Top Chemistry MCQS
All Questions for: Top Chemistry MCQS
Question 751: If R is the Rydberg constant for hydrogen, then wave-number of the second line in the Lyman series is _________?
- A R/4
- B R/2
- C 3R/4
- D 2 R
Explanation: The correct answer to the question is: 3R/4
Question 752: Which one of the following alkali metals forms only normal oxide when it reacts with O2 ?
- A Lithium
- B Rubidium
- C Potassium
- D Sodium
Explanation: The correct answer to the question is: Lithium
Question 753: Which of the following is most soluble on water?
- A BaSO4
- B CaSO4
- C SrSO4
- D MgSO4
Explanation: The correct answer to the question is: MgSO4
Question 754: Benzene is heated in air with V2O5 at 450°C it undergoes________________?
- A Addition reaction
- B Substitution reaction
- C Elimination reaction
- D Oxidation reaction
Explanation: The correct answer to the question is: Oxidation reaction
Question 755: First ionization potential of alkaline earth metal is greater than alkali metals because___________________?
- A All
- B They have smaller atomic sizes
- C They have greater atomic radii
- D They are more reactive
Explanation: The correct answer to the question is: They have smaller atomic sizes
Question 756: Hydrogen bonding is present in __________?
- A All of these
- B Ethyl Alcohol
- C Water
- D Phenol
Explanation: The correct answer to the question is: All of these
Question 757: Chlorine Cl when attached to benzene has________?
- A +I and +R effect
- B +1 and -R effect
- C -1 and +R effect
- D -I and -R effect
Explanation: The correct answer to the question is: -1 and +R effect
Question 758: Compound containing two halogen atoms on two adjacent carbon atoms are called as ___________?
- A Vicinal dihalides
- B Diols
- C Glycols
- D Geminal dihalides
Explanation: The correct answer to the question is: Vicinal dihalides
Question 759: The colour of chlorine gas is_______________?
- A grayish black
- B reddish brown
- C pale yellow
- D freenish yellow
Explanation: The correct answer to the question is: freenish yellow