The product \(( Y )\) in the following reaction is
\(2 C_6 H_5 CHO \xrightarrow[\text { Hest }]{\text { conc. } NaOH} Y+C_6 H_5 COONa\)

Arrange the given compounds in order of decreasing oxidation state of nitrogen:
A. \(N_2\)
B. \(NO\)
C. \(HNO_3\)
D. \(NH_4Cl\)
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A colloid is a heterogeneous system in which a substance is dispersed (dispersed phase) as fine particles in another substance called dispersion medium.
Their particle size is intermediate between that of pure solutions (less than 1 nm ) and suspensions (greater than 1000 nm ).
They are known for interesting properties such as enormous surface area, Tyndall effect, Brownian motion etc.
They are widely used in industries and day to day life.
Some prominent uses of colloids are those in smoke precipitators, purification of water, medicines, cleansers etc.
Stability of a colloid is intermediate between that of a solution and suspension. This stability can be attributed to _____________
A. Presence of charge on the particles of dispersed phase.
B. Prolonged mechanical stirring.
C. Solvation by the dispersion medium.
D. Brownian Motion.
E. Dialysis
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The unit for molar conductivity is

Vapour pressures of chloroform \(\left( CHCl _3\right)\) and dichloromethane \(\left( CH _2 Cl _2\right)\) at 298 K are 200 mmHg and 415 mmHg , respectively. Calculate the vapor pressure of the solution prepared by mixing 0.2 mol of \(CHCl _3\) and 0.5 mol of \(CH _2 Cl _2\) at 298 K

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Strong oxidising agents oxidise toluene and its derivatives to benzoic acid. However, it is possible to stop the oxidation at the aldehyde stage with suitable reagents that convert the methyl group to an intermediate that is difficult to oxidise further.
Reagents which do not have any action on ketones are:
(A) Schiff's reagent
(B) \(\text{KMnO}_4\)
(C) Tollen's reagent
(D) Fehlings reagent
(E) \(\text{LiAlH}_4\)
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Choose the statements that are valid for the molecularity of a reaction
(A) Molecularity is equal to the number of reacting species involved in the overall reaction
(B) Decomposition of ammonium nitrite is an example of unimolecular reaction
(C) Reactions with the molecularity three are very rare
(D) Molecularity can only be determined experimentally
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The noble gases He to Rn have close shell configuration and are monoatomic gases under normal conditions. Though mostly unreactive, but direct reaction of Xe with \(F_2\) leads to a series of compounds with Xe oxidation numbers \(+2,+4\) and +6 . When certain compounds like phenol and quinol are crystallised in the presence of noble gas such as \(Ar , Kr\) and Xe a category of compound called clathrates are formed. In these the noble gas atoms are trapped in the cavities of the crystal lattices. The compounds which crystallise are known as hosts (H) while the noble gas atoms are called guests ( \(G\) ). The general formula of a clathrate compound is \(n H m G\), where \(n\) is the number of host molecules and m is the number of atoms a molecule of guest.
In what molar ratio must Xe and \(F_2\) be taken to give \(XeF _4\) ?

Which one of the following diagnostic techniques is based on the principle of antigen-antibody interaction?

Thiosulphte \(\mathrm{S}_2 \mathrm{O}_3^{2-}\) is oxidized to __________ in presence of permanganate ion.

Which position of phenol is involved in coupling reaction with benzene diazonium chloride ?

Which of the complexes give white precipitate when treated with aqueous solution of \(BaCl_2\)?
\(\left[ Co \left( NH _3\right)_5 SO _4\right] Cl\)
\(\left[ Co \left( NH _3\right)_5 Cl \right] SO _4\)
\(\left[ Co \left( NH _3\right)_5\left( NO _2\right)\right]\left( NO _2\right)_2\)
\(\left[ Co \left( NH _3\right)_5 CN \right] SO _4\)
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A balloon which always remains spherical, has a variable diameter, \(\frac{3}{2}(5 x+7)\). Then the rate of change of its volume with respect to x is