List of top Chemistry Questions

Which of the following is not a broad spectrum antibiotics ?
The non-essential amino acid among the following is:
Among the following, the narrow spectrum antibiotic is :
The molar solubility of CaF$_2$ (K$_{sp}$ = 5.3 × 10$^{-11}$) in 0.1 M solution of NaF will be
A compound is formed by cation C and anion A. The anions form hexagonal close packed (hep) lattice and the cations occupy 75% of octahedral voids. The formula of the compound is :
The pH of 0.01 M NaOH (aq) solution will be
Among the following, the one that is not a green house gas is :
The most stable carbocation, among the following is :-
The oxidation state of Cr in CrO6 is :
A water sample has ppm level concentration of the following metals: $Fe = 0.2; Mn = 5.0; Cu = 3.0; Zn = 5.0.$ The metal that makes the water sample unsuitable drinking is
Propene when treated with cold conc. $H_{2}SO_{4}$ forms a compound which on heating with water gives
The correct sequence of thermal stability of the following carbonates is
The ore that contains both iron and copper is:
The amorphous form of silica is :
Two pi and half sigma bonds are present in:
Noradrenaline is a /an
The correct order of the oxidation states of nitrogen in $NO, N_2O, NO_2$ and $N_2 O_3$ is :
The increasing order of nucleophilicity of the following nucleophiles is : (a) ${CH_3CO^{\ominus}_2}$ (b) ${H_2O} $ (c) ${CH_3SO^{\ominus}_3}$ (d) ${O^{\ominus}H}$
One mole of an ideal gas passes through a process where pressure and volume obey the relation $P =P_{o} \left[1- \frac{1}{2} \left(\frac{V_{0}}{V}\right)^{2}\right] $ .Here $P_o$ and $V_o$ are constants. Calculate the change in the temperature of the gas if its volume changes from $V_o$ to $2 V_o$ .
The correct statement among the following is
The artificial sweetner stable at cooking temperature and does not provide calories is :
Diborane ${(B2H6)}$ reacts independently with ${O_2}$ and ${H2O}$ to produce, respectively
Among the following molecules / ions, $C^{2-}_{2}, N^{2-}_{2}, O^{2-}_{2}, O_{2}$ which one is diamagnetic and has the shortest bond length?
The major product formed in the following reaction is:
Correct statements among $a$ to $d$ regarding silicones are : (a) They are polymers with hydrophobic character (b) They are biocompatible. (c) In general, they have high thermal stability and low dielectric strenth. (d) Usually, they are resistant to oxidation and used as greases.