materials: Metals And Non Metals - Question 9

The metal which can be cut with a knife

Detailed Solution for Important Questions: Materials: Metals And Non Metals - Question 9

Sodium and potassium are soft metals. So an ordinary knife and a little pressure is enough to cut them.

Important Questions: Materials: Metals And Non Metals - Question 10

What happens when Non-Metals react with water?

Important Questions: Materials: Metals And Non Metals - Question 11

The property of metals by which they can be beaten in to thin sheets is called-

Important Questions: Materials: Metals And Non Metals - Question 12

Non-metal can be converted into wires.

Detailed Solution for Important Questions: Materials: Metals And Non Metals - Question 12

Non- metals  are non - (malleable and ductile). They are very brittle, and cannot be rolled into wires or poundes into sheets.

Important Questions: Materials: Metals And Non Metals - Question 13

Bromine is only a liquid metal. 

Detailed Solution for Important Questions: Materials: Metals And Non Metals - Question 13

The correct option is B.
bromine is a fairly abundant element but has a rare property: it is the only nonmetal to exist in liquid form at room temperature, and one of only two elements (the other being mercury) that is liquid at room temperature and pressure.

Important Questions: Materials: Metals And Non Metals - Question 14

The property of beating metals into thin sheets is called malleability.

Important Questions: Materials: Metals And Non Metals - Question 15

 Metals produce basic oxide with oxygen.

Detailed Solution for Important Questions: Materials: Metals And Non Metals - Question 15

The correct option is A.
 Oxides of metals are actually basic in nature not alkaline. This can be explained as oxygen reacts with metal to form corresponding metal oxides which are basic in nature. Also these metal oxides react with acid to form salt and water this shows that they are basic in nature.

Important Questions: Materials: Metals And Non Metals - Question 16

Metals are solid except mercury.

Important Questions: Materials: Metals And Non Metals - Question 17

Non‑metals are found in all the three states like solid, liquid, gas.

Detailed Solution for Important Questions: Materials: Metals And Non Metals - Question 17

True, because there are some non metals that are found in solid, liquid and gas. diamond is found in solid state form, bromine found in liquid state form and helium and oxygen are found in gas state.

Important Questions: Materials: Metals And Non Metals - Question 18

Sodium and potassium are kept in water.

Detailed Solution for Important Questions: Materials: Metals And Non Metals - Question 18

Sodium and potassium metals reacts very vigorously with water ; this reaction gives out so much heat that the hydrogen evolved catches fire. Therefore, these metals are stored under kerosene .
So, the given statement is false.

Important Questions: Materials: Metals And Non Metals - Question 19

Sodium is such a hard metal that it cannot be cut with a knife.

Detailed Solution for Important Questions: Materials: Metals And Non Metals - Question 19

Sodium is a soft metal that can be cut easily with a table knife. It is not a hard metal. Freshly cut sodium metal has a bright, shiny surface that quickly becomes a dull gray as it reacts with oxygen in the air around it.
So, the given statement is false.

Important Questions: Materials: Metals And Non Metals - Question 20

Chlorine is a very reactive metal.

Detailed Solution for Important Questions: Materials: Metals And Non Metals - Question 20

The chlorine is a very reactive now metal. All noble gases are considered as non - metals.
So, the given statement that chlorine is a very reactive metal, is false.

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