Which reagent can be employed to distinguish Benzaldehyde and Propanal ?

Consider the two complex ions \(\text{[CoF}_6]^{3-}\) and \(\text{[Co(C}_2\text{O}_4)_3]^{3-}\), which of the following statement (s) is/are false :
(A) Both are octahedral.
(B) \(\text{[Co(C}_2\text{O}_4)_3]^{3-}\) is diamagnetic, while \(\text{[CoF}_6]^{3-}\) is paramagnetic.
(C) Both are outer orbital complexes.
(D) In both the complexes the central metal is in the same oxidation state.
Choose the correct answer from the options given below :

The type of isomerism exhibited by the complex \([\text{CoCl}_2 (\text{en})_2]\) is:

Which sodium halide is employed in Finkelstein reaction?

Mercury cell used in hearing aid devices contains anode comprising of

Which one of the following ligands forms a chelate?

Read the following passage given below and answer the question.
Aldehydes and ketones undergo nucleophilic addition reactions. A nucleophile attacks the electrophilic carbon atom of polar carbonyl group from perpendicular to plane of \(sp^2\) hybridised orbitals of carbonyl carbon. The hybridisation of carbon changes from \(sp^2\) to \(sp^3\) and a tetrahedral alkoxide intermediate is formed. This captures \(H^+\) to give neutral product. In carboxylic acids, carbonyl carbon is less electrophilic than carbonyl carbon in aldehydes and ketones.
An organic compound \(C_3H_6O\) does not give a precipitate with 2,4-dinitrophenylhydrazine and also does not react with metallic sodium. It could be :

Which of the following statements are correct?
(A) According to wave theory, energy carried by a wave depends on the amplitude of the wave, not on the speed of wave propagation
(B) For a given frequency, intensity of light in the photon picture is determined by the number of photons crossing a unit area
(C) At a large distance from the source, a small portion of the spherical wave can be approximated by a plane wave
(D) the reflected and refracted light both have different frequencies than the incident frequency
Choose the correct answer from the options given below:

The process used for the conversion of sugar into Ethanol is :

Arrange the following in the increasing order of their energy gap between their conduction and valence bands:
(A) Si
(B) C (diamond)
(C) Ge
(D) Sn
choose the correct answer from the options given below:

Consider the following hypothesis test:
\( \begin{array}{l} H_0: \mu \leq 12 \\ H_a: \mu>12 \end{array} \)
A sample of 25 provided a sample mean \(\bar{x}=14\) and a sample standard deviation \(S=4.32\). If \(t_{0.05}=1.711\), then which of the following is correct?
(A) The test statistic is defined as \(t=\frac{\bar{x}-\mu}{S / \sqrt{n}}\).
(B) The value of the test statistic is 1.31 .
(C) At \(\alpha=0.05\), the null hypothesis is rejected.
(D) If the value of the \(t\)-statistic is less than \(t_\alpha\), then null hypothesis is accepted.
Choose the correct answer from the options given below:

Internal resistance of a cell is:
A. decreases with increase in the distance between electrodes.
B. increases with increase in the area of electrodes inside electrolyte.
C. decreases with increase in temperature.
D. doesn't depend on the concentration of the electrolyte.
Choose the correct answer from the options given below:

Let \(\vec{a}=2 \hat{i}-\hat{j}, \vec{b}=-4 \hat{j}+\hat{k}\) and \(\vec{c}=\hat{i}+2 \hat{k}\). If \(\vec{d}\) is a vector perpendicular to both \(\vec{a}\) and \(\vec{b}\) such that \(\vec{c} \cdot \vec{d}=34\), then \(|\vec{d}|\) is equal to