Which of the following will produce turbidity most readily when treated with conc. HCl in presence of anhydrous \(ZnCl _2\) (Lucas reagent)?

Answer the question on the basis of passage given below :
Adsorption is a surface phenomenon and it differs from absorption which occurs throughout the body of the substance that absorbs. In physiosorption the attractive forces are mainly van der Waal's forces while in chemisorption ionic/covalent bonds are formed between particles of adsorbent and adsorbate. The catalytic activity of finely divided iron in Haber's process of ammonia manufacture can be explained by adsorption theory. Adsorption being an exothermic process, the heat of adsorption is utilised in enhancing the rate of the reaction. Adsorption has many applications being used in gas masks, control of humidity, chromatograph separation, curing diseases etc.
Which of the following is not a surface phenomenon?

Which of the following is a straight chain polysaccharide composed only of ß-Dglucose units?

Read the passage carefully and answer the Questions
The term vitamin was coined from the word vital +amine since the earlier identified compounds had amino groups.Later work showed that most of them didn't contain amino groups, so the letter "e" was dropped and ther term vitamin is used these days.
Vitamins are classified into two groups depending upon their solubility in water or fat. Fat soluble vitamins are soluble in fat and oils but insoluble in water. They are stored in liver and adipose (fat storing) tissues. Water-soluble vitamins are soluble in water. They must be supplied regularly in the diet as they are readily excreated in urine.
What is Xerophthalmia disease?

Which of the following is/are not considered as transition elements?
Ag, Mo, Zn, Hg, W

The product \((Y)\) in the following reaction is \(2\ C_6H_5CHO\ \xrightarrow{\text{conc. NaOH}, \text{Heat}} Y + C_6H_5COONa\)

Arrange the following compounds in increasing order towards Nucleophilic addition reactions:
(A) Propanal
(B) Benzaldehyde
(C) Acetone
(D) Di-tert-butyl ketone
Choose the correct answer from the options given below:

In the grass family the cotyledon is called:

Select the incorrect statement/s from the following -
(A) In human male, the testes are situated outside the abdominal cavity within a pouch.
(B) Primary spermatocytes undergo mitosis to form secondary spermatocytes.
(C) Sertoli cells provide nutrition to the germ cells.
(D) Seminal plasma is rich in glucose, calcium and certain enzymes.
Choose the correct answer from the options given below :

"Answer the question on basis of passage given below :
Carboxylic acids are weaker than mineral acids, but they are stronger acids than alcohols and many simple phenols (\(\text{pKa}\) is ~ 16 for ethanol and 10 for phenol). The higher acidity of carboxylic acids as compared to phenols can be understood similarly. The conjugate base of carboxylic acid, a carboxylate ion, is stabilised by two equivalent resonance structures in which the negative charge is at the more electronegative oxygen atom. The conjugate base of phenol, a phenoxide ion, has non-equivalent resonance structures in which the negative charge is at the less electronegative carbon atom. Further, the negative charge is delocalised over two electronegative oxygen atoms in carboxylate ion whereas it is less effectively delocalised over one oxygen atom and less electronegative carbon atoms in phenoxide ion. Thus, the carboxylate ion is more estabilised than phenoxide ion, so carboxylic acids are more acidic than phenols.
Effect of substituents on the acidity of carboxylic acids: substituents may affect the stabliity of the conjugate base and thus, also affect the acidity of the carboxylic acids. Electron withdrawing group increase the acidity of carboxylic acids by stabilising the conjugate base through delocalisation of the negative charge by inductive and/or resonance effects. Conversely, electron donating groups decrease the acidity by destabilising the conjugate base.
The correct order of decreasing acid strength of:
Acetic acid (A), Formic acid (B), Benzoic acid (C) is:"

A 20 m long horizontal wire extends from North-East to South-West. It is falling down with a speed of \(4 \mathrm{~m} / \mathrm{s}\) horizontally. The horizontal components of the earth's magnetic field is \(0.4 \times 10^{-4}\) T. Find the value of induced current in the wire if the resistance of wire is \(2 \Omega\) is :

What are the respective numbers of \( \alpha \) and \( \beta \) particles emitted respectively in the following radioactive decay?
\( {}^{200}_{90}X \rightarrow {}^{168}_{80}Y \)

Which of the following is NOT a part of a transcription unit in DNA.