A brown ring is formed in the ring test for \(NO _3^{-}\)ion. It is due to the formation of:

For a complex reaction, the order of reaction is equal to:

Match List - I with List - II

List - I	List - II
(A) Chloroxylenol + terpineol	(I) Antiseptic
(B) Penicillin	(II) Antibiotic
(C) Iproniazid	(III) Tranquillizer
(D) Aspirin	(IV) Analgesic

Choose the correct answer :

Why is HCl not used to make the medium acidic in oxidation reactions of KMnO₄ in acidic medium?

What product(s) is formed when an Alkyl halide undergoes ammonolysis ?
(A) Primary amine
(B) Secondary amine
(C) Quaternary ammonium salt
(D) Tertiary amine
Choose the correct answer from the options given below:

Vacancy and interstitial defects in solids are examples of :

Read the passage carefully and answer the questions
Ethers with the general formula \(C _n H _{2 n+2} O\) and functional group C-O-C may be divided as symmetrical and unsymmetrical.
Lower symmetrical ether may be obtained by the dehydration of alcohols at low temperatures in the presence of protic acids,
such as \(H _2 SO _4\) and \(H _3 PO _4\) whereas at high temperature intramolecular dehydration takes place.
Formation of ether from primary alcohols is also accompanied by the formation of small amount of alkenes.
Due to the steric hinderance, secondary and tertiary alcohols undergo elimination reaction rather than substitution reaction yielding alkene as major product. Ethers can also be obtained by heating alkyl halides with sodium or potassium alkoxides.
Substituted Ethers (secondary & tertiary) can also be prepared using this method.
If primary halides are replaced with secondary and tertiary halides, alkenes are the major products.
The major product in the following reaction is

According to the Biot- Savart law, the magnetic field due to a current element is
(A) inversely proportional to the square of the distance from the current element to the point of interest.
(B) produced by a vector source.
(C) perpendicular to the plane containing the displacement vector and the current element.
(D) non-zero at any point in the direction of the current element.
Choose the correct answer from the options given below:

The solution of \(y^{\prime}-y^{\prime \prime}=2 x\) is:
A. \(y=x^2+2 x+2\)
B. \(y=x^2+2 x+1\)
C. \(y=x+2\)
D. \(y=x^2-2 x+1\)
Choose the correct answer from the options given below :

Methanogens do not produce:

Potassium tetrahydroxydozincate(II) can be represented by which of the following formula?

Corner points of the feasible region for a linear programming problem are \((0,2),(3,0),(6,0),(6,8)\) and \((0,5)\). Let \(F=4 x+6 y\) be the objective function. Then the minimum value of \(F\) occurs at :

Baculoviruses are pathogens that attack -