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Maharashtra SSC (Class 10) Unit 4B1: Properties of Metals and Non-Metals — practice questions — page 2

Explore 43 free Unit 4B1: Properties of Metals and Non-Metals questions in Maharashtra SSC (Class 10) Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 4B1: Properties of Metals and Non-Metals questions and exercises with answers

Showing questions 31–43 of 43.

Less reactive metals like gold, silver and platinum are found in nature mainly in which state?Read the answer and worked solution →Which method is used to obtain pure metals from the impure metals got after reduction?Read the answer and worked solution →The reddish substance Fe2O3.H2O that deposits on iron exposed to moist air is known as what?Read the answer and worked solution →Why do silver articles turn blackish after long exposure to air?Read the answer and worked solution →The greenish layer that forms on a copper vessel kept in moist air is mainly which compound?Read the answer and worked solution →Why can a layer of paint not protect an iron article from rusting permanently?Read the answer and worked solution →In galvanizing, a thin layer of which metal is applied to protect iron or steel?Read the answer and worked solution →In galvanizing, why does the zinc layer corrode before the iron beneath it?Read the answer and worked solution →Depositing a layer of molten tin on a metal surface, popularly called 'kalhaee', is known as what?Read the answer and worked solution →In anodization of aluminium, the article is made the anode so that a protective layer of what forms?Read the answer and worked solution →In electroplating, what is coated onto a more reactive metal by electrolysis?Read the answer and worked solution →An alloy in which one of the constituent metals is mercury is given which special name?Read the answer and worked solution →Bronze, an alloy resistant to sun and rain, is made from which composition?Read the answer and worked solution →

Worked practice questions

Less reactive metals like gold, silver and platinum are found in nature mainly in which state?

  1. Combined nitrate state
  2. Combined sulphide state
  3. Combined carbonate state
  4. Free (native) state
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Correct answer: D. Free (native) state

1. Metals at the bottom of the reactivity series are least reactive. 2. Being unreactive, they do not readily combine with other elements. 3. Therefore gold, silver and platinum occur in the free (native) state. 4. Combined sulphide or carbonate states are typical of reactive metals, so those are wrong. _Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 8 "Metallurgy", p.114_

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Which method is used to obtain pure metals from the impure metals got after reduction?

  1. Electrolysis
  2. Roasting
  3. Calcination
  4. Leaching
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Correct answer: A. Electrolysis

1. Metals obtained by reduction still contain impurities. 2. These impurities must be removed to get pure metal, a step called refining. 3. The electrolysis (electrolytic) method is used for this refining. 4. Roasting and calcination are ore-treatment steps, not refining of the metal, so they are wrong. _Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 8 "Metallurgy", p.114_

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The reddish substance Fe2O3.H2O that deposits on iron exposed to moist air is known as what?

  1. Amalgam
  2. Patina
  3. Rust
  4. Gangue
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Correct answer: C. Rust

1. Iron reacts with moist air over time. 2. A reddish deposit of Fe2O3.H2O forms on its surface. 3. This substance is called rust, and the process is rusting. 4. Patina is the greenish layer on copper, not on iron, so that option is wrong. _Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 8 "Metallurgy", p.115_

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