In a meter bridge experiment, the null point is at a distance of \(30~\text{cm}\) from \(\mathrm{A}\). If a resistance of \(16~\Omega\) is connected in parallel with resistance \(Y\), the null point occurs at \(50~\text{cm}\) from \(\mathrm{A}\). The value of the resistance \(Y\) is:
1. | \(\dfrac{112}{3}~\Omega\) | 2. | \(\dfrac{40}{3}~\Omega\) |
3. | \(\dfrac{64}{3}~\Omega\) | 4. | \(\dfrac{48}{3}~\Omega\) |
The temperature at which the rms speed of atoms in neon gas is equal to the rms speed of hydrogen molecules at \(15^{\circ} \mathrm{C}\) is: (Atomic mass of neon \(=20.2\) u, molecular mass of hydrogen \(=2\) u)
1. | \(2.9\times10^{3}\) K | 2. | \(2.9\) K |
3. | \(0.15\times10^{3}\) K | 4. | \(0.29\times10^{3}\) K |
Two planets are in a circular orbit of radius \(R\) and \(4R\) about a star. At a specific time, the two planets and the star are in a straight line. If the period of the closest planet is \(T,\) then the star and planets will again be in a straight line after a minimum time:
The correct order for boiling points of the following compounds is:
1. | AsH3 > PH3 > NH3 > SbH3 > BiH3 |
2. | BiH3 > SbH3 > NH3 > AsH3 > PH3 |
3. | NH3 > PH3 > AsH3 > SbH3 > BiH3 |
4. | PH3 > NH3 > AsH3 > SbH3 > BiH3 |
Match List-I with List-II:
List-I | List-II | ||
(a) | 4.48 litres of O2 at STP | (i) | 0.2 moles |
(b) | 12.022 × 1022 molecules of H2O | (ii) | 12.044 × 1023 molecules |
(c) | 96 g of O2 | (iii) | 6.4 g |
(d) | 88 g of CO2 | (iv) | 67.2 litres at STP |
(a) | (b) | (c) | (d) | |
1. | (i) | (iii) | (iv) | (ii) |
2. | (iii) | (i) | (iv) | (ii) |
3. | (iv) | (i) | (ii) | (iii) |
4. | (iii) | (i) | (ii) | (iv) |
Given below are two statements:
Statement I: | \(\alpha\)-hydrogen undergo aldol condensation in the presence of dilute alkali as catalyst. | Aldehydes and ketones having at least one
Statement II: | When aldol condensation is carried out between two different aldehydes, it is called cross aldol condensation. Ketones do not give this reaction. |
In light of the above statements, choose the most appropriate answer from the options given below:
1. | Statement I is correct and Statement II is incorrect. |
2. | Statement I is incorrect and Statement II is correct. |
3. | Both Statement I and Statement II are correct. |
4. | Both Statement I and Statement II are incorrect. |
Match List-I with List-II:
List-I Elements |
List-II Atomic radii (pm) |
||
(a) | O | (i) | 88 |
(b) | C | (ii) | 74 |
(c) | B | (iii) | 66 |
(d) | N | (iv) | 77 |
(a) | (b) | (c) | (d) | |
1. | (ii) | (i) | (iv) | (iii) |
2. | (iv) | (iii) | (ii) | (i) |
3. | (i) | (iv) | (iii) | (ii) |
4. | (iii) | (iv) | (i) | (ii) |
The correct reaction among the following is:
1. | |
2. | |
3. | |
4. |
The number of bridging carbonyl groups in [Co2(CO)8] and [Mn2(CO)10], respectively are:
1. | 2 and 0 | 2. | 2 and 2 |
3. | 2 and 4 | 4. | 0 and 2 |
LiF is sparingly soluble in water because it has:
1. partial covalent character.
2. small electronegativity.
3. high lattice enthalpy.
4. low hydration enthalpy.