CBSE Class 10 Science Metals and Non Metals MCQs Set C

Question. An example of a metal which is a liquid at room temperature
a) Zinc
b) Copper
c) Mercury
d) Bromine

Answer : C

Question. Gold is used in making ornaments because it is:
a) Lusturous
b) Unreactive
c) Malleable
d) All of the above

Answer : D

Question3. You are given two statements a and b, select the correct inference from this:
a) Metals conduct heat.
b) Diamond is the best conductor of heat.

i. Hence diamond is a metal

ii. Statement a is correct

iii. Statements a and b is correct

iv. None of the above

Answer : B

Question. A list of metals arranged in the order of their decreasing activities is known as:
a) Periodic table
b) Reactivity series
c) Newland’s law of octaves
d) All of these

Answer : B

Question. Sodium is kept immersed in kerosene oil because:
a) It reacts with moisture in the air
b) Immersing in kerosene cuts off the supply of air
c) The reaction of sodium with air is very violent.
d) All of the above.

Answer : D

Question. Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows
a) Which is the least reactive metal?
i. A ii. B iii. C iv. D

Question. In the above table arrange the metals A, B, C and D in increasing order of reactivity:
a) D < A < C < B
b) D < C < B
c) D < C < A < B
d) C < D < A < B

Answer : B

Question. What are the ions present in Na₂O?
a) Na⁺, O
b) Na²⁺, O^2-
c) Na²⁺, O
d) Na⁺, O^2-

Answer : D

Question. Among the following select the metal found free in nature:
a) Au
b) Cu
c) Na
d) Mg

Answer : A

Question. Ores mined from the earth are usually comtaminated with large amounts of impurities such as soil, sand, etc called_____________.
a) Gravel
b) Gangue
c) Sand
d) Granite

Answer : B

Question. Which of the following can undergo a chemical reaction ? 
(a) MgSO₄ + Fe
(b) ZnSO₄ + Fe
(c) MgSO₄ + Pb
(d) CuSO₄ + Fe

Answer : D

Very Short Answer type Questions :

Question. Which metal does not react with water at all? 
Answer: Copper because it is less reactive than hydrogen.

Question. Arrange the following metals in the decreasing order of reactivity:
Na, K, Cu, Ag
Answer: K > Na > Cu > Ag

Question. Metals generally occur in solid state. Name and write symbol of a metal that exists in liquid state at room temperature.
Answer: Mercury(Hg) exists in liquid state at room temperature.

Question. Name two metals that are soft and can be cut with knife.
Answer: Na (Sodium) and K (Potassium)

Question. Which of the following two metals will melt at body temperature (37 °C)? Gallium, Magnesium, Caesium, Aluminium
Answer: Gallium and Caesium

Question. How many valence electrons do metals have?
Answer: They have 1 to 3 valence electrons.

Question. Why do we use copper and aluminium wire for transmission of electric current? 
Answer: It is because copper and A1 are good conductor of electricity and ductile, i.e. drawn into wires easily.

Question. Name one metal and one non-metal in liquid state at room temperature.
Answer: Mercury is a liquid metal and bromine is liquid non-metal.

Question. Name the ion made by non-metals: Cations/anion. 
Answer: Anions (negative ions) because non-metals can gain electrons easily.

Question. What are metal?
Answer: Those elements which can lose electrons easily and form positive ions. They are mostly solids, possess high density.

Question. Why does calcium float in water? 
Answer: It is because hydrogen gas is formed which sticks to surface of calcium, therefore it floats.

Question. Name any one metal which reacts neither with cold water nor with hot water, but reacts with heated steam to produce hydrogen gas.
Answer: Iron; 3Fe(s) + 4H₂O(g) → Fe₃O₄(s) + 4H₂(g)

Question. A non-metal X exists in two different forms Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y and Z.
Answer: ‘X’ is carbon, ‘Y’ is diamond as it is the hardest natural substance and ‘Z’ is graphite as it is good conductor of electricity.

