Aldehydes form gem-dialkoxy compound when they are reacted with:

Arrange the following solutions in increasing order of their concentration.
(A) \(7.5 \text{ g } KCl\) (74.5 g \(mol^{-1}\)) in 100 mL solution
(B) \(3 \text{ g } Urea\) (60 g \(mol^{-1}\)) in 1 L solution
(C) \(3.6 \text{ g } glucose\) (180 g \(mol^{-1}\)) in 100 mL solution
(D) \(4 \text{ g } NaOH\) (40 g \(mol^{-1}\)) in 1 L solution
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Aldehydes, carboxylic acids and ketones are widespread in the animal and plant kingdoms. They play a pivotal role in various biochemical processes of life. Their presence in nature adds fragrance and flavor. These compounds are widely used in food products, pharmaceuticals, paints, resins and other important product industries. These compounds are prepared by various laboratory methods, which mainly include oxidation, formylation, acylation and reduction. Due to the polar nature of the carbonyl group in aldehydes and ketones, they can exhibit different reactions like nucleophilic addition. They do exhibit redox and various condensation reactions which lead to the formation of various important compounds. On the other hand, the carboxylic acids are mainly prepared by oxidation and hydrolysis of different compounds. The carboxylic acid consists of a carbonyl group and the hydroxy group (attached to the carbonyl carbon atom). This makes it possible for the carboxylic acid to participate in various chemical reactions which involve cleavage of the C-OH bond and the O-H bond along with the reactions involving the complete - COOH group.
The IUPAC name of following compound is \(OHC-C_6H_4-CHO-p\)

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The speed at which a chemical reaction takes place is called the rate of reaction. The rate of reaction depends on various factors like concentration of the reactants, temperature, etc. The relation between the rate of reaction and the concentration of reacting species is represented by the equation r = k[A]^x[B]^y, where x and y are the order of the reaction with respect to the reactants A and B, respectively. The overall order of the reaction is x + y. The rate of reaction can also be increased by the use of a catalyst which provides an alternate pathway of lower activation energy. It increases the rate of forward and backward reaction to an equal extent. It does not alter the Gibbs energy of the reaction.
The role of a catalyst is to change

Why does colour of \(KMnO_4\) disappear when oxalic acid is added to its solution in acidic medium?

In case of phosphorus, \(\text{PCl}_3\) and \(\text{PCl}_5\) are possible while nitrogen only forms \(\text{NCl}_3\), and not \(\text{NCl}_5\). This due to :

Geometry of \(\left[ Ni ( CN )_4\right]^{2-}\) and \(\left[ NiCl _4\right]^{2-}\) are:

Identify the correct statements.
(A) The energy (E) and momentum (p) of a photon are related by p = E/c.
(B) The electrons and photons of the same wavelength, possess the same momentum.
(C) One photon having energy more than work function can emit one photo electron.
(D) Photons do not carry momentum.
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Arrange the following steps of DNA fingerprinting in a correct sequence.
(A) Hybridisation using labelled VNTR probe and autoradiography
(B) Digestion of DNA by restriction endonuclease and separation of fragments by electrophoresis.
(C) Blotting of separated DNA fragments to synthetic membrane.
(D) Isolation of DNA
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Arrange the trophic levels in an order from lowest to highest in a terrestrial food chain:
(A). Wolf
(B). Grass
(C). Cow
(D). Lion
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0.04 F of charge will liberate how much of oxygen gas (at STP) from acidified water?

If \(y=500 e^{7 x}+600 e^{-7 x}\), then \(\frac{d^2 y}{d x^2}\) is equal to :

Which of the following is not true for the image found in a plane mirror?
The image is: