The following reaction is known as

Question based on the following passage :
P-Block elements are placed in group 13 to 18 in the periodic table. Group 15 is nitrogen family.
Nitrogen can react with hydrogen, oxygen, halogens etc. It shows multiple oxidation states in its various oxides i.e. \(N_2O, N_2O_3, N_2O_5\) etc. Important allotropic forms of phosphorus are white, red and black phosporus. Various compounds of phosphorus are phosphine, \(PCl_3, PCl_5\) and oxoacids of phosphorus. Oxidation states \(+1\) to \(+5\) are seen in various oxoacids of phosphorus. Group 17 elements are collectively known as halogens. Bond dissociation enthalpy of \(F_2\) is smaller than \(Cl_2\).
The gases present in group 18 are chemically unreactive, they form only few compounds. Neil Bartlett (in 1962) observed the reaction of a noble gas. Since then, many noble gas compounds have been synthesised.
The bond angle in \(PH_3\) is less than \(PH_4^+\) due to :

The correct order of decreasing \(pK _{ a }\) values of the following compounds

The correct statements about \(Cr ^{2+}\) and \(Mn ^{3+}\) are : (atomic number of \(Cr =24\) and \(Mn =25\) )
(A) \(Cr ^{2+}\) is a reducing agent
(B) \(Mn ^{3+}\) is an oxidising agent
(C) Both \(Cr ^{2+}\) and \(Mn ^{3+}\) exhibit \(d^4\) electronic configuration
(D) When \(Cr ^{2+}\) is used as reducing agent chromium ion attains \(d^5\) electronic configuration Choose the \(\backslash\) textbf\{correct\} answer from the options given below :

Complete the reaction:
\(\text{NH}_2\text{CONH}_2 + \text{H}_2\text{O} \rightarrow \text{ ?}\)

Based on CFT, in octahedral crystal field, d orbitals split into orbitals of \(t_{2g}\) and \(e_{g}\) sets. Which d orbitals forms the \(t_{2g}\) set?

Which of the following compounds will not give a red precipitate
when heated with Fehling's solution?

A brown ring is formed in the ring test for \(NO_3^-\text{}\) ion. It is due to the formation of

An electric motor operating on a 50 V dc supply draws a current of 12 A. If the efficiency of the motor is 30%, the estimated resistance of the motor would be :

Which of the following statements is not true with reference to a potentiometer ?

Read the passage carefully and answer the given questions.
DNA Fingerprinting
Polymorphism in DNA sequence is the basis of genetic mapping of the human genome as well as of DNA fingerprinting. DNA fingerprinting involves identification of differences in some specific regions in the DNA sequence called repetitive DNA. It works on the principle of polymorphisms in DNA sequences. The repetitive DNA are separated from bulk genomic DNA. The bulk DNA forms a major peak and the other small peaks are referred to as satellite DNA. These repetitive/satellite DNA sequences show a high degree of polymorphisms and form the basis of DNA fingerprinting.
Which one of the following techniques is involved in DNA fingerprinting?

Choose the correct statement/statements for Cannizaro reaction.
A. Takes place in aldehydes and ketones having absence of \(\alpha\)-hydrogen
B. Takes place in aldehydes having absence of \(\alpha\)-hydrogen
C. It is a disproportionation reaction
D. Get a mixture of carboxylic acid salt and ethers
Choose the correct answer from the options given below:

If two thin convex lenses are kept in contact, the focal length of the combination is :