List of top Chemistry Questions

The reaction of \( {C}_6{H}_5 {CH=CHCH}_3 \) with HBr produces:
How will a rise in temperature affect the viscosity of liquids and gases?
What is the hybridization of \([ {CrF}_6 ]^{3-}\)?
The structure of H\(_2\)O\(_2\) is:
X reacts with chlorine (\({Cl}_2\)) under boiling conditions to form Benzotrichloride, which further reacts with \(H_3O^+\) to form Y. Identify X and Y.
\[ \textbf{X} \xrightarrow{{Cl}_2, \text{Boiling}} \textbf{Benzotrichloride} \xrightarrow{H_3O^+} \textbf{Y} \]
The number of \( 3{C} - 2{e}^- \) bonds present in diborane is:
The total number of \( {P} - {OH} \) bonds for pyrophosphoric acid is:
In an adiabatic process, no transfer of heat takes place between the system and surroundings. Choose the correct option for free expansion of an ideal gas under adiabatic conditions from the following:

The given graph represents the variation of compressibility factor \( Z = \frac{pV}{nRT} \), for three real gases A, B, and C. Identify the only incorrect statement: 

In the molecules \( {CH}_4 \), \( {NF}_3 \), \( {NH}_4^+ \) and \( {H}_2{O} \),
Nylon-6,6 is obtained from:

Match the species in Column I with their types in Column II. 

The number of statement(s) correct from the following for Copper (at. no. 29) is/are ______.

  1. Cu(II) complexes are always paramagnetic
  2. Cu(I) complexes are generally colourless
  3. Cu(I) is easily oxidized
  4. In Fehling solution, the active reagent has Cu(I)
Match List-I with List-II
 List I List II
A.Lyophilic colloidiLiquid-liquid colloid
B.EmulsioniiProtective colloid
C.Positively chargediii\(FeCl_3 + NaOH\)
D.Negatively chargediv\(FeCl_3 + hot\; water\)

Choose the correct answer from the options given below :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : The ionic radii of \(O^{2–}\) and \(Mg^{2+}\) are same.
Reason (R) : Both \(O^{2–}\) and \(Mg^{2+}\) are isoelectronic species.
In the light of the above statements, choose the correct answer from the options given below.
Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonate to
Which of the following is structure of a separating funnel?
Match List I with List II
List I EnzymeList II Conversion of
AInvertaseIStarch into maltose
BZymaseIIMaltose into glucose
CDiastaseIIIGlucose into ethanol
DMaltaseIVCane sugar into glucose

Choose the most appropriate answer from the options given below:

Match List-I with List-II
 (Polymer)  (Used in)
A.BakeliteiRadio and television cabinets
B.GlyptaliiElectrical switches
C.PVCiiiPaints and Lacqures
D.PolystyreneivWater pipes

Choose the correct answer from the options given below:

Which of the following will have maximum stabilization due to crystal field?
‘A’ and ‘B’ respectively are: \(A\xrightarrow[(2)Zn-H_2O]{(1)O_3}\)
\(Ethane-1, 2-dicarbaldehyde + Glyoxal/Oxaldehyde\)
\(B \xrightarrow[(2)Zn-H_2O]{(1)O_3}   5 - oxohexanal\)
Match List-I with List-II
 List i List II
A.
Ch3(CH2)15
iDishwashing power
B.
CH3-(CH2)11
iiToothpaste
C.\(C_{17}H_{35}COO^–Na^++Na_2CO_3+Rosinate\)iiiLaundry soap
D.\(CH_3(CH_2)_{16}COO(CH_2CH_2O)CH_2CH_2OH\)ivHair conditional
Choose the correct answer from the options given below:
Match List-I with List-II.
 List I List II
A.Concentration ofiAniline
B. Leaching of aluminaiiNaOH
C.Froth stabilizeriii\(SO_2\)
D.Blister copperivNaCN

Choose the correct answer from the options given below.

Which of the following elements is considered as a metalloid?
The role of depressants in ‘Froth Floation method’ is to