List of top Chemistry Questions asked in BHU UET

The least stable free radical is
If $N_{0}$ represents Avogadro's number, the number of valence electrons in $4.2 \,g$ of nitride ion $\left( N ^{3-}\right)$ is
The compound that can exhibit geometrical isomerism is
Which of the following acts as a reducing agent to reduce $ W{{O}_{3}},Mo{{O}_{3}} $ and $ Ge{{O}_{2}} $ into metals?
Chlorination of which of the following substance is a substitution reaction?
The process of conversion of ozone into oxygen $\left(2O_{3} \longrightarrow 3O_{2}\right)$ involves following steps $O _{3} {<=>[{\text { Fast }}]} O _{2}+ O$ $O + O _{3} {->[{\text { Slow }}]} 2 O _{2}$ The rate law expression for this process is
Natural rubber is
Dissolution of ammonium chloride in water leads to a cooling sensation. At constant temperature, this process is accompanied by
Consider the following hypothetical reaction. $A+B \rightleftharpoons C+D ; \,\,\,K_{c}=1 \times 10^{-4}$ Which of the following statements is true for this reaction ? In this reaction,
Total number of rare earth elements is
The radioactivity of a sample is $ {{R}_{1}} $ at a time $ {{T}_{1}} $ and $ {{R}_{2}} $ at times $ {{T}_{2}} $ . the half-life of the specimen is $T$, the number of atoms that have disintegrated at the time $ ({{T}_{2}}-{{T}_{1}}) $ is proportional to
The effect of temperature on reaction rate is shown by
The ions $ {{N}^{3-}},{{O}^{2-}},{{F}^{-}},N{{a}^{+}}M{{g}^{2+}} $ are isoelectronic. Their ionic radii show

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion \(He_2\) does not exist. 

Reason Bond order of \(He_2\) is zero.

In the light of the above statements, choose the correct answer from the options given below

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)?
Diagonal relationship is not shown by
$[ CoF_6]^{3-}$ is paramagnetic. $Co^{3+}$ has $3d^6$ outer electronic configuration. The unpaired electrons do not pair up because of weak field provided by $F^-$ .
Which of the following is not true for antibiotics?
Most favourable condition for ionic bonding are
The rate of diffusion of methane at a given temperature is twice that of a gas $X$. The molecular mass of $X$ is
A solution has $ H^{+} $ ion concentration $0.0005\, M$. Its $ pOH $ is
$75 \%$ of a first order reaction was completed in $32\, min$, when was $50 \%$ of the reaction completed?
For a zero order reaction, $A \longrightarrow P, t_{1 / 2}$ is (k is rate constant)
The weight of one molecule of a compound $C _{60} H _{122}$ is