List of top Chemistry Questions asked in AIIMS

When pressure is increased at constant temperature
The vapour pressure of a liquid decreases if some non-volatile solute is dissolved in it. The relative lowering of vapour pressure of a solution containing a non-volatile solute is equal to the mole fraction of the solute in the solution.
One mole of NaCl contains 6.023 ??10 formula units of sodium chloride. 58.5 g of NaCl also contains 6.023 ??10 formula units of NaCl.
Which of the following is the correct order of acidic strength of the following compounds?
Ortho-nitrophenol is more acidic than meta-nitrophenol. Ortho-nitrophenol has $more-I-effect$ than meta-nitrophenol.
Glycerol is purified by distillation under reduced pressure. Organic compounds in liquid state are purified by distillation.
When $CH_3COOCH_3 + HCl$ is titrated with $NaOH$ then at neutral point the colour of phenolphthalein becomes colourless from pink due to
In the given reaction : $A + 2B \rightleftharpoons 2C$ moles each of A and B present in 10 L of solution combine to form 1 mole of C. Calculate $K_c$ for the reaction.
Which of the following is correct regarding bond angles? (i) $SO_2 < H_2O$ $\quad\quad$ (ii) $H_2S < SO_2$ (iii) $SO_2 < H_2S \quad\quad (iv) SbH_3 < NO_2^+$
Which of the following pairs have different hybridisation and same shape? (i) $NO_3^-$ and $CO_3^{2-} $$\quad\quad$ (ii) $SO_2$ and $NH_2^-$ (iii) $XeF_2$ and $CO_2$ $\quad\quad$ (iv) $H_2O$ and $NH_3$
Which process is used in smelting during metallurgy of copper?
What colour is observed when $ZnO$ is heated?
Wavelength of a particular transition for $H\, atom$ is $400 \,nm$. What can be the wavelength of $He^+$ for the same transition?
Two separate bulbs contain gas A and gas B. The density of gas A is twice as that of B. The molecular mass of A is half as that of B. If temperature is constant, the ratio of the pressure of A and B is
The normality of 10% $H_2SO_4$ solution having density 1.1 g/cc is
The correct order of reactivity in S1 reaction for the following compounds is
$KMnO_4$ on reaction with KOH does not give
In van der Waals equation at constant temperature 300 K, if a = 1.4 atm L mol, V = 100 mL, n = 1 mole, then what is the pressure of the gas?
In acidic medium, which of the following becomes colourless?
Gas in a cylinder is maintained at $10 \,atm$ pressure and $300\, K$ temperature. The cylinder will explode if pressure of gas goes beyond $15\, atm$. What is the maximum temperature to which gas can be heated?
F-centre is
Zone refining is based on the solubility of impurities in the molten state than in the solid state of the metal. Pure metal oxide is obtained in zone refining.
$Si??i$ bonds are much stronger than $Si??$ bonds. Silicon forms double bonds with itself.
$Pb_3O_4$ reacts with $HNO_3$ and forms $PbO_2$. Lead is stable in $+4$ oxidation state.
Oxidation state of hydrogen is +1 in $H_2O$ while -1 in $CaH_2$. $CaH_2$ is a metal hydride and for hydrides, hydrogen is assigned the oxidation number of -1.