List of top Chemistry Questions

A solution containing $2.675\, g$ of $CoCl_3. 6\, NH_3$ (molar mass $= 267.5\, g\, mol^{-1}$) is passed through a cation exchanger. The chloride ions obtained in solution were treated with excess of $AgNO_3$ to give $4.78\, g$ of $AgCl$ (molar mass $= 143.5 \,g \,mol^{-1}$). The formula of the complex is (At. Mass of Ag = 108 u)
Chemical formula of phosgene is
At room temperature, the eclipsed and staggered forms of ethane cannot be isolated because
If the supply of oxygen is limited, $ H_{2}S $ reacts with $ O_{2} $ to form
At a certain temperature, the first order rate constant, $k_{1}$ is found to be smaller than the second order rate constant, $k_{2}$. If the energy of activation, $E_{1}$ of the first order reaction is greater than energy of activation, $E_{2}$ of the second order reaction then with increase in temperature
The Brownian motion is due to
For a first-order reaction $A \rightarrow B$ the plot of $\log \left\{[A]_{t} / 1 M \right\}$ versus $t$ is linear with a
$\left[ CoCl _{2}\left( NH _{3}\right)_{4}\right]^{+}+ Cl ^{-} \longrightarrow \left[ CoCl _{3}\left( NH _{3}\right)_{3}\right]+ NH _{3}$ In the reaction only one isomer of complex product is obtained. The initial complex is
$MnO _{4}^{-}$is of intense pink colour, though $Mn$ is in $+7$ oxidation state. It is due to
Consider the sequence of oxides : $Na _{2} O , SiO _{2}$, $P _{4} O _{10}$. Which factor decreases from $Na _{2} O$ to $SiO _{2}$ and also from $SiO _{2}$ to $P _{4} O _{10}$ ?
Which element belongs to $4n$ series?
$0.037\, g$ of an alcohol, $R$-OH was added to $C _{2} H _{5} MgI$ and the gas evolved measured $11.2\, cc$ at STP. The molecular mass of $R- OH$ will be
Which of the following is not a mineral of iron?
Which among the following noble gases is not found in air?
A solid melts slightly above 273 K and is a poor conduct or of heat and electricity. To which of the following categories does it belong ?
The order of a reaction with rate equal to $kC_A^{3/2} C_B^{-1/2}$ is
The chemical name of vitamin $B_{1}$ is
The $AsF_5$ molecule is trigonal bipyramidal. The hybrid orbitals used by the As atoms for bonding are
The most reactive compound towards formation of cyanohydrin on treatment with HCN followed by acidification is
Which of the following has a regular geometry?
Which of the following is a trisaccharide ?
Which of the following is most abundant in the earth's crust ?
The type of teeth present in humans is
In Periodic Table, the basic character of oxides
Fehling $A$ and Fehling $B$ are