Based on their increasing atomic numbers, all elements found on Earth have been appropriately ordered in a periodic table. There are 118 known elements, 92 of which are naturally derived and the remaining 26 are synthesised in laboratories. Based on their physical and chemical properties, these elements are divided into three groups: metalloids, metals, and non-metals.
Metals are hard elements that have a strong metallic bond between their atoms. In contrast, nonmetals are frequently brittle components. Metals have one, two, or three electrons in their valence shell. Non-metals are elements with 4, 5, 6, or 7electrons in their outermost shell.
Download PDF of Class 10 Chemistry Worksheet Chapter 3 Metals and Non-metals – Set 2
CBSE Class 10 Chemistry Worksheet Chapter 3 Metals and Non-metals – Set 2
Q1. Which of the following alloys contains mercury as one of the constituents?
a.) stainless steel
b.) solder
c.) duralium
d.) zinc amalgam
Q2. A basic oxide will be formed by which of the following element?
a.) K
b.) S
c.) P
d.) Kr
Q3. Which of the following metal exists in liquid state?
a.) Na
b.) Ag
c.) Cr
d.) Hg
Q4. Which of the following is the most reactive metal?
a.) Aluminium
b.) Copper
c.) Tin
d.) Calcium
Q5. Which of the following is not a property of a metal?
a.) Malleable
b.) Ductile
c.) Non-lustrous
d.) Conductor
Q6. Define the activity series of metals.
Q7. What are amphoteric oxides? Give two examples of amphoteric oxides.
Q8. An element X is soft and can be cut with a knife easily. This is very reactive with air and cannit be kept open with air, it reacts vigorously with water. Name the element X.
Q9. Fill in the blanks.
a.) Metals can form positive ions by ___.
b.) Electrical wires have a coating of an insulating material ___.
c.) The liquid non-metal is ____.
Q10. a.) Explain why metals usually do not liberate hydrogen gas with dilute nitric acid.
b.) Name two metals which can however liberate hydrogen gas on reacting with dilute nitric acid.
Q11. How does the method used for extracting a metal from its ore depend on the metal’s position in the reactivity series? Explain with examples.
Q12. Explain any three methods used for preventing corrosion of metals.
Q13. A solution of CuSO4 is kept in an iron pot. After a few days the iron pot was found to have a number of holes in it. Explain the reason in terms of reactivity. Write the equation of the reaction involved.
Q14. Give the steps involved in the extraction of metals of low and medium reactivity from their respective sulphide ores.
Q15. a.) Silver and copper lose their shine when they are exposed to air. Name the substance formed on their surface in each case.
b.) Tarnished copper vessels are cleaned with tamarind juice.
c.) Aluminium is more reactive than iron yet there is less corrosion of aluminium as compared to iron when both are exposed to air.
Q16. Write one example of each of the following:
a.) The most malleable metal and most ductile metal.
b.) The best conductor of heat and the poorest conductor of heat.
c.) A metal with the highest melting point and metal with the lowest melting point.
Q17. The atomic numbers of elements A, B and C are 11, 17 and 6 respectively.
a.) Which of these elements is a metal that forms a mono-positive ion?
b.) Which of the two elements combine through ionic valency.
c.) What is the formula of the compounds C and B.
Q18. a.) When calcium metal is added to water, the gas evolved does not catch fire but the gas evolved on adding potassium metal to water catches fire. Explain why?
b.) Name a metal for each case:
i.) It displaces hydrogen gas from tantric acid.
ii.) It does not react with any physical state of water.
iii.) It does not react with cold as well as hot water but reacts with steam.
Q19. Give reasons:
a.) Carbon cannot reduce the oxides of Na or Mg.
b.) NaCl is not a conductor of electricity in a solid state.
c.) Metals like Na, K, Ca and Mg are never found in their free state in nature.
d.) Iron articles are galvanized.
Q20. Answer the following:
a.) What is an alloy? How is an alloy made?
b.) What elements are present in steel? How are the properties of steel different from those of pure iron?
c.) Give the constituents and one use of brass.
d.) Name an alloy of copper. State its chemical composition and one use.
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