List of top Chemistry Questions

The final product [B] is:

Given below are two statements:
Statement I: Sucrose is dextrorotatory. However, sucrose upon hydrolysis gives a solution having mixture of products. This solution shows laevorotation.
Statement II: Hydrolysis of sucrose gives glucose and fructose. Since the laevorotation of glucose is more than the dextrorotation of fructose, the resulting solution becomes laevorotatory.
In the light of the above statements, choose the correct answer from the options given below.

Given below are two statements: Statement I: The increasing order of boiling point of hydrogen halides is HCl<HBr<HI<HF. Statement II: The increasing order of melting point of hydrogen halides is HCl<HBr<HF<HI. In the light of the above statements, choose the correct answer from the options given below:

By usual analysis, 1.00 g of compound (X) gave 1.79 g of magnesium pyrophosphate. The percentage of phosphorus in compound (X) is : _________ (nearest integer)
(Given, molar mass in g mol\(^{-1}\) ; O = 16, Mg = 24, P = 31)}

Given below are two statements: Statement I: The halogen that makes longest bond with hydrogen in HX, has the smallest covalent radius in its group.
Statement II: A group 15 element's hydride \(EH_3\) has the lowest boiling point among corresponding hydrides of other group 15 elements. The maximum covalency of that element \(E\) is 4.
In the light of the above statements, choose the correct answer from the options given below.

As compared with chlorocyclohexane, which of the following statements correctly apply to chlorobenzene?
The magnitude of negative charge is more on chlorine atom.
The C--Cl bond has partial double bond character.
C--Cl bond is less polar.
C--Cl bond is longer due to repulsion between delocalised electrons of the aromatic ring and lone pairs of electrons of chlorine.
The C--Cl bond is formed using \(sp^2\) hybridised orbital of carbon.
Choose the correct answer from the options given below:

When $1$ g of compound $(X)$ is subjected to Kjeldahl's method for estimation of nitrogen, $15$ mL of $1$ M $\mathrm{H_2SO_4}$ was neutralized by ammonia evolved. The percentage of nitrogen in compound $(X)$ is:

How will you confirm the presence of five –OH groups in a glucose molecule, which are attached to different carbon atoms?

A first row transition metal (M) does not liberate \( \mathrm{H_2} \) gas from dilute HCl.

1 mol of aqueous solution of \( \mathrm{MSO_4} \) is treated with excess aqueous KCN and then \( \mathrm{H_2S(g)} \) is passed through the solution.

The amount of \( \mathrm{MS} \) (metal sulphide) formed from the above reaction is ________ mol.

Based on Valence bond theory, explain why the geometry of [Ni(CO)₄] is tetrahedral and [Ni(CN)₄]²- is square planar.

(a) (i) Explain the thermodynamics of cell reactions.
(ii) Why salt bridge is used in Galvanic cells?

What is Lanthanoid contraction? What are the causes and effects of Lanthanoid contraction?

(a) (i) Differentiate crystalline solids and amorphous solids.
(ii) Explain the rate determining step with an example.

Explain the mechanism of Cannizzaro reaction.

(a) (i) Differentiate crystalline solids and amorphous solids.
(ii) Explain the rate determining step with an example.

(i) How will you convert benzene diazonium chloride to biphenyl? Give the name of the reaction.
(ii) How will you confirm the presence of keto group at C-2 carbon in Fructose molecule?

List any three characteristics of catalysts.

Prove that in case of first order reaction t₉₉.₉% = 10 t₁/₂

An organic compound (A) with molecular formula C₂H₇N reacts with nitrous acid to form compound (B) which is unstable. Hence compound (B) gets converted to compound (C). Compound (C) is used as a substitute for petrol. Identify compounds (A), (B) and (C).

What are hormones? Give examples.

(i) Give any three uses of silicones.
(ii) Write a short note on Fischer-Tropsch synthesis.

Calculate the percentage efficiency of packing in case of body centered cubic (BCC) structure.