List of top Chemistry Questions

Consider the reaction $Cu^{2+} + X^- → Cu_2X_2 + X_2$.
X² will be predominantly?

XeF$_4$ reacts with SbF$_5$ to form:
\[ [\text{XeF}_m]^{n+}[\text{SbF}_y]^{z-} \] What is $m+n+y+z$?

Incorrect statement about Borazine is:

CH₃CH₂-Br $\overrightarrow{Acetone}^{NaI}$ CH₃-CH₂-I+NaBr
Which of the following statement is correct ?

Select the correct order of electronegativity of the elements: B, C, At, S

Consider the following:

D.D.T.
Aldrin
Sodium arsenite
Sodium chlorate

How many of these are pesticides?

Polymer which is named as orlon is:

Predict expression from α in terms of $K_{eq}$ and concentration C :

$A_2 B_3(aq) \leftrightharpoons 2{A_3} (aq)+3B_{{2-}}(aq)$

Match the following with the correct name of reaction

Number of ambidentate ligands in given complex [M_(en)(SCN)₄]:

Match the terms in Column-I with their description in Column-II and choose the correct option :

Column I		Column II
(i)	Vitamin A	a	Beri-beri
(ii)	Vitamin C (Ascorbic acid)	b	Cheilosis
(iii)	Riboflavin	c	Xerophthalmia
(iv)	Thiamine	d	Scurvy

Order of Covalent bond:
A. $KF > KI ; LiF > KF$
B. $KF < KI ; LiF > KF$
C. $SnCl _4> SnCl _2 ; CuCl > NaCl$
D. $LiF > KF ; CuCl <NaCl$
E. $KF < KI ; CuCl > NaCl$
Choose the correct answer from the options given below:

Which of the following have square pyramidal structure?

Product (P) and (Q) are respectively

2[Au(CN)₂]^– + Zn $\to$ [Zn(CN)₄]^2– + 2Au$\downarrow$ is which of these
(A) Redox reaction
(B) Displacement reaction
(C) Combination reaction
(D) Decomposition reaction

If the radius of ground state hydrogen is 51 pm, find out the radius of 5th orbit of Li²⁺ ions. (closest integer)

Photochemical smog found mainly in

Choose the correct option.

A binary compound has Y-atoms forming FCC unit cell and another type of X-atoms occupying $\frac{1}{3}$^rd of tetrahedral voids. Find out the molecular formula of the compound

Determine the amount of urea (NH₂CONH₂) to be added in 1000 g of water to decrease its vapour pressure by 25%.

In which of the following pairs of elements electron gain enthalpy difference is highest?

Which of the following reaction is correct?

Reaction of $BeO$ with ammonia and hydrogen fluoride gives A which on thermal decomposition gives $BeF _2$ and $NH _4 F$ What is ' $A ^{\prime}$ ?

Reaction of thionyl chloride with white phosphorus forms a compound [A], which on hydrolysis gives [B], a dibasic acid $[ A ]$ and $[ B ]$ are respectively

Oxidation number of Mo in Ammonophosphomolybdate

Reaction	Name of reaction
(I)	(P)	Gattermann Koch reaction
(II)	(Q)	Hell Volhard Zelinsky
(III)	(R)	Iodoform reaction