List of top Chemistry Questions

Given below are two statements, one is labelled as Assertion $A$ and the other is labeled as Reason $R$
Assertion A : The alkali metals and their salts impart characteristic colour to reducing flame
Reason R : Alkali metals can be detected using flame tests
In the light of the above statements, choose the most appropriate answer from the options given below

Which one among the following metals is the weakest reducing agent?

Compound A reacts with $NH _4 Cl$ and forms a compound B.

Compound B reacts with $H _2 O$ and excess of $CO _2$ to form compound $C$ which on passing through or reaction with saturated $NaCl$ solution forms sodium hydrogen carbonate Compound $A , B$ and $C$, are respectively.

Sum of $\pi$-bonds present in peroxodisulphuric acid and pyrosulphuric acid is___________

The total number of acidic oxides from the following list is: $NO , N _2 O , B _2 O _3, N _2 O _5$, $CO , SO _3, P _4 O _{10}$

Match List I with List II

LIST I		LIST II
A	X_eF₄	I	See-saw
B	SF₄	II	Square planar
C	NH₄+	III	Bent T-shaped
D	BrF₃	IV	Tetrahedral

Choose the correct answer from the options given below :

Match List I with List II

LIST I Elements		LIST II Colour imparted to the flame
A	K	1	Brick Red
B	Ca	2	Violet
C	Sr	3	Apple Green
D	Ba	4	Crimson Red

Choose the correct answer from the options given below:

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

If the formula of borax is $Na_2B_4Ox(OH)y.zH_2O$ , Find the value of x + y + z.

How many of the following have five radial nodes ?
5s, 6s, 7s, 6p and 4p

In good quality cement ratio of lime total oxides of Si(SiO$_2$), Aluminium(Al$_2$O$_3$) and Iron(Fe$_2$O$_3$) should be as close as possible to _____ .

Which one among the following metals is the weakest reducing agent?

Total number of acidic oxides among $N_2O_3,NO_2, N_2O,Cl_2O_7,SO_2,CO,CaO,Na_2O$ and NO is ____ .

Mg(NO₃)₂. XH₂O and Ba(NO₃)₂.YH₂O, represent formula of the crystalline forms of nitrate salts. Sum of X and Y is _____________ .

For compound having the formula GaCl$_3$, the correct option from the following is:

The correct order in aqueous medium of basic strength in case of methyl substituted amines is :

Match the following with the correct name of reaction

Group–13 elements react with $ O_2 $ in amorphous form to form oxides of type $ M_2O_3 $ (M = element). Which among the following is the most basic oxide?

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

	Amino Acid		Letter Code
(A).	Alanine	(P).	N
(B).	Asparagine	(Q).	A
(C).	Aspartic acid	(R).	R
(D).	Arginine	(S).	D

Given below are two statements:
Statement I : Pure Aniline and other arylamines are usually colourless.
Statement II : Arylamines get coloured on storage due to atmospheric reduction.
Choose the correct answer

How many of the transformations given below would result in aromatic amines?

Match List I with List II

LIST I (Amines)		LIST II (pKb)
A	Aniline	I	3.25
B	Ethanamine	II	3.00
C	N-Ethylethanamine	III	9.38
D	N, N-Diethylethanamine	IV	3.29

Choose the correct answer from the options given below:

Statement-1: Methyl orange is a weak acid
Statement-2: Benzenoid form of methyl orange is deeply coloured than quinonoid form
Check out which of the above statement is true?

Compound ‘B’ is

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