Lanthanoids (Ln) when heated with S, generally give _________ .

In aldehydes, the carbonyl group is bonded to a carbon and hydrogen, while in ketones it is bonded to two carbon atoms. The carbonyl compounds in which carbonyl group is bonded to oxygen are known as carboxylic acid and their derivatives.
Arrange the following steps of Aldol condensation in the correct order of their occurance.
A. Abstraction of proton
B. Protonation
C. Formation of Enolate
D. Nucleophilic Addition
E. Elimination
Choose the correct answer from the options given below:

Read the passage carefully and answer the questions
The resistance ( \(R\) ) of an object is given by the expression \(R=\rho \frac{l}{A}\).
The inverse of \(R\) is called conductance and the inverse of \(\rho\) is called conductivity or specific conductance represented by \(\kappa\).
The conductivity depends upon the nature of the material (insulator, semiconductor or conductor) and the temperature of the substance.
Similarly, the conductance due to the ions present in the solution (ionic conductance) depends upon the nature of the electrolyte, size of ions, the nature of the solvent and the temperature.
Molar conductivity ( \(\Lambda_m\) ) of a solution at a given concentration is the conductance of volume \(V\) containing one mole of electrolyte kept between two electrodes of area \(A\) and unit distance apart. It is given by the expression \(\Lambda_m=\kappa V\).
Molar conductivity increases with decrease in concentration and when concentration approaches zero, it is called limiting molar conductivity.
The decrease is linear for a strong electrolyte. However, for a weak electrolyte the change is gradual at higher concentrations and sharp near zero concentration.
Using limiting molar conductivity values of strong electrolytes we can calculate the limiting molar conductivity of weak electrolytes using Kohlrausch law of independent migration of ions.
From molar conductivity and limiting molar conductivity we can determine the degree of dissociation \(\left(\frac{\Lambda_m}{\Lambda_m^0}\right)\) and the ionization constant of a weak acid.
Which of the following is an insulator?

Choose the correct statement/statements:
(A) Denaturation of protein causes loss of secondary and tertiary structure
(B) Nucleotides are joined together by diester linkage
(C) DNA contains Adenine, Guanine, cytosine and Uracil
(D) Amino acids show amphoteric behaviour
Choose the correct answer from the options given below :

Which one of the following ions is paramagnetic in nature?

What is the hybridisation of metal ion in \(\left[ Ni ( CO )_4\right]\) compound?

What types of bond (linkage) are present in nucleotide?

The value of \(\int_{-a}^a f(x) d x\) where \(f(x)=\frac{7^x}{1+7^x}\), is :

Benzene ring in phenol is expected to give the characteristic substitution or replacement reactions i.e. halogenation, nitration, sulphonation, alkylation etc. In these reactions, the attacking reagent is electrophile. The phenolic group activates the ortho and para positions in the ring due to conjugation. Disubstitution reactions are quite fast as the electron density in the ring has increased considerably. Phenols do not respond to nucleophilic substitution reactions as it is influenced by phenolic group.

The type of pollination which brings genetically different types of pollen grains to the stigma is -

If \(A=\left[\begin{array}{cc}a \cos \theta & b \sin \theta \\ -b \sin \theta & a \cos \theta\end{array}\right]\), then \(A^{-1}\) is equal to:

Which of the following complexes will show absorbance of light at the lowest wavelength?

Two cards are drawn successively with replacement from a well-shuffled deck of 52 cards.
The probability distribution of number of aces is given by :