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JEE Main Test 31

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JEE Main Test 31
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  • Question 1
    4 / -1

    According to the peridoic law of elements the variatiion in properties of elements is related to their

    Solution

    All physical and chemical properties of elements are perioidic function of atomic number. Modern periodic law. 
    Hence, option C is correct.

  • Question 2
    4 / -1

    The substance used in Holmes signals of the ship is a mixture of

    Solution

    In Holmes signals of the ship mixture of CaC2 and Ca3P2 is used. A mixture of calcium carbide and calcium phosphide placed in a container which reacts with water to produce gases (PH3 and C2H2).

    Phosphine gets ignited spontaneously as it comes in contact with air and also ignites acetylene. Thus a bright red flame is produced which is accompanied by huge smoke due to the burning of phosphine. This serves as a signal to the approaching ships.

    Hence, option A is correct.

  • Question 3
    4 / -1

    The pair in which phosphorous atoms have a formal oxidation state of +3 is

    Solution

    Orthophosphorous acid H3PO3 
    and pyrophosphorous acids H4P2O5 
    Hence option C is correct.

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