Question. From amongst the metals sodium, calcium, aluminium, copper and magnesium, name the metal
(a) which reacts with water only on boiling, and
(b) another which does not react even with steam.
Answer: (a) Magnesium reacts with water only on boiling.
(b) Copper does not react even with steam.

Question. What are non-metals?
Answer: Those elements which can gain electrons easily.

Short Answer type Questions :

Question. A non-metal which is a conductor of electricity.
Answer: Graphite

Question. Give examples of metals which can be cut with a knife.
Answer: Lithium, sodium, potassium

Question. Name two metals which are comparatively poor conductors of heat.
Answer: Le ad and mercury

Question. Name the metals that do not react with water
Answer: Lead, copper, silver and gold

Question. Name the metals which produce amphoteric oxides.
Answer: A luminium oxide, Zinc oxide

Question. Write the chemical reaction when iron reacts with dilute H₂S0₄
Answer: Fe + H2S04 ---→ FeS04 +H2

Question. Name a metal and a non-metal which is a liquid at room temperature.
Answer: Metal - Mercury, Non-metal - Bromine

Question. Name the metals which react with cold water, hot water and steam.
Answer: Metals with cold water – sodium, potassium and calcium
Metals with hot water – magnesium
Steam – aluminium, iron and zinc

Question. Name the compound formed when copper is heated in air.
Answer: Copper (11) oxide

Question. Name two metals that will melt when kept on your palm.
Answer: Gallium, Caesium

Question. Why metals like sodium and potassium are immersed in kerosene oil?
Answer: Metals like sodium and potassium react so vigorously that they catch fire, if kept i8n the open. To protect them and to prevent accidental fires ,they are immersed in kerosene oil

Question. Write the chemical equation for the reaction between Aluminium oxide and acid.
Answer: Al2O3+6 HCl ---→ 2 AlCl3 +3H2O

Question. Name a strong oxidizing agent which produces water on reactivity with most metals.
Answer: Nitric acid (HN03)

Question. What kind of oxide is produced when metals and non-metals are dissolved in water?
Answer: Metals form basic oxide and amphoteric oxide, non-metals form acidic oxides and neutral oxides

Question. Why does calcium or magnesium float when they react with water?
Answer: Calcium or magnesium react less violently with water and the heat produced is not sufficient for the evolved hydrogen to catch fire

Question. What is the property of metals in their pure state having a shining surface called?
Answer: M etallic lustre

Question. Which metals does not react with at even high temperature.
Answer: Silver, gold

Question. Write the chemical equation for the reaction of potassium metal with water.
Answer: 2K +H2O ---→ 2KOH+H2+ heat

Question. Copper does not burn on heating, but it gets a coating of black coloured layer. Name the coating
Answer: Copper II oxide

Question. Write the chemical equation for the reaction of sodium metal with water.
Answer: 2Na+H2O ---→ 2NaOH+H2+ heat

Question. Name the property of metals that can be beaten into thin sheets.
Answer: Malleability

Question. Name the most malleable metals.
Answer: Gold, silver, platinum

Question. Write the chemical equation for magnesium and calcium reacting with water
Answer: Mg + 2H2O ---→Mg (OH) 2+ H2
Ca + 2H20 ---→Ca (OH) 2 + H2

Question. Aluminium oxide reacts with base to form sodium aluminate and water. Write chemical equation for this reaction.
Answer: Al2O3+2NaOH ---→2 NaAlO2 + H2O

Question. Why are metals said to be sonorous?
Answer: The property of metals producing a sound on striking a hard surface is called to be sonorous

Question. Name the metals whose surface get covered by thin layer of oxide on oxidation at ordinary temperature
Answer: Magnesium, aluminium, zinc, lead

Question. A metal does not burn on heating but its filings burn vigorously when sprinkled in the flame of the burner
Answer: iron

Question. Name the only metal which produces H2 on reacting with nitric acid?
Answer: Manganese, magnesium

Question. Complete the following:
Metal A + salt solution of B = __________ + __________
Answer: Salt solution of A + Metal B

Question. Name the property of metals that can be drawn into thin wires.
Answer: Ductility

Question : An example of a metal which is a liquid at room temperature