A first order reaction is 50% completed in \(1.26 \times 10^{14}\) s.
How much time would it take for 100% completion?

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Carbohydrates are essential for both plants and animals. Some common examples of carbohydrates are glucose, fructose, sucrose, glycogen, cellulose and starch. They form a major portion of our food. Honey has been used for a long time as an instant source of energy in Ayurvedic medicine. Carbohydrates are used as storage molecules in both plants and animals. The cell wall of bacteria and plants is made of cellulose. We use cellulose in the form of wood for making furniture and as cotton fiber for clothing. They also provide raw material for textiles,
paper, lacquers, and breweries. Carbohydrates are classified as Monosaccharides, Oligosaccharides and Polysaccharides on the basis of their behavior towards hydrolysis. Monosaccharides cannot be hydrolyzed further to simpler units whereas oligosaccharides can yield 2-10 units of monosaccharides on hydrolysis. Polysaccharides, which are non-sugars yield a large number of monosaccharide units on hydrolysis.
Answer the following questions about carbohydrates:
Hydrolytic products of maltose are?

Identify the product ' \(X\) ' and ' \(Y\) ' in the following reaction.

Match the complex species given in List-l with the possible isomerism given in List-ll:

List-l Complex species	List-ll Isomerism
(A) \(\left[ Co \left( NH _3\right)_4 Cl _2\right]^{+}\)	(I) optical
(B) cis- \(\left[ Co ( en )_2 Cl _2\right]^{+}\)	(II) ionization
(C) \(\left[ Co \left( NH _3\right)_5\left( NO _2\right)\right] Cl _2\)	(III) coordination
(D) \(\left[ Co \left( NH _3\right)_6\right]\left[ Cr ( CN )_6\right]\)	(IV) geometrical

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Match List I with List II.

List-I	List-II
(A) \(4 M +8 CN ^{-}+2 H _2 O + O _2 \xrightarrow{\Delta} 4\left[ M ( CN )_2\right]^{-}+4 OH ^{-}\)	I. Roasting
(B) \(Al _2 O _3+2 NaOH +3 H _2 O \xrightarrow{\Delta} 2 Na \left[ Al ( OH )_4\right]\)	II. Leaching
(C) \(PbS \xrightarrow{\Delta} PbO\)	III. Cyanide process
(D) \(Cu _2 S \xrightarrow{\Delta / C } Cu\)	IV. Self reduction

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Which transition metal group is known as coinage metals?

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The carbonyl group of aldehydes and ketones is highly polar. The positively charged carbon is readily attacked by electron-rich nucleophile and the negatively charged oxygen atom is attacked by an electro-deficient electrophile. Aldehydes and ketones undergo nucleophilic addition reactions in the presence of acid or a base. The mechanism involves attack of a nucleophile on the electron deficient carbonyl carbon to form a tetrahedral intermediate. A new bond is formed between the carbon and oxygen. Protonation of the anion furnished by the reaction medium yields a neutral addition product. The addition product is same whether the reaction is catalyzed by acid or a base. For example in the presence of base aldehydes and ketones react with hydrogen cyanide to form cyanohydrin.
The source of nucleophile in the base catalyzed cyanohydrin formation is:

What is the product formed when benzyl ethyl ether reacts with HI?

The general solution of the differential equation \(x\left(\frac{d y}{d x}\right)=y+x \tan \left(\frac{y}{x}\right)\) is

What will be the momentum of a photon of energy 0.1 MeV in SI unit?

Arrange the following in increasing order of basic strength in aqueous solution :
(A) \(C _6 H _5 NH _2\)
(B) \(C _2 H _5 NH _2\)
(C) \(\left( C _2 H _5\right)_2 NH\)
(D) \(NH _3\)
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Which of the following has zero average value in a plane electromagnetic wave?
(A) Electric field
(B) Magnetic field
(C) Electric energy
(D) Magnetic energy
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A displacement current of 1.0 A is established in the space between the two parallel plates of 1 \( \mu\text{F} \) capacitor. The rate of change of voltage across the capacitor is: