List of top Questions asked in NEET (UG)- 2019

An electron is accelerated through a potential difference of \(10,000 V\). Its de Broglie wavelength is, (nearly): \((m_e=9\times10^{-31} kg) \)

For a p-type semiconductor, which of the following statements is true?

Which colour of the light has the longest wavelength?

Pick the wrong answer in the context with rainbow.

A small hole of area of cross-section \(2 mm^2\) is present near the bottom of a fully filled open tank of height \(2 m\). Taking \(g=10 m/s2\), the rate of flow of water through the open hole would be nearly:

a-particle consists of:

A gas at 350 K and 15 bar has molar volume 20 percent smaller than that for an ideal gas under the same conditions. The correct option about the gas and its compressibility factor (Z) is:

The correct order of the basic strength of methyl substituted amines in aqueous solution is:

Match LIST I with LIST II

LIST I		LIST II
A	Pure nitrogen	I	Chlorine
B	Haber process	II	Sulphuric acid
C	Contact process	III	Ammonia
D	Deacon's process	IV	Sodium azide or Barium azide

Which of the following is the correct option?

The non-essential amino acid among the following is:

The biodegradable polymer is:

The structure of intermediate A in the following reaction, is;

For the chemical reaction \(N_2(g)+ 3H_2(g)= 2NH_3(g)\) the correct option is :

Which of the following species is not stable ?

A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% of octahedral voids. The formula of the compound is :

The mixture that forma maximum boiling azeotrope is :

Which one is malachite from the following?

The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber's process is

For the cell reaction
\(2Fe^{3+}+2I^{-}_{(aq)}\rightarrow2Fe^{2+}+I_2{(aq)}\)
\(E^{\ominus}_{cell}=0.24\ V \ at \ 298 k.\)The standard Gibbs energy \((\Delta_rG^{\ominus})\) of the cell reaction is:
[Given that Faraday constant \( F=96500 \ C\ mol^{-1}]\)  

An alkene \("A"\) on reaction with \(O_3\) and \(Zn - H_2{0}\) given propanone and ethanol in equimolar ratio. Addition of \(HCI\) to alkene \("A"\) gives. \("B"\)as the major product. The structure of product \("B"\) is : 

The correct structure of tribromooctaoxide is:

Among the following, the reaction that proceeds through an electrophilic substitution, is:

In which case change in entropy is negative? (1)(2) (3 (4)

The compound that is most difficult to protonate is:

\(pH\) of a saturated solution of \(Ca(OH)_2\) is \(9\). The solubility product \((K_{sp})\) of \( Ca(OH)_2\) is: