List of top Chemistry Questions

Which of the following oxoacids of sulphur contains \(S\) in two different oxidation states?
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
Which of the following is not an example of benzenoid compound?
How many of the given compounds will give a positive Biuret test_________? Glycine, Glycylalanine, Tripeptide, Biuret.

Choose the correct answer :

1. Production of iron in blast furnace follows the following equation

Fe3O4(s)+4CO(g)→3Fe(I)+4CO22(g)

when 4.640 kg of Fe3O4 and 2.520 kg of CO are allowed to react then the amount of iron (in g) produced is

[Given : Molar Atomic mass (g mol–1) : Fe = 56

Molar Atomic mass (g mol–1) : O = 16

Molar Atomic mass (g mol–1) : C = 12]

Correct statement about photo-chemical smog is:
A company dissolves \(‘X’\) amount of \(CO_2\) at \(298\ K\) in \(1\) litre of water to prepare soda water. \(X\) = _____ \(× 10^{–3}\) g. (nearest integer)
(Given: partial pressure of \(CO_2\) at \(298\ K = 0.835\) bar. Henry’s law constant for \(CO_2\) at \(298\ K = 1.67\) Kbar. Atomic mass of \(H\), \(C\) and \(O\) is \(1\), \(12\), and \(6\) g mol–1, respectively)
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 :
Consider the following reaction:
 \({2HSO_4^ −}_{(aq)}\xrightarrow[(2)Hydrolysis]{(1)Electrolysis}  2HSO_4^− + 2H^+ + A\)
The dihedral angle in product A in its solid phase at 110 K is :
Which of the following compounds is not aromatic?
Given below are two statements.
Statement I : The chlorides of Be and Al have Cl-bridged structure. Both are soluble in organic solvents and act as Lewis bases.
Statement II : Hydroxides of Be and Al dissolve in excess alkali to give beryllate and aluminate ions.
In the light of the above statements, choose the correct answer from the options given below.
Fig.

The stable carbocation formed in the above reaction is

Choose the correct stability order of group 13 elements in their +1 oxidation state
Sugar moiety in DNA and RNA molecules, respectively are
The oxidation state of manganese in the product obtained in a reaction of potassium permanganate and hydrogen peroxide in basic medium is____.
How many of the following drugs is/are examples(s) of broad-spectrum antibiotics?
Ofloxacin, Penicillin G, Terpineol, Salvarsan.
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)
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)

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 :
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