Guess Paper of Chemistry Class 11

• Our comprehensive Guess Paper of Chemistry Class 11 will ensure you're fully prepared for your exams.
• Important Physics 11th class multiple-choice questions (MCQs) from previous 20 years past papers from all Punjab Boards.
• Important Physics 11th class Short Questions from previous 20 years past papers from all Punjab Boards.
• Important Physics 11th class Long Questions from previous 20 years past papers from all Punjab Boards.
• What are isotopes? Why they have same chemical but different physical properties?
• Define isotopes why they have same chemical properties?
• Explain mathematical relationship of m/e of an ion in mass spectrometry.
• How does no individual neon atom in the sample of the element has mass 20.18 amu?
• Write functions of Mg (ClO4)2 and KOH in combustion analysis.
• Why oxygen cannot be determined directly in combustion analysis?
• Many chemical reactions taking place in our surrounding involve limiting reactants. Give reason
• Define actual yield. Write formula for the calculation of % age yield.
• Why actual yield is always less than theoretical yield?
• Why we calculate % age yield?
• Law of conservation of mass has to be obeyed during stoichiometric calculations. Explain?
• Define empirical formula and molecular formula with examples.
•  How 4.9 g of H2SO4 when completely ionized in water have equal number of +ve and –ve charges but the number of positively charged ions are twice the number of negatively charged ions.
• 23 g of sodium and 39 g of potassium have equal number of atoms in them. Justify.
• What is Avogadro’s number? Give equation to relate the Avogadro’s number and mass of element.
• Why do 2 g of H2, 16g of CH4, 44g of CO2 occupy separately the volume of 22.414 dm3 although the sizes and masses of molecules of three gases are very different from each other?
• What is spectrum? Differentiate between continuous spectrum and line spectrum.
• What is thermochemical equation? Give example.
• What is the difference between heat and temperature?
• Differentiate between endothermic and exothermic reactions. Give one example of each.
• ∆H neutralization of strong acid with strong base always remains constant.
• With the help of an example, explain enthalpy of neutralization.
• Describe cleaning action of soaps and detergents on the basis of H-bonding.
• Ethyl alcohol can dissolve in water but- hydrocarbons are not soluble in water. Justify it.
• Lower alcohols are soluble in water but hydrocarbons are insoluble. Give reason. 
• How the liquid crystals, help in the detection of the blockage in Veