St. Britto Hr. Sec. School - Madurai
12th Chemistry weekly Test - 1 ( p-Block Elements-I )-Aug 2020
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The compound that is used in nuclear reactors as protective shields and control rods is
Metal borides
metal oxides
Metal carbonates d) metal carbide
none of these
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Graphite has
2-d sheet structure
Vander waals force between successive layers of carbon sheets
Sp2 hybridised carbon linked with other three carbon atoms in hexagonal planar structure
all the above
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Elements of group 13 mainly form covalent compounds because ______
small size
electro negativity values are high
ionization energy is very high
both (a) and (c)
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Allotropy is due to ______
difference in chemical properties
difference in the number of atoms in the molecules
difference in the arrangement of atoms in the molecules in the crystal
None of these
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Among group 14 elements, name
(i) the most electro negative element
(ii) the most metallic element -
How is boric acid extracted from borax?
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Give the uses of alum.
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What is phosgene? How is it prepared?
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Boron does not react directly with hydrogen. Suggest one method to prepare diborane from BF3.
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Which one is more soluble in diethyl ether, anhydrous Alcl3 or hydrated Alcl3? Explain in terms of bonding.
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Find out the oxidation state of carbon in each of the following:
(i) CaC2
(ii) H2CO3
(iii) HCN
(iv) CO -
Describe the structure of diborane
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How is aluminum chloride prepared from aluminum?
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Give one example for each of the following
(i) icosogens
(ii) tetragen
(iii) prictogen
(iv) chalcogen -
Give 3 uses of aluminium chloride
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How is CO2 manufactured?
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How will you identify borate radical?
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A hydride of 2nd period alkali metal (A) on reaction with compound of Boron (B) to give a reducing agent (C). identify A , B and C.
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How are silicates classified? Give an example for each type of silicate.
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What are the various methods by which carbon-di-oxide is prepared?
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