THE P-BLOCK ELEMENTS-11th Quiz-16

CHEMISTRY THE P-BLOCK ELEMENTS-11th
QUIZ-16

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Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything..

Q1.Glass having higher refractive index is prepared using

• NiO
• CoO
• PbO
• CaO

Solution
PbO
Glass having higher refractive index is prepared using PbO and these are used in Thailand for centuries.

Q2.The incorrect statement is

•  Anhydrous AlCl₃ is a covalent substance
•  Ionic compounds generally have low melting point and boiling point
•  A molecule shows a more stable forms as compound to individual atom
•  CCl₄ is a non-polar solvent

Solution
Ionic compounds have high m.p. and high b.p.

Q3.Which of the following is not an acid anhydride?

•  CO₂
•  CO
•  SO₂
•  SO₃

Solution
H₂CO₃ : CO₂
H₂SO₃ : SO₂
H₂SO₂ : SO₃

Q4.Light elements B, Al, C and Si are

•  Oxophiles (high affinity for oxygen)
•  Fluorophiles (high affinity for fluorine)
•  Both type
•  None of the types given

Solution
Both type

Q5.Which is/are used as an anaesthetic?

•  N₂O
•  C₂H₄
•  CHCl₃
•  All of these

Solution
All of these

Q6.The element which forms oxides in all oxidation states +1 to +5 is

•  N
•  P
• As
•  Sb

Solution
N₂O  +1
NO    +2
N₂O₃ +3
NO₂   +4
N₂O₅ +5

Q7.The bond angle in AsH₃ is greater than that in

•  NH₃
•  H₂O
•  BCl₃
•  None of these

Solution
None of these

Q8.Select the correct statement(s)

•  Aluminium dissolves in dilute mineral acids but is made passive by concentrated nitric acid
•  Aluminium vessel can be used as storage of NaOH
•  Both (a) and (b)
•  None of the above

Solution
2Al + 6HCl → 2AlCl₃ + 3H₂
2Al + 3[O]HNO₃ → Al₂O₃
2Al + 2NaOH + 2H₂O →2NaAlO₂ + 3H₂

Q9.Dimer formation can take place with

•  BH₃
•  AlCl₃
•  NO₂
•  All of these

Solution
2BH₃ → B₂H₆
2AlCl₃ → Al₂Cl₆
2NO₂ → N₂O₂
BH₃, AlCl₃ and NO₂, are all electron-deficients, hence dimer formation takes place

Q10. S₃O₉ is a trimer of SO₃. Number of (S-S) bonds in S₃O₉ is

•  Three
•  Two
•  One
• Zero

Solution