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Materials Metal...

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  • Question 1
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     Read the following statements carefully and identify X, Y and Z respectively.

    (i)  X is stored under kerosene.

    (ii) Y catches fire on exposure and stored in water.

    (iii) Z reacts with steam.

  • Question 2
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     Read the given statements and select the correct option.

    Statement 1: Silver objects become green and lose their shine with the passage of time.

    Statement 2: Silver reacts with carbon dioxide and moisture present in the atmosphere.

  • Question 3
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    Mr. Ramakant, a science teacher organised a quiz in the class. He stated few applications of non-metals and asked students to guess the names of the non-metals. Mark the correct option.

  • Question 4
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    Read the given passage and fill in the blanks by choosing an appropriate option.

    Non-metals find wide applications in industries. For example ___i___ is used in electrodes, ___ii___ is used in welding metals, ___iii___ is used to make antiseptic creams while ___iv___ is used as a preservative due to its inert nature.

  • Question 5
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    Fill in the blanks with the most appropriate option.

    'W' is very reactive metal, reacts vigorously with oxygen and water therefore, stored in ___(1)___.

    'X' is non-metal, soft and dull and forms ___(2)___ oxides with oxygen.

    'Y' is very reactive ___(3)___, catches fire if exposed to air, therefore, stored in water.

    'Z' does not react with dilute hydrochloric acid even on heating but it reacts with sulphuric acid. When it is exposed to moist air for long, it acquires a dull ___(4)___    coating.

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