List of top Questions asked in NEET (UG)

An unknown nucleus has a nuclear density of 2.29 $\times$ 10¹⁷ kg/m³ and mass of 19.926 $\times$ 10⁻²⁷ kg. Its mass number A is approximately: (Take $R_0 = 1.2 \times 10^{-15}$ m, $4\pi = 12.56$)

In the circuit shown below, the voltage appearing across the diode D will be of the form: ____.

Choose the correct statements regarding frog's anatomy.
A. Hepatic portal system is the special venous connection between liver and intestine.
B. There are twelve pairs of cranial nerves arising from the brain.
C. The ureters and oviducts open separately into the cloaca in female frogs.
D. Hind-brain consists of cerebellum, medulla oblongata and optic lobes.
E. Sinus venosus joins the right atrium of heart.
Choose the correct answer from the options given below:

When $1\ dm^3$ of $CO_2$ gas is passed over hot coke, the volume of gaseous mixture after complete reaction at STP becomes $1.4\ dm^3$. The composition of the gaseous mixture at STP is:

A room heater is rated 400 W, 220 V. If the supply voltage drops to 200 V, what will be the power consumed (approximately)? ____.

The magnitude and direction of the acceleration produced in a body of mass 5 kg when two mutually perpendicular forces 8 N and 6 N act on it, are respectively:

The number of hydrogen atoms present in $5.4\text{ g}$ of urea is: \[ \text{Given: Molar mass of urea }=60\text{ g mol}^{-1} \] \[ N_A=6.022\times10^{23}\text{ particles mol}^{-1} \]

The major product Z formed in the following sequence of reactions is:

$$ {C2H5Cl →[AgNO2] X →[Sn/HCl] Y →[(i)\ NaNO2][(ii)\ HCl,\ H2O] Z} $$

The following two reactions give the same foul smelling product $Z$:

\[ {C2H5CONH2 →[Br2/NaOH] X} \] \[ {X →[CHCl3/alcoholic\ KOH][\Delta] Z} \] $X$ and $Z$, respectively, are:

Calculate emf of the half-cell given below: \[ Pt(s)\mid H_2(g,2\text{ atm})\mid HCl(aq,0.02M) \] \[ E^\circ_{H^+/H_2}=0V,\qquad \frac{2.303RT}{F}=0.059 \] \[ \log 2=0.3010 \]

Match List-I with List-II. List-I contains quantum numbers and List-II contains orbitals.

List-I	n	l
A	2	1
B	4	0
C	5	3
D	3	2

List-II	Orbital
I	3d
II	2p
III	4s
IV	5f

Methane reacts with steam at $1273K$ in the presence of nickel catalyst to form:

Compound $P$ gives a red-orange precipitate with 2,4-DNP reagent and does not reduce Fehling's reagent. On drastic oxidation with chromic acid, $P$ gives an aromatic product $Q$ which produces effervescence on treating with aqueous $\ce{NaHCO3}$. Compounds $P$ and $Q$, respectively, are:

In the following reaction sequence, $X$ and $Z$, respectively, are: \[ {CH3CH2CH2OH →[PCl5] CH3CH2CH2Cl + X + HCl} \] \[ {CH3CH2CH2Cl →[alc.\ KOH][\Delta] Y →[HBr] Z} \]

The correct IUPAC name of the following compound is: \[ {CH3-CH2-CH(CH3)-CH2-CH(CH3)-CH2-CH3} \]

The pair of molecules that are isomers among the following is:

Identify the correct statement about $ClF_3$.

A solution of copper sulphate is electrolysed for $10$ minutes with a current of $1.5$ ampere. The mass of copper deposited at the cathode is: \[ \text{Given: Molar mass of Cu}=63.5\text{ g mol}^{-1} \] \[ F=96487\text{ C mol}^{-1} \]

Match List-I with List-II.

List-I	Order of reaction
A	Zero order
B	First order
C	Second order
D	Third order

List-II	Unit of rate constant
I	mol⁻¹ L s⁻¹
II	mol⁻² L² s⁻¹
III	s⁻¹
IV	mol L⁻¹ s⁻¹

The correct statement with regard to the secondary structure of DNA/RNA is:

At $298K$, a certain buffer solution contains equal concentrations of $X^-$ and $HX$. If $K_b$ for $X^-$ is $10^{-10}$, what is the pH of this buffer solution?

For a certain reaction $R\rightarrow$ Product, the plot of concentration $[R]$ versus time has a negative slope as shown. The order of reaction is:

The correct formal charges on oxygen atoms numbered $2,1$ and $3$, respectively, are:

Match List-I with List-II.

List-I	Transition metal/compound
A	V₂O₅
B	Fe
C	PdCl₂
D	Ni complex

List-II	Catalytic role
I	Preparation of ammonia from N₂/H₂ mixture
II	Polymerisation of alkynes
III	Oxidation of SO₂ to SO₃
IV	Preparation of ethyne to ethene

Identify the incorrect statement from the following: