List of top Chemistry Questions

Which of the following is not an electron withdrawing group?
The isomerism exhibited by the octahedral complex $[\mathrm{Co(NH_3)_4Br_2}]Cl$ is:
The IUPAC name of $[\mathrm{Fe(CO)_5}]$ is:
The correct order of ionic radii of Ce, La, Pm and Yb in \( +3 \) oxidation state is
Which of the following statement is INCORRECT?
\(CrO_3\) is a/an
Which of the following outermost electronic configuration of the element shows the highest oxidation state?
Which of the following is a zero order reaction?
The first order rate constant for the decomposition of \( \text{N}_2\text{O}_5 \) is \( 6.93 \times 10^{-4}\, \text{sec}^{-1} \). Its half-life period is
The osmotic pressure of \( 0.01\,M \) aqueous solution of urea at \( 300\,K \) is \((R = 0.082\,\text{lit atm mol}^{-1}\text{K}^{-1})\)
Which of the following statement is true for the electrochemical, Daniel cell?
Which of the following statement is INCORRECT for the concept of oxidation?
The question text is cut off in the image, so the full data for this question is not visible. Only the ending part
“\(\dots\) mole of \(CH_3COONa\). The \([H^+]\) in the resultant solution is”
and the given value
\[ K_a(CH_3COOH)=1.1\times 10^{-5} \] are visible. Therefore, the complete numerical information needed to solve this question is missing.
The pH of a solution is \( 4 \) then its \( \text{OH}^- \) ion concentration (in mol dm\(^{-3}\)) is
Given: $\Delta_r H^{+}(\text{Ag}^+)=105.6\ \text{kJ mol}^{-1}$, $\Delta_r H^{+}(\text{Cl}^-)=-167.2\ \text{kJ mol}^{-1}$, and $\Delta_r H^{+}(\text{AgCl})=-127.1\ \text{kJ mol}^{-1}$, find the value of $\Delta_r H$.
Types of system and their definitions are given below. Choose the correct match from the following codes:
System:
(a) Closed system
(b) Open system
(c) Isolated system
(d) Homogeneous system
(e) Heterogeneous system
Definition:
(i) A system which can exchange both energy and matter with surrounding
(ii) A system which cannot exchange matter or energy with surrounding
(iii) A system consisting of single phase
(iv) A system consisting of many phases
(v) A system which can exchange only energy with surrounding
Which of the following molecule has zero dipole moment?
Which of the following statement is INCORRECT with p-block elements?
Which of the following statement is NOT true with Bohr's model of atom?
When the uncertainty in momentum is zero then the uncertainty in the position of a particle is
Which of the following has the highest molar mass? \((\text{Atomic masses: N}=14,\ \text{O}=16,\ \text{Ag}=108,\ \text{Pb}=208,\ \text{Na}=23,\ \text{H}=1,\ \text{K}=39)\)
Above the threshold frequency, if the intensity of incident light falling on a photo sensitive material is increased, then the correct statement is:
Global warming leads to
Which is the correct IUPAC name for
$\text{CH}_3$
The pyrimidine bases present in DNA are: