List of top Chemistry Questions

Helium molecule is monoatomic because
For $O_2$ molecule, molecular orbitals having lowest energy is
What is wrong about $CO_3^{2-} \, ion ?$
Consider the acidity of the carboxylic acids (i) PhCOOH (ii) $o-NO_2C_6H_4COOH$ (iii) $p-NO_2C_6H_4COOH$ (iv) $m-NO_2C_6H_4COOH$ Which of the following orders is correct?
The number of hydrogen bonds between adenine and thymine in a DNA molecule is
Which one of the following elements does not form the compound, $ {{M}_{4}}{{O}_{10}} $ (M = element)?
$[ CoF_6]^{3-}$ is paramagnetic. $Co^{3+}$ has $3d^6$ outer electronic configuration. The unpaired electrons do not pair up because of weak field provided by $F^-$ .
Diagonal relationship is not shown by
Which of the following is not true for antibiotics?
Which one of the following pairs is obtained on heating ammonium dichromate?
Which of the following expressions gives the de-Broglie relationship?
Which of the following acids has the smallest dissociation constant?
When $KI$ is added to acidified solution of sodium nitrite, then
Surface tension vanishes at
Distillation of acetone with concentrated sulphuric acid gives
Which of the following is used as an antibiotic?
Which of the following false for tetrahedral complexes?
the reagents used in the conversion are
Which of the following has highest ionisation energy?
An element with configuration $1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{5}$ will form a compound of highest ionic character with the element having configuration
In the following reaction $NH _{4}^{+}+ BiN \rightarrow NH _{3}+ Bi ^{3+} NH _{4}^{+}$ is acting as an
In the given compound which of the following hydrogens is most acidic? $\underset{(a)}{CH_3} -\underset{(b)}{CH_2} -\overset{\underset{||}{O}}{C} -\underset{(c)}{CH_3}$
In the following complex compound $\left[ Co \left( NH _{3}\right)_{4} Cl _{2}\right]^{+}$, Co and $Cl$ are collinear. Which of the following structures is possible?
The following solids are formed by $X,\, Q$ and $Z.\, XY_{2},\,X_{2}Z,\,QZ$ . Then the formula of the compound formed by $Q$ and $Y$ is
Identify $B$ in the following reaction