The decomposition of ammonia on platinum surface is a zero order reaction. How much time it will take for \(1 \times 10^{-4}\ mol\ L^{-1}\) of ammonia to reduce into half of its concentration ?
(\(K = 0.5 \times 10^{-4}\ mol\ L^{-1}\ s^{-1}\))

In the formation of a Leclanche cell, the space between electrodes is filled with:
(A) \(ZnCl _2\)
(B) \(NH _4 Cl\)
(C) \(AlCl _3\)
(D) ZnS
(E) \(NH _4 NO _3\)
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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 statements are correct?
A. Dry ether is used in Wurtz reaction.
B. Grignard reagent is an example of organo metallic compound
C. Bond clevage of C-Cl is easier in haloarene than haloalkane
D. Chlorobenzene does not show Friedel Crafts reaction.
E. Enantiomers differ with respect to rotation of plane polarised light.
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Carbonyl compounds such as aldehydes, ketones, and carboxylic acids play an important role in the biochemical process of plants and animal kingdom. Many aldehydes and ketones find applications in dye, perfumery and other industries.
The carbonyl carbon atom is \(s p^2\)-hybridized forming three sigma and one pi-bond with oxygen.
C-O bonds are polar bond due to high electronegativity of oxygen than carbon.
Hence the carbonyl carbon behaves as an electrophilic center and oxygen as a nucleophilic centre.
Primary and secondary alcohols yield aldehydes and ketones respectively upon oxidation with variety of oxidizing agents.
The boiling points of aldehydes and ketones differ from hydrocarbons and ethers.
Aldehydes and ketones undergo nucleophilic addition reaction due to presence of electrophilic carbonyl carbon.
Nucleophile and a proton add across the carbon oxygen double bond.
Identify the product Y in the following reaction.
\(CH_3-CH=CH-CH_2 OH \xrightarrow{\text { Pyrididium Chlorochromate }} Y\)

The correct bond order for the carbon-oxygen bond in the following metal carbonyls \(\left[ Cr ( CO )_6\right],\left[ V ( CO )_6\right]^{-},\left[ Mn ( CO )_6\right]^{+}\)is:

Monochlorination of toluene in sunlight followed by hydrolysis with aqueous \(NaOH\) yields :

The forbidden energy gap for Si is

A wire of length 4 m carrying current I A is bent in the form of a circle. Its magnetic moment will be :

Read the passage and answer the question : There are thousands of varieties of rice in India alone. The diversity of rice in India is one of the richest in the world. Basmati rice is distinct for its unique aroma and flavour and 27 documented varieties of Basmati are grown in India. There is reference to Basmati in ancient texts, folklore and poetry, as it has been grown for centuries. Several attempts have also been made to patent uses, products and processes based on Indian traditional herbal medicine, e.g. turmeric, neem. There has been growing realisation of the injustice, inadequate compensation and benefit sharing between developed and developing countries. The Indian Parliament has recently cleared a Bill that takes such issues into consideration, including patent terms emergency provisions and research and development initiative.
The bill cleared by Indian Parliament to check unauthorised exploitation of bioresources and traditional knowledge of bio-resources is

A charged particle enters a uniform magnetic field at an angle of \(45 ^\circ\) with the field. The path along which the particle moves in the field will be

In agarose gel electrophoresis, the separated DNA fragments can be visualised by staining the DNA with a compound, known as

A radioactive sample has a half life of 12 years. The fraction of sample that will decay in 24 years is :