A bubble of air is underwater at temperature 15°C and the pressure 1.5 bar. If the bubble rises to the surface where the temperature is 25°C and the pressure is 1.0 bar, what will happen to the volume of the bubble?
Volume will become greater by a factor of 1.6
Volume will become greater by a factor of 1.1
Volume will become smaller by a factor of 0.70
Volume will become greater by a factor of 2.9
The pairs of species of oxygen and their magnetic behaviours are noted below. Which of the following presents the correct description?
- Both diamagnetic
- Both diamagnetic
- Both diamagnetic
- Both diamagnetic
Some statements about heavy water are given below.
(i) Heavy water is used as moderator in nuclear reactors.
(ii) Heavy water is more associated than ordinary water.
(iii) Heavy water is more effective solvent than ordinary water.
Which of the above statements are correct?
(i) and (ii)
(i), (ii) and (iii)
(ii) and (iii)
(i) and (iii)
A.
(i) and (ii)
Heavy water is used as a moderator in nuclear reactors. Its boiling point is higher as compared to the ordinary water. Thus, it is more associated as compared to ordinary water. The dielectric constant is however higher for H2O, thus,H2O is a more effective solvent than heavy water (D2O).
The IUPAC name of the compound is
pent-4-yn-2-ene
pent-3-en-1-yne
pent-2-en-4-yne
pent-1-yn-3-ene
Match List I with List II for the compositions of substances and select the correct answer using the codes given below the lists.
List I (Substance) | ListII (Composition) | ||
A. | Plaster of Paris | 1. | |
B. | Epsomite | 2. | |
C. | Kieserite | 3. | |
D. | Gypsum | 4. | |
5. |
A B C D
3 4 1 2
A B C D
2 3 4 1
A B C D
1 2 3 5
A B C D
4 3 2 1
Consider the reactions,
The mechanisms of reactions (i) and (ii) are respectively
SN 1 and SN2
SN 1 and SN1
SN 2 and SN 2
SN 2 and SN1