There are a finite amount of components that can combine to generate the limitless variety of substances that exist in the cosmos. There are just 94 naturally occurring elements in all. Metal and non-metal distinctions are a crucial part of the classification of elements. Metals comprise most of the elements. The remaining substances are either metalloids or non-metals. Metalloids have both metallic and nonmetallic characteristics.
Download Class 8 Chemistry Worksheet on Chapter 4 Materials: Metals and Non-Metals Set 3 PDF
CBSE Class 8 Chemistry Chapter 4 Materials: Metals and Non Metals– Set 3
Q-1: Which of the following metals does not show a reaction with hot water or steam?
a) Fe
b) Al
c) Pb
d) Zn
Q-2: Why are non metals bad conductors of heat and electricity?
Q-3: Why is tungsten used to make incandescent lamp filaments?
Q-4: Which of the following metals doesn’t react with acids?
a) Iron
b) Lead
c) Silver
d) Aluminium
Q-5: Give two examples of each of the metals that are good and bad conductors of heat.
Q-6: Which of the following non-metal is lustrous?
a) Sulphur
b) Bromine
c) Fluorine
d) Iodine
Q-7: Which of the following non metal is hard?
a) Carbon
b) Graphite
c) Boron
d) Phosphorous
Q-8: Which of the following is untrue regarding the metal magnesium?
a) It burns in O2 with a dazzling white flame.
b) It reacts with cold H2O to form MgO and evolves hydrogen gas.
c) It reacts with water to form magnesium hydroxide and evolves hydrogen gas.
d) It reacts with steam to form magnesium hydroxide.
Q-9: Oxygen and metal M react to generate metal oxide, MO. This oxide forms a basic carbonate when it combines with moisture and atmospheric carbon dioxide. Determine metal M and write the reaction involved.
Q-10: Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals(except Mn and Mg)?
a) HCl
b) HNO3
c) H2SO4
d) None of the above
Q-11: Identify the following:
a) A metal present in calamine ore.
b) Metals present in solder.
c) An explosive made of a non-metal nitrogen compound.
d) A non- metal which is present in hair.
e) A metal used for making high-grade steel.
Q-12: Give the reasons for the following:
a) Aluminium foils are used for wrapping cigarettes.
b) Despite the fact that silver is the best heat conductor, copper and aluminium are typically used to make cooking utensils and water boilers.
c) Metals have high density.
Q-13: Match the following:
| Column I | Column II |
|---|---|
| A) Basic Oxide | i) ZnO |
| B) Acidic Oxide | ii) CuO |
| C) Fe + CuSO4 | iii) NO2 |
| D) Cu + AgNO3 | iv) From blue to green |
| E) Neutral Oxide | v) From colourless to blue
vi) NO vii) From green to blue |
Q-14: A and B react to form the compound Y. A is a metal, while B is a non metal.What can you say about compound Y’s melting point?
Q-15: Non-metals are often poor conductors of electricity. Which of the following non-metals is the best conductor?
a) Diamond
b) Gas carbon
c) Boron
d) Oxygen
Q-16: Metallic oxides are ________.
a) Polar covalent compounds
b) Ionic compounds
c) Covalent compounds
d) All of the above
Q-17: Cold water reacts with a metal M to produce a base X with the molecular formula MOH (molecular mass = 56 u) and a gas Y that ignites with a pop sound. Identify the M, X, and Y and also write the reaction involved.
Q-18: Metals have a sonorous nature. What does it mean?
Q-19: Hydrochloric acid was added over a metal salt taken in a test tube. Effervescence was observed. The salt used is _______.
a) Calcium Nitrate
b) Calcium Chloride
c) Calcium Phosphate
d) Calcium Carbonate
Q-20: A gas that is used in the hydrogenation of oil is created when magnesium metal is treated with a diluted solution of a strong acid.
a) Identify the gas that developed.
b) Write the reaction’s word equation.
c) Give a test to find the gas that has evolved.
Download the PDF to access answers to the Chemistry Worksheet for Class 8 Chemistry Chapter 4 Materials: Metals and Non-Metals Set -3
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Read Also:
- Difference between Metals and Non metals
- Non Metals
- Properties of Metals and Non metals
- Chemical Properties of Metals
- Class 8 Materials Metals and Non-Metals Important Questions with Answers
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