List of top Chemistry Questions

Consider the following changes $M(s) \longrightarrow M(g)$ $M(g) \longrightarrow M^{2+}(g)+2 e^{-}\ldots$(1) $M(g) \longrightarrow M^{+}(g)+e^{-}\ldots$(2) $M^{+}(g) \longrightarrow M^{2+}(g)+e^{-} \ldots$ (3) $M(g) \longrightarrow M^{2+}(g)+2 e^{-}\ldots$(4) The second ionisation energy of $M$ could be determined from the energy values associated with
Consider the water gas equilibrium reaction, $C ( s )+ H _{2} O ( g ) \rightleftharpoons CO ( g )+ H _{2}( g )$ Which of the following statements is true at equilibrium?
A certain metal when irradiated by light $(r = 3.2 \times 10^{16} Hz)$ emits photoelectrons with twice kinetic energy as did photoelectrons when the same metal is irradiated by light $(r =2.0 \times 10^{16} Hz)$. The $v_0$ of metal is
Which of the statements given below is incorrect ?
On heating which of the following releases ${CO_2}$ most easily ?
Reaction of carbonyl compound with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is :
The boiling point of 0.2 mol kg$^{-1}$ solution of X in water is greater than equimolal solution of Y in water. Which one of the following statements is true in this case ?
The correct bond order in the following species is :
The angular momentum of electron in 'd' orbtial is equal to
Permanent hardness in water cannot be cured by :
Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy?
Solubility of the alkaline earth?? metal sulphates in water decreases in the sequence :
The reaction is called :
What is the mass of the precipitate formed when 50 mL of 16.9% solution of $AgNO_3$ is mixed with 50 mL of 5.8% $NaCl$ solution ? (Ag = 107.8, N = 14, O = 16, Na = 23, Cl =35.5)
Which physical property of dihydrogen is wrong ?
Chlorine water on standing loses its colour and forms :
Addition of phosphate fertilisers to water bodies causes :
In the long form of the periodic table, the valence shell electronic configuration of $5s^2 5p^4$ corresponds to the element present in :
Rachel Carson's famous book 'Silent Spring ' is related to
The least number of oxyacids are formed by :
Which of the following pairs of ions are isoelectronic and isostructural ?
An alloy of copper, silver and gold is found to have copper atom constituting the ccp lattice. If silver atom occupy the edge centres and gold atom is present at body centred, the alloy has a formula
A mixture of methylamine and dimethylamine is given to you. The reagents used to separate the components of the mixture are
The distinguishing test between methanoic acid and ethanoic acid is
Half-life period of a first order reaction is $10\, min$. Starting with initial concentration $12\, M$, the rate after $20\, min$ is