List of top Chemistry Questions

The half-life of a first-order reaction is 25 minutes. Its rate constant is:

Match List I with List II

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Basic hydrolysis of esters produces:

The best proton donor is:
A) \(H_2O\)
B) \(CH_3CH_2CH_2OH\)
C) \(CH_3CH_2CH_2CH_2OH\)
D)
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Rate of a reaction is of 2nd order w.r.t A and Ist order w.r.t B. If concentration of A is halved and concentration of B becomes \(\frac{1}{3}^{rd}\) of initial concentration. The rate of reaction becomes :

Colour of Manganate ion in \(KMnO_4\) is due to:

Which one of the following statements is incorrect about enzyme catalysis?

Match List -I with List-II

	List -I		List-II
A	Buna-S	I	Vinyl chloride
B	Neoprene	II	1,3-Butadiene and styrene
C	PVC	III	Tetra flouroethene
D	Teflon	IV	Chloroprene

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Which of the following is not a heavy metal? 1

Match List I with List II

List-I		List-II
(A)	Van Arkel Method	(I)	Copper
(B)	Zone Refining	(II)	Titanium
(C)	Mond Process	(III)	Germanism
(D)	Electrolytic Refining	(IV)	Nickel

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An inorganic salt taken in a test tube was mixed with of freshly prepared ferrous sulphate solution. Concentrated sulphuric acid was then added along the walls of the test tube. Predict the formula of the compound formed:

Rate of a reaction changes from 2.48 x 10^-3 mol sec^-1 to 4.96x 10^-3 mol sec^-1 when concentration of reactant, is changes from 0.6M to 2.4 M respectively, the order of reaction is

A reaction takes 30 minutes to complete 50% of the reaction and takes 45 minutes to complete 75% of the reaction. The order of the reaction is:

Which of the following statements are true?
A. Flocculation value is inversely proportional to the coagulating power.
B. Colloidal silicon is a protective colloid.
C. Alum is used for cleaning muddy water.
D. Gelatin is added to ice cream to act as an emulsifier.
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Amongst the following, identify the condensation polymer/s:
(A) Bakelite
(B) Teflon
(C) Melamine formaldehyde resin
(D) Nylon-2 nylon-6
(E) Buna-S
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Find the correct stoichiometric coefficients in the following redox equation:
xH⁺ + yC₆H₅CH₃ + wMnO^-₄ → aH₂O + bMn²⁺ + tC₆H₅COOH

Which of the following will not form propionaldehyde?

Phenol is manufactured from hydrocarbon, Cumene. Cumene is chemically:

Match List - I with List- II.

List - I	List - II
(A) Phenols	(I) Lucas Test
(B) Ethers	(II) Reimer Tiemann reaction
(C) Alcohols	(III) Williamson's Synthesis
(D) 2, 4,6 - trinitrophenols	(IV) Picric acid

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During peptization the
precipitate breaks up into smaller particles of the size of a colloid
molecules aggregate together to form a colloid
the precipitate adsorb one of the ions of the electrolyte on its surface
precipitate is shaken with the dispersion medium
molecules loses positive and negative charge.
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Match List I with List II

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Match List-I with List-II.

List-I		List-II
(A)	Nylon	(I)	Terylene
(B)	Polyester	(II)	Caprolactam
(C)	Bakeli	(III)	Isoprene
(D)	Rubber	(IV)	Novolac

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The IUPAC name of

The reactions taking place during electrolysis of aqueous solution of CuCl₂ with platinum electrodes are :
A. Cu²⁺(aq) + 2e^- → Cu(s)
B. H⁺(aq) + e^- → \(\frac{1}{2}H_2(g)\)
C. H₂O(l) + e^- → \(\frac{1}{2}H_2(g)+^-OH(aq)\)
D. Cl^-(aq) → \(\frac{1}{2}Cl_2(g)+e^-\)
E. 2^-OH(aq) → H₂O(l) + \(\frac{1}{2}O_2(g)+2e^-\)
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Vitamin C is also called-