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The p-Block Elements Test - 43

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The p-Block Elements Test - 43
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  • Question 1
    1 / -0
    The allotrope of this element is the primary absorber of UV solar radiation in Earth's atmosphere. The element is:
    Solution
    Allotrope of oxygen which is known as ozone, is the primary absorber of UV radiation in arth's atmosphere.
  • Question 2
    1 / -0
    What is found in sulphide ores?
    Solution
    Generally, Bismuth is found in Sulphide ore. The ore is called Bismotninite (Bi2S3)(Bi_2S_3)
    Antimony also occurs with sulphide in nature. eg. Stibnite (Cb2S3)(Cb_2S_3). But it is a mineral, not an ore.
    Similarly, Arsenic also occurs with sulphide in nature eg. Arsenic Sulfide (AS2S3)(AS_2S_3) But it is a mineral.
    Phosphorous generally occurs as oxide.In iron ores 
    eg- Phosphate (PO4 3)\left( { PO }_{ 4 }^{  3- } \right)
  • Question 3
    1 / -0
    II. The ideal gas law can be applied to a sample of xenon at a temperature of 273oC-{273}^{o}C.
    IIII. Xenon is a noble gas.
    Solution
    Since, 273°C = 0 K-273°C\ =\ 0\ K.
    At absolute zero temperature i.e. 0 K, a gas will no longer be a gas, but rather it becomes a solid. So, the gas law will not be applicable in this case.
    So, correct answer is option CC.
  • Question 4
    1 / -0
    Statement 1: By mass, oxygen is the most abundant element in the human body.
    Statement 2: It is principally found as O2O_2 in the bloodstream.
    Solution

    By mass, oxygen is the most abundant element in the human body.

    Oxygen is found in the human body as oxy-haemoglobin in the bloodstream but not as O2O_2

    So statement 1 is correct but not 2.
    Hence option C is correct.
  • Question 5
    1 / -0
    Regardless of its electron configuration, the given element must always be paramagnetic when it's a single, neutrally charged atom.
  • Question 6
    1 / -0
    Which metal is in ores such as orpiment, realgar etc?
    Solution
    Realgar is represented by AS4S4AS_4S_4 (red colour)
    Orpiment is represented by AS2S3AS_2S_3 (yellow-orange colour)
    These both are the Sulfide minerals of Arsenic.
    Hence arsenic is correct.
  • Question 7
    1 / -0
    In which of the following choices are the noble gases arranged correctly in order of increasing boiling point?
    Solution
    The boiling point of noble gases increases with increase in atomic size. Only weak London dispersion forces and weak van der Waals forces exist between the atoms of noble gases. The magnitude of these forces increases with an increase in the size of the atom. Thus, as the forces increase, more heat energy will be required to overcome these forces. Higher the atomic size, higher will be the boiling point.
  • Question 8
    1 / -0
    What occurs in the minerals of the apatite family?
    Solution
    Apatite is the group of phosphate ion. phosphorous occurs in minerals of the apatite family.Hence,A is correct option.\text {Apatite is the group of phosphate ion. }\\\text {phosphorous occurs in minerals of the apatite family.Hence,A is correct option.}
  • Question 9
    1 / -0
    Which selection is the correct formula for the chlorate ion?
    Solution
    The correct formula for the chlorate ion is ClO3Cl{O}_{3}^{-}
    The formula ClOCl{O}^{-} represents hypochlorite ion.
    The formula ClO2Cl{O}_{2}^{-} represents chlorite ion.
    The formula ClO4Cl{O}_{4}^{-} represents perchlorate ion.
  • Question 10
    1 / -0
    The atomic number of some elements are as given. Which of the following elements belong to the nitrogen family?
    Solution
    Atomic number 33 belongs to arsenic AsAs. Atomic number 51 belongs to Antimony SbSb. Atomic number 83 belongs to Bismuth BiBi. All of them belongs to nitrogen family.

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