List of top Chemistry Questions asked in NEET (UG)

If $60\%$ of a first order reaction was completed in $60\, min$, $50\%$ of the same reaction would be completed in approximately ($log\, 4 = 0.60 \,log\, 5 = 0.69$)

The reaction of hydrogen an iodine monochloride is given as $H _{2( g )}+2 ICl _{( g )} \rightarrow 2 HCl _{( g )}+ I _{2( g )}$ This reaction is of first order with respect to $H _{2( g )}$ and $ICl _{( g )}$, following mechanisms were proposed Mechanism $A$: $H _{2( g )}+2 ICl _{( g )} \rightarrow 2 HCl _{( g )}+ I _{2( g )}$ Mechanism $B$ : $H _{2( g )}+ ICl _{( g )} \rightarrow HCl _{( g )}+ HI _{( g )} ;$ Slow $HI _{( g )}+ ICl _{( g )} \rightarrow HCl _{( g )}+ I _{2( g )} ;$ Fast Which of the above mechanism $(s)$ can be consistent with the given information about the reaction:

If there is no rotation of plane polarised light by a compound in a specific solvent, though to be chiral, it may mean that

An element, $X$ has the following isotopic composition; ${ }^{200} X : 90 \%$ ${ }^{199} X : 8.0 \%$ ${ }^{202} X : 2.0 \%$ The weighted average atomic mass of the naturally-occurring element $X$ is closest to:

With which of the following electronic configuration of an atom has the lowest ionisation enthalpy?

Identify the correct order of the size of the following.

Which of the following oxidation states are the most characteristics for lead and tin respectively?

The hydrogen ion concentration of a $ 10^{-8}M HCl $ aqueous solution at 298 K $ ( K_w = 10^{-14} ) $ is :-

The appearance of colour in solid alkali metal halides is generally due to :

Which of the following is not isostructural with \(\text{SiCl}_4\) ?

The number of unpaired electrons in a paramagnetic diatomic molecule of an element with atomic number 16 is :

Which of the following is not a correct statement ?

Which of the following is the most basic oxide ?

The IUPAC name of   is :

Ethylene oxide when treated with Grignard reagent yields :

During osmosis, flow of water through a semi-permeable membrane is :

Photochemical smog pollution does not contain:

The electronegativity difference between N and F is greater than that between N and H yet the dipole moment of NH₃ (1.5 D) is larger than that of NF₃ (0.2 D). This is because:

The correct order of the mobility of the alkali metal ions in aqueous solution is

A carbonyl compound reacts with hydrogen cyanide to form cyanohydrin which on hydrolysis forms a racemic mixture of α-hydroxy acid. The carbonyl compound is:

1.00 g of a non-electrolyte solute (molar mass 250 g mol^-1) was dissolved in 51.2 g of benzene. If the freezing point depression constant, K_f of benzene is 5.12 K kg mol^-1, the freezing point of benzene will be lowered by:

Nucleophilic addition reaction will be most favoured in:

[Cr(H₂O)₆]Cl₃ (at. no. of Cr = 24) has a magnetic moment of 3.83 BM, the correct distribution of 3d electrons in the chromium of the complex is:

In which of the following molecules are all the bonds not equal?

Self condensation of two moles of ethyl acetate in presence of sodium ethoxide yields: