List of top Chemistry Questions

The bond lengths and bond angles in the molecules of methane, ammonia and water are given below .This variation in bond angle is a result of (i) the increasing repulsion between hydrogen atoms as the bond length decreases (ii) the number of non-bonding electron pairs in the molecule (iii) a non-bonding electron pair having a greater repulsive force than a bonding electron pair
A pure dextrorotatory monocarboxylic acid is treated with racemic mixture of an alcohol containing one chiral carbon. The ester formed will be
If one strand of DNA has the sequence ATGCTTGA, the sequence in the complementary strand would be
Which of the following exists as Zwitter ion?
When a beam of light is passed through a colloidal solution it:
Chemical bond implies
Sodium chloride is an ionic compound whereas hydrogen chloride is mainly covalent because
$B(OH)_3$ is a
The paramagnetic property of the oxygen molecule is due to the presence of unpaired electrons present in
Which of the following is not a function of proteins?
Which is/are weaker acid than water?
Which one of the following transition metal ions shows magnetic moment of 5.92 BM?
The following set of reactions are used in refining zirconium. $Zr (impure) + 2I_2$ ${->[523K]}$ $ZrI_4$ ${->[1800K]}$ Zr (pure) +$2I_2$ This method is known as
Which of the following bases is not present in $DNA$ ?
The covalent bond length is the shortest in which one of the following bonds?
The linkage between the two monosaccharide units in lactose is
The average oxidation state of sulphur in $Na_2S_4O_6$ is
Choose the disproportionation reaction among the following redox reactions
When (-)-2-methylbutan-1-ol is heated with concentrated hydrochloric acid, (+) 1-chloro-2-methylbutane is obtained. The reaction is an example of
Which one of the following reagent will convert acetamide to ethanamine?
In the eclipsed conformation of ethane, the dihedral angle between the hydrogen atoms of adjacent methyl groups is
Which one of the following is an essential amino acid?
Which of the following compounds show optical isomerism? (i) $cis-[Co(NH_3)_4Cl_2]^+$ (ii) $trans-[Co(en)_2Cl_2]^+$ (iii) $cis-[Co(en)_2Cl_2]^+$ (iv) $[Co(en)_3]^{3+}$ Choose the correct answer codes given below
Match the following:
List-I List-n (At STP)
(A) $10 \, g \, CaCO_3 \xrightarrow [\text{decomposition}]{\Delta}$ (i) $0.224 \, L \, CO_2$
(B) $1.06 \, g \, Na_2 CO_3 \xrightarrow{\text{Excess HCl}}$ (ii) $4.48 \, L \, CO_2$
(C) $2.4 \, g \, C \xrightarrow [\text{combustion}]{Excess \, O_2}$ (iii) $0.448 \, L \, CO_2$
(D) $0.56 \, g \, CO \xrightarrow [\text{combustion}]{\text{Excess} O_2}$ (iv) $2.24 \, L \, CO_2$
(v) $22.4 \, L \, CO_2$
The correct match is