The p-Block Elements - Online Test
Q1. Which among the following does not exhibit positive oxidation state?
Answer : Option D
Explaination / Solution:
Fluorine is most electronegative element, it shows only -1 oxidation state.
Q2. Fluorine reacts with H2S to produce
Answer : Option C
Explaination / Solution:
3F2+ H2S→SF4+ 2HF
Q3. Which of the following is the strongest Lewis base?
Answer : Option A
Explaination / Solution:
Because of lower electronegativity of I
Q4. Which of the following is an amphoteric oxide?
Answer : Option A
Explaination / Solution:
Higher oxidation state oxides are acidic while lower oxidation state oxides are basic. Intermediate oxidation state oxides are amphroteric.
Q5. Which gas has a smell of rotten fish?
Answer : Option C
Explaination / Solution:
Phosphine has smell like rotten fish.
Q6. Which of the following turns lead acetate paper black?
Answer : Option D
Explaination / Solution:
Pb2++S2−→PbS(black)
Q7. Which gas is evolved when urea is treated with NaOH?
Answer : Option A
Explaination / Solution:
Urea on reaction with NaOH liberates ammonia.
Q8. Ozone reacts with KOH solution to form
Answer : Option A
Explaination / Solution:
O3 reacts with KOH to form KO3
Q9. Hydrogen sulphide reacts with lead acetate forming a black compound which reacts with hydrogen peroxide to form another compound. The colour of the compound is
Answer : Option C
Explaination / Solution:
Q10. Which of the following is thermally the most stable?
Answer : Option D
Explaination / Solution:
Stability of hydrides decreases down the group so most stable is H2O
