List of top Chemistry Questions

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 :
The least number of oxyacids are formed by :
Rachel Carson's famous book 'Silent Spring ' is related to
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
Molar enthalpy change for melting of ice is $6\, kJ / mol$. Then the internal energy change (in $k J / mol$ ) when $1$ mole of water is converted into ice at $1$ atm at $0^{\circ} C$ is Empty QImg
Which of the following options represents the correct bond order ?
How does the electron gain enthalpies vary across a period and down a group?
The number of $Na$ atom in $46\, g \,Na$ (atomic weight of $Na= 23$) is
If the solubility of a sparingly soluble salt $AX _{2}$ is $s\, mol / L$, the solubility product is
Among $P, S, Cl, F$, the elements with most negative and least negative electron gain enthalpy respectively, are
The species which cannot serve as an initiator for the free radical polymerisation, is