THE P-BLOCK ELEMENTS Quiz-15

The P-Block Quiz-15

Dear Readers,

IIT JEE exam which consists of JEE Main and JEE Advanced is one of the most important entrance exams for engineering aspirants. The exam is held for candidates who are aspiring to pursue a career in the field of engineering and technical studies. 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. Electron affinity is positive, when

•  O changes into O^-
•  O^- changes into O^2-
•  O changes into O⁺
•  Electron affinity is always negative

Solution

O^- changes into O^2-

Q2.Which of the following can be used as dehydrating agents?

•  Conc. H₂SO₄
•  POCl₃
•  P₂O₅
•  All of these

Solution
All of these

Q3.  Which of the following statements are correct for all three halogens (X),Cl,Br and I?

•  They all need to gain one electron to acquire stable configuration
•  They all form strong acid of the type HX
•  Both (a) and (b) are correct
•  None of the above is correct

Solution
Both (a) and (b) are correct

Q4. Which is thermocromic?

•  S₄N₄
•  B₃N₃H₆
•  S₈
•  None of these

Solution
S₄N₄

Q5.Which of the following has peroxy linkage?

•  H₂S₂O₃
•  H₂SO₅
•  H₂S₂O₇
•  H₂S₄O₆

Solution
H₂SO₅

Q6. Neon lamps are used in botanical gardens and in green houses as they

• Provides Oxygen
• Provides better light
• Stimulate growth of plants
• None of the above

Solution
Stimulate growth of plants

Q7. Aqueous solutions of hydrogen sulphide and sulphur dioxide when mixed together yield

•  Sulphur trioxide and water
•  Sulphur and sulphuric acid
•  Sulphur and water
•  Hydrogen preroxide and sulphur

Solution
Sulphur and water

Q8.The correct order of O-O bond length in O₂, H₂O₂, and O₃ is

•  H₂O₂ > O₃ > O₂
•  O₂ > H₂O₂ > O₃
•  O₃ > H₂O₂ > O₂
•  O₂ > O₃ > H₂O₂

Solution
H₂SO₄ H₂O₂ > O₃ > O₂

Q9.When an article is bleached by SO₂ it loses its colour. The colour can be restored by

•  Exposure to air
•  Heating
•  Dilution
•  None of these

Solution
Exposure to air

Q10. Acid strength of oxoacids of halogen is in order

•  HOF > HOCl > HOBr > HOI
•  HOI > HOBr > HOCl > HOF
•  HOI > HOCl > HOBr > HOF
• HOCl > HOBr > HOI > HOF

Solution
HOI > HOBr > HOCl > HOF