List of top Chemistry Questions

The PH value of milk is.

Which of the following diseases is not caused by water pollution?

Treatment of 1-Methylcyclohexene with an ether solution of diborane (B₂H₆), followed by reaction with alkaline H₂O₂ produces which of the following product ?

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: cyanide and phosphorus trifluoride ligands stabilize metals in low oxidation states.
Reason R: Cyanide and phosphorus trifluoride ligands are excellent π-acceptor ligands.
In the light of the above statements, choose the most appropriate answer from the options given below:

The correct statements for second law of thermodynamics is/are
A. Heat does not flow spontaneously from a cool body to a hotter body
B. The entropy of perfectly crystalline substance is zero at 0 K.
C. No process is possible in which the sole result is the absorption of heat from a reservoir and its complete conversion to work.
D. For a spontaneous change ΔS_total > 0
Choose the most appropriate answer from the options given below:

Which of the following complexes are diamagnetic complexes ?

Oxidation state of Sulphur in dithionite and dithionate ions are respectively

Match List I with List II

List I		List II
A.	$∇^2\psi+\frac{8\pi^2m}{h^2}(E-V)\psi=0$	I.	Planck
B.	$E=hv$	II.	Heisenberg
C.	$\Delta x.\Delta p≥\frac{h}{4\pi}$	III.	Schrodinger
D.	$\lambda=\frac{h}{p}$	IV.	de Broglie

Choose the correct answer from the options given below:

Which among the following is wrong statement ?

The energy required for various electronic transitions follow the order

Identify the correct statements applicable to rotational spectroscopy.
A. It lies in the microwave region
B.The molecules must have permanent dipole moment
C. The selection rule is AJ = ±2
D. Only one transition is observed at room temperature.
Choose the correct answer from the options given below:

Calculate the number of moles of carbon mono oxide in the following reaction
CH₃CH₂CHO $\stackrel{hv}{→}$ CH₃CH₃ + CO
If the light irradiated has λ= 3020 A°, the quantum yield of reaction 0.54 and the light energy absorbed is 15000 erg in a given time.

The first order diffraction from (110) plane of KCl observed using X-ray of wavelength 150 pm and edge length of unit cell is 305 pm, then glancing angle is equal to -
[sin 20.35° = 0.3478
sin 38.35° = 0.6205
 sin 40.35° = 0.6475
 sin 18.35° = 0.3148]

Which of the following form square planar complexes
A. [AuCl₄]
B. [RhCl(PPh₃)₃]
C. [NiBr₄]^2-
D. [FeCl₄]^2-
Choose the correct option :

A liquid having molar mass of 50 g mol^-1 boils at 80°C. If the latent heat of vapourization is 500 cal g^-1, the molar entropy of vapourization is

Given below are two statements:
Statement I: The conversion of diamond to graphite at room temperature and pressure is spontaneous (ΔG=-2.90 kJ mol^-1)
Statement II: The electrical conductivity of graphite perpendicular to the plane is low, whereas parallel to the plane is very high.
In the light of the above statements, choose the most appropriate answer from the options given below:

The decomposition of CaCO3 in a closed vessel is represented by the equation
CaCO₃ ⇌ (s) CaO (s) + CO₂ (g)
Calculate the number of phases, components and degree of freedom

At 20°C pure water requires 102.2 seconds to flow through the capillary of an Ostwald Viscometer while toluene at 20°C requires 68.9 seconds. Calculate the relative viscocity of the toluene. Densities of water and toluene are 0.998 and 0.866 g cm^-3 respectively.

Which one of the following compounds on reaction with two moles of Grignard reagent followed by acidic hydrolysis does not give tertiary alcohol ?

The dissociation constant of bromocresol purple indicator is 3.981 × 10^-7 at 0° C. The indicator when added to a buffer solution gave a colour matched with 50% basic colour and rest matched with acidic colour. The pH of buffer is:
[log 3.98 = 0.5999]

The type of isomerism displayed in following pair of compounds is
[Co(NH₃)₆] [Cr(C₂O₄)₃] and [Cr(NH₃)₆] [Co(C₂O₄)₃]

Which of the following statement is not correct regarding five membered heterocyclic compounds?

A nitrogen containing compound dissolves in 10% aq. sulphuric acid. The Hinsberg test gives a solid product that is not soluble in 10% aq. NaOH. Which one of the following compounds best fits the above facts?

How many elements are there in period 4 of the periodic table?

The reaction of 4-methyloct-1-ene (P, 2.52 g) with HBr in the presence of (C₆H₅CO)₂O₂ gives two isomeric bromides in a 9 : 1 ratio, with a combined yield of 50%. Of these, the entire amount of the primary alkyl bromide was reacted with an appropriate amount of diethylamine followed by treatment with aq. K₂CO₃ to give a non-ionic product S in 100% yield. The mass (in mg) of S obtained is ___. [Use molar mass (in g mol^–1): H = 1, C = 12, N = 14, Br = 80]