Options:
- A. HCHO
- B. C6H5CHO
- C. Cl3CCHO
- D. CH3COCH3
View Answer
D. CH3COCH3
Chemistry
Alkali and alkaline earth metals impart colours when heated over burner. It is due to______________?
Options:
- A. Smaller electronegativity of alkali metals
- B. Smaller ionic radius of these metals
- C. De-excitation of electrons from higher energy levels to low energy level
- D. Excitation of electrons from low energy levels to higher energy levels
View Answer
C. De-excitation of electrons from higher energy levels to low energy level
Gypsum is applied to the soil as a source of________________?
Options:
- A. Ca and P
- B. S and P
- C. Ca and S
- D. we could not apply
View Answer
C. Ca and S
Reacting bromine with benzene in the presence of sunlight will result in_______________?
Options:
- A. The rupturing of benzene ring
- B. Substitution reaction
- C. Addition reaction
- D. No-reaction
View Answer
C. Addition reaction
An element has electronic conviguration 1s2 2s2 2p2. It belongs to__________________?
Options:
- A. Group II-A
- B. Group IV-A
- C. Group VII-A
- D. Group VI-A
View Answer
B. Group IV-A
The longest period in the modern periodic table is___________________?
Options:
- A. 6th
- B. 7th
- C. 2nd and 3rd both
- D. 5th
View Answer
A. 6th
Keeping in view the size of atom which order is correct one ?
Options:
- A. Mg > Sr
- B. Ba > Mg
- C. Lu > Ce
- D. C1 > I
View Answer
B. Ba > Mg
Which of the following is an unsaturated carboxylic acid___________________?
Options:
- A. malonic acid
- B. oxalic acid
- C. succinic acid
- D. maleic acid
View Answer
D. maleic acid
Which of the following reaction is not shown by ketones ?
Options:
- A. reaction with HCN
- B. reaction with NaHSO3
- C. reaction with 2 4 dinitrophenyl hydrazine
- D. reaction with Fehling solution
View Answer
D. reaction with Fehling solution
Cannizaros reaction takes place through the transfer of ____________________ from complex anion?
Options:
- A. hydrogen ion
- B. hydride ion
- C. oxide ion
- D. methoxide ion
View Answer
B. hydride ion