Which of the following is the correct order of second ionization enthalpy?

A solution of copper sulphate cannot be stored in zinc vessel because:

Match List I with List II

LIST - I	LIST - II
A. \(\left( CH _3\right)_3 N, CH _3 CH _2 CH _2 NH _2\)	I. Tollen's test
B. \(HCOOH , CH _3 COOH\)	II. Lucas test
C. \(CH _3- C (= O )- CH _2- CH _2- CH _3, CH _3- CH _2- C (= O )- CH _2-CH _3\)	III. Carbylamine test
D. \(CH _3- CH _2- CH _2- CH _2- OH , CH _3- C \left( CH _3\right)( OH )- CH _3\)	IV. lodoform test

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Consider the following reactand identify A and B.

Which of the following elements does not show allotropy?

Answer the question on the basis of passage given below :
Nitrogen differs from rest of the members of group 15 due to its small size, high electronegativity, high ionization enthalpy and non-availability of d orbitals. Nitrogen has unique ability to form pa - pa multiple bonds with itself and with other elements having small size and high electronegativity. Heavier elements of this group do not form pa - pr bonds as their atomic orbitals are so large and diffuse that they cannot have effective overlapping.
Group 15 elements forms oxides of type \(E _2 O _3\). Acidic oxides are formed by
A. Bi
B. Sb
C. P
D. As
E. N
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Read the passage carefully and answer the Questions
Carboxylic acids are the earliest organic compounds isolated from nature. These are also known as organic acids but are weaker acids as compared to mineral acids. However, they are more acidic than alcohols and phenols because of greater resonance stabilization of the parent acid and its conjugate base. The acidic strength is determined by the \(K _a\), which is called the acidity constant. The greater the value of \(K _a\), the greater the tendency of the acid to ionize and hence the stronger the acid. The acidic strength of the saturated aliphatic carboxylic acid depends upon the inductive effect and its position with respect to - COOH groups. Electron -donating substituents tend to decrease whereas electron -withdrawing substituents tend to increase the acidic strength. The acidic strength of the aromatic carboxylic acid, on the other hand depends upon both the inductive effect and the resonance effect of the substituents.
p-Nitrobenzoic acid is a stronger acid than benzoic acid because of

In reference to Bt cotton, select the correct statement(s) :
(A) The alkaline pH of an insect gut solublises the crystals of Bt toxin
(B) The acidic pH of an insect gut solublises the crystals of Bt toxin
(C) The Bt toxin does not kill the tobacco budworm
(D) Specific Bt toxin genes were isolated from Bacillus thuringiensis
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The corner points of the feasible region determined by the following system of linear inequalities \(2 x+y \leq 10, x+3 y \leq 15, x, y \geq 0\) are \((0,0),(5,0),(3,4)\) and \((0,5)\). Let \(z=p x+q y\) where \(p\) and \(q>0\). The condition on \(p\) and \(q\) so that the maximum of \(z\) occurs at both \((3,4)\) and \((0,5)\) is :

The mutual inductance of two co-axial coils is 2 H. If the current in one coil changes uniformly from zero to 1.0 A in 100 ms, the emf induced in the other coil is

A manufacturer can sell x items at a price of mp 3x + 5 each. The cost price of x items is ₹\(x^2\ + 5x.
If z is the number of items she should sell to get no profit and no loss, then:

The process of breeding crops for higher level of proteins, vitamins and/or oil content is called

Arrange the following electromagnetic waves in increasing order of their frequency.
A. Television and FM radio waves
B. X-rays
C. Long radio waves
D. Microwaves
E. Infrared red waves
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