List of top Chemistry Questions

Reaction of \(BeCl_2\) with \(LiAlH_4\) gives :
  1. \(AlCl_3\)
  2. \(BeH_2\)
  3. \(LiH\)
  4. \(LiCl\)
  5. \(BeAlH_4\)
Choose the correct answer from the options given below :

Identify the major product formed in the following sequence of reactions:

Which of the following compounds is not aromatic?
Hydrogen has three isotopes: protium (1H), deuterium (2H or D) and tritium (3H or T). They have nearly same chemical properties but different physical properties. They differ in

Match List-I with List-II.

List-I (Metal)List-II (Application)
(A) Cs (I) High temperature thermometer
(B) Ga (II) Water repellent sprays
(C) B (III) Photoelectric cells
(D) Si (IV) Bullet proof vest

Choose the most appropriate answer from the options given below:

Choose the correct stability order of group 13 elements in their +1 oxidation state
Amongst FeCl3.3H2O, K3[Fe(CN)6)] and [Co(NH3)6]Cl3, the spin-only magnetic moment value of the inner-orbital complex that absorbs light at shortest wavelength is_______B.M. [nearest integer]
Sugar moiety in DNA and RNA molecules, respectively are
How many of the following drugs is/are examples(s) of broad-spectrum antibiotics?
Ofloxacin, Penicillin G, Terpineol, Salvarsan.
The spin-only magnetic moment value of an octahedral complex among \(CoCl_3⋅4NH_3\), \(NiCl_2⋅6H_2O\) and \(PtCl_4⋅2HCl\), which upon reaction with excess of \(AgNO_3\) gives 2 moles of \(AgCl\) is _____ B.M. (Nearest Integer)
The oxidation state of manganese in the product obtained in a reaction of potassium permanganate and hydrogen peroxide in basic medium is____.
20 mL of 0.02 M K2Cr2O7 solution is used for the titration of 10 mL of Fe2+ solution in the acidic medium. The molarity of Fe2+ solution is ______×10–2 M. (Nearest integer)

A dilute solution of sulphuric acid is electrolysed using a current of 0.10 A for 2 hours to produce hydrogen and oxygen gas. The total volume of gases produced at STP is ____ cm3. (Nearest integer) 

[Given : Faraday constant F = 96500 C mol–1 at STP, molar volume of an ideal gas is 22.7 L mol–1]

Which oxoacid of phosphorous has the highest number of oxygen atoms present in its chemical formula?

Match List I with List II.
 

List-IList-II
A. Benzene sulphonyl chlorideI. Test for primary amines
B. Hoffmann bromamide reactionII. Anti Saytzeff
C. Carbylamine reactionIII. Hinsberg reagent
D. Hoffmann orientationIV. Known reaction of Isocyamates

Choose the correct answer from the options given below:

The major product (P) of the given reaction is (where, Me is –CH3)

Fig. 
For complete combustion of methanol
\( CH_3OH(I)+\frac 32O_2(g)→CO_2(g)+2H_2O(I)\)
the amount of heat produced as measured by bomb calorimeter is \(726\) kJ mol–1 at \(27°C\). The enthalpy of combustion for the reaction is \(x \ kJ mol^{–1}\), where \(x\) is ______ . (Nearest integer)
(Given: \(R= 8.3 \ JK^{–1}mol^{–1}\))
In metallurgy the term “gangue” is used for :

Match the List I  with List II

List I

 

List II

AIAnti-depressant
BII550 times sweeter than cane sugar
CIIINarcotic analgesic
DIVAntiseptic

Choose the correct answer from the options given below:

A sugar ‘X’ dehydrates very slowly under acidic conditions to give furfural which on further reaction with resorcinol gives the coloured product after some time. Sugar ‘X’ is
sugar ‘X’ dehydrates very slowly under acidic condition
For the below given cyclic hemiacetal (X), the correct pyranose structure is :
cyclic hemiacetal (X)
Match List-I with List-I
List-I List II
A. Phenol-formaldehyde resinIGlyptal
B. The copolymer of 1,3-butadiene and styreneIINovolac
C.Polyester of glycol and phthalic acidIIIBuna-S
D.Polyester of glycol and terephthalic acidIVDacron
Choose the correct answer from the option given below:
Among the following marked proton of which compound shows lowest  \(pK_a\) value ?
If the wavelength for an electron emitted from H-atom is 3.3 × 10–10 m, then energy absorbed by the electron in its ground state compared to minimum energy required for its escape from the atom, is ______ times. (Nearest integer)
\(\begin{array}{l}\left[\text{Given} : h = 6.626 \times 10^{-34}~ \text{J s}\right]\\ \left[\text{Mass of electron} = 9.1 \times 10^{-31} ~\text{kg}\right]\end{array}\)
Metal M crystallizes into a fcc lattice with the edge length of \(4.0 × 10^{–8} cm\). The atomic mass of the metal is _______ g/mol. (Nearest integer) 
(Use :\( N_A=6.02×10^{23} mol^{-1}\),density of metal , \(M = 9.03 g cm^{- 3}\))