List of top Chemistry Questions

The molar conductivities at infinite dilution for Na2SO4,K2S04,KCl, HCl and HCOONa at 300K are 260, 308, 150, 426, and 105 S cm2 mol-1, respectively. What will be A+m for formic acid in the same unit?

Compound A from the following reaction sequence is 
Br2 , C S 2 0 − 5 ° C 0 − 5 ° 𝐶 → 𝐵 𝑟 2 , 𝐶 𝑆 2 B. N a N O 2 / H C l
The wave function $(\Psi)$ of $2 s$ is given by $\Psi_{2 n }=\frac{1}{2 \sqrt{2 \pi}}\left(\frac{1}{a_0}\right)^{1 / 2}\left(2-\frac{r}{a_0}\right) e^{-\frac{r}{2 a_0}}$ At $r=r_0$, radial node is formed Thus, $r_0$ in terms of $a_0$
Number of compounds giving (i) red colouration with ceric ammonium nitrate and also (ii) positive iodoform test from the following is_____
Structure
1 L, 0.02 M solution of [Co(NH3)5 SO4]Br is mixed with 1 L, 0.02 M solution of [Co(NH3)5Br]SO4.  The resulting solution is divided into two equal parts (X) and treated with excess of AgNO3 solution and BaCl2 solution respectively as shown below:
1 L Solution (X) + AgNO3 solution (excess) →  Y  
1 L Solution (X) + BaCl2 solution (excess) → Z
The number of moles of Y and Z respectively are

Which one amongst the following are good oxidizing agents?
(A) \( \text{Sm}^{\text{2+}}\)
(B) \(\text{Ce}^{\text{2+}}\)
(C)\( \text{Ce}^{\text{4+}}\)
(D) \(\text{Tb}^{\text{4+}}\)
Choose the most appropriate answer from the options given below:

The separation of two coloured substances was done by paper chromatography The distances travelled by solvent front, substance $A$ and substance $B$ from the base line are $3.25\, cm.  2.08 \, cm$ and $1.05\, cm$ respectively. The ratio of $R_f$ values of $A$ to $B$ is _______

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason $R$ : 

Assertion (A) : Acetal / Ketal is stable in basic medium.

Reason (R) : The high leaving tendency of alkoxide ion gives the stability to acetal ketal in basic medium

In the light of the above statements, choose the correct answer from the options given below

Match List I with List II 

List IList II
AIFittig reaction
BIIWurtz Fittig reaction
CIIIFinkelstein reaction
D\(C_{2}H_{5}CI + NaI \rightarrow C_{2}H_{5}I + NaCl\)IVSandmeyer reaction

 Choose the correct answer from the options given below:

Which of the following statements is correct about freons?
Which one of the following reactions does not occur during extraction of copper?

Which one of the following statements is correct for electrolysis of brine solution?

A cubic solid is made up of two elements $X$ and $Y$ Atoms of $X$ are present on every alternate corner and one at the center of cube $Y$ is at $\frac{1}{3} rd$ of the total faces. The empirical formula of the compound is

If the CFSE of $\left[ Ti \left( H _2 O \right)_6\right]^{3+}$ is $-960 kJ / mol$, this complex will absorb maximum at wavelength ___$nm$ (nearest integer) Assume Planck's constant $( h )=64 \times 10^{-34} Js$, Speed of light $( c )=30 \times 10^8 m / s$ and Avogadro's Constant $\left( N _{ A }\right)=6 \times 10^{23} / mol$

Arrange the following elements in increasing order of their electronegativity according to the Pauling scale
C, Na, Be and Br
Match the molecules in Group I with the type of bonds present in them, in Group II
Group I Group II
P) NaCl 1) Coordination bond
Q) $H_2$2) Polar covalent bond
R) $Pd-P$ bond in $Pd(PPh_3)_4 3) Covalent bond
S) $C-Cl$ bond in $CH_3Cl $ 4) Ionic bond
What is the splitting pattern of proton $H^{a}$ of the following compound in its $^1H NMR$ spectrum?
What is the splitting pattern of proton Ha of the following compound in its 1H NMR spectrum?
Which of the following compound(s) is/are aromatic?
Which of the following statement(s) is/are correct for the following compound?
Which of the following statement(s) is/are correct for the following compound?
Among $i-BuNH_2, NH_3, Me_2NH, EtNH_2,$ the number of compound(s) more basic than $MeNH_2$ is/are ______.
Among $K^+, Li^+, Rb^+, Cs^+$, the number of cation(s) having ionic radii more than $Na^+$ is/are _____.
Among the five fragments given below, <br> the number of fragment(s) accelerated to the analyzer tube in mass spectrometer with electron ionization is/are _________.
Among the five fragments given below, <br> the number of fragment(s) accelerated to the analyzer tube in mass spectrometer with electron ionization is/are _________.
A protein solution of 1 µM has transmission of 40 % at 280 nm, when measured in a 1 cm cuvette using a UV-Visible spectrophotometer. The transmission of the same solution, when measured using a 2 cm cuvette is ______ %. (rounded off to the nearest integer)
Consider a first order reaction 𝐴 → 𝐵. The initial concentration of 𝐴 is $100 mol L^{-1}$ and the value of first order rate constant is 0.01 $min^{-1}$. The concentration of 𝐴 after 10 min of reaction is ____ $ mol L^{-1}$ (rounded off to one decimal place).

Among [I3] + , [SiO4]4-, SO2Cl2, XeF2, SF4, ClF3, Ni(CO)4, XeO2F2, [PtCl4] 2−, XeF4, and SOCl2, the total number of species having sp3 hybridised central atom is ______.