Metals and Non Metals

Private: DME Science Study Material
About Lesson

Part: 1

Q1. The most abundant metal in the earth’s crust is
(a) Iron
(b) Aluminium
(c) Calcium
(d) Sodium

Answer: b

Q2. The poorest conductor of heat among metals is
(a) Lead
(b) Mercury
(c) Calcium
(d) Sodium
Answer: a

Q3. Which property of metals is used for making bells and strings of musical instruments like Sitar and Violin?
(a) Sonorousness
(b) Malleability
(c) Ductility
(d) Conductivity

Answer: a

Q4. Non-metals form covalent chlorides because
(a) they can give electrons to chlorine
(b) they can share electrons with chlorine
(c) they can give electrons to chlorine atoms to form chloride ions
(d) they cannot share electrons with chlorine atoms
Answer: b

Q5. The highly reactive metals like Sodium, Potas-sium, Magnesium, etc. are extracted by the
(a) electrolysis of their molten chloride
(b) electrolysis of their molten oxides
(c) reduction by aluminium
(d) reduction by carbon
Answer: a

Part: 2

Q1. The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called
(a) Roasting
(b) Reduction
(c) Calcination
(d) Smelting

Answer: c

Q2. Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper etc. are reduced by using
(a) Aluminium as reducing agent
(b) Sodium as reducing agent
(c) Carbon as reducing agent
(d) Calcium as reducing agent

Answer: c

Q3. An element X is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following
(a) Mg
(b) Na
(c) P
(d) Ca

Answer: b

Q4. Reaction between X and Y forms compound Z. X loses electron and Y gains electron. Which of the following properties is not shown by Z?
(a) Has high melting point
(b) Has low melting point
(c) Conducts electricity in molten state
(d) Occurs as solid

Answer: c
Explanation: Reason: Z is an ionic compound. It has a high melting point.

Q5. The electronic configurations of three ele¬ments X, Y and Z are X — 2, 8; Y — 2, 8, 7 and Z — 2, 8, 2. Which’of the following is correct?
(a) X is a metal
(b) Y is a metal
(c) Z is a non-metal
(d) Y is a non-metal and Z is a metal

Answer: c
Explanation: Reason: According to the electronic configuration, Y is Chlorine and Z is Magnesium.


Metals and Non Metals
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