List of top Chemistry Questions asked in JCECE

The molecule which has zero dipole moment is
Identify Z in the sequence $ C{{H}_{3}}COON{{H}_{4}}\xrightarrow{\Delta }X\xrightarrow[\Delta ]{{{P}_{2}}{{O}_{5}}}Y\xrightarrow{{{H}_{2}}O/{{H}^{+}}}Z $
Most stable carbonium ion is
A solution contains 10 mL 0.1 N NaOH and 10 mL $0.05 NH_2SO_4 $,PH of this solution is
$[Sc(H_2O)_6 ]^{3+}$ ion is
Which one has the highest boiling point?
Producer gas is the mixture of
In aqueous solutions, the basic strength of amines decreases in the order
Which of the following is the predominant product in the reaction of $ \text{HOBr} $ with propene?
Non-zero dipole moment is shown by
What is the freezing point of a solution containing $ \text{8}\text{.1 g HBr} $ in 100 g water assuming the acid to be 90% ionised? ( $ {{k}_{f}} $ for water $ =1.86\,\text{K}\,\text{mo}{{\text{l}}^{-1}} $ )
Producer gas is the mixture of :
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
Two cells each of same emf e but of internal resistances $ r_1 $ and $ r_2 $ are connected in series through an external resistance R. If the potential difference between the ends of the first cell is zero, what will be the value of R in terms of $ r_1 $ and $ r_2 $ ?
Which one of the following aqueous solutions will exhibit highest boiling point?
The enthalpies of combustion of carbon and carbon monoxide are $ -393.5 $ and $ -283\,\text{kJ}\,\text{mo}{{\text{l}}^{-1}} $ respectively. The enthalpy of formation of carbon monoxide per mol is
What is the equilibrium expression for the reaction, $ {{P}_{4}}(s)+5{{O}_{2}}(g) \rightleftharpoons {{P}_{4}}{{O}_{10}}(s)? $
Which among the following factors is the most important in making fluorine the strongest oxidising agent?
1.520 g of hydroxide of a metal on ignition gave 0.995 g of its oxide. The equivalent weight of the metal 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?
An aqueous solution of 6.3 g of oxalic acid dihydrate is made upto 250 mL. The volume of $ \text{0}\text{.1}\,\text{N}\,\text{NaOH} $ required to completely neutralize 10 mL of this solution is