List of top Chemistry Questions

Which of the following region is coldest ?

Sulphur reacts with chlorine in 1 : 2 ratio and forms X. Hydrolysis of X gives a sulphur compound Y. The hybridization of central atom in the anion Y is

Aqueous 10% NaHCO₃ solution is used as a reagent for identifying 'A'. Which of the following compounds yield 'A' on hydrolysis ?

A first order reaction is 50% completed in 1.26 × 10¹⁴ How much time would it takes for 100% completion ?

Which of the following fibres is made of polyamides ?

Flux is used to

The electrons identified by quantum numbers n and l, are as follows
(I) n = 4, l = 1
(II) n = 4, l = 0
(III) n = 3, l = 2
(IV) n = 3, l = 1
If we arrange them in order of increasing energy, i.e. from lowest to highest, the correct order is

Match the type of series given in Column I with the wavelength range given in Column II and choose the correct option.

Column I		Column II
A.	Lyman	1.	Ultraviolet
B.	Paschen	2.	Near infrared
C.	Balmer	3.	Far infrared
D.	Pfund	4.	Visible

The product of acid hydrolysis of (P) and (Q) can be distinguished by

Clemmensen reaction of ketone is carried out in the presence of:

Cannizzaro reaction is not shown by

The standard reduction potential for Zn²⁺/Zn, Ni²⁺/Ni and Fe²⁺/Fe are -76, -0.23 and -0.44 V, respectively.
The reaction X + Y²⁺ → X²⁺ + Y will be spontaneous when

The main product formed in the following reaction is

In the cyanide extraction process of silver from argentite ore, the oxidizing and reducing agents are respectively:

\[ \text{How many Faradays are needed to reduce 1 mol of } \text{BrO}_3^- \text{ to Br}^- \text{?} \]

When \(750 \, \text{mL}\) of \(0.5 \, \text{M} \, \text{HCl}\) is mixed with \(250 \, \text{mL}\) of \(2 \, \text{M} \, \text{NaOH}\), the value of pH will be:

The most stable carbonium ion among the following is

When \( \text{I}^- \) is oxidized by \( \text{MnO}_4^- \) in alkaline medium, it converts into:

The energy released when 6 moles of octane is burnt in air will be \[ \text{[Given, } \Delta H_f \text{ for CO}_2\text{(g), H}_2\text{O(g), and C}_8\text{H}_{18}\text{(l), respectively are -490, -240, and +160 J/mol]}. \]

Which of the following is not applicable to the phenomenon of adsorption?

In which of the following compounds does sulphur show the maximum oxidation number?

Which of the following is the correct order of stability for the given superoxides?

Among the following compounds, which compound is polar as well as exhibits sp\(^2\) hybridization by the central atom?

Which one among the following is added to soap to impart antiseptic property?

Among the following compounds, which will produce \(\text{POCl}_3\) with \(\text{PCl}_5\)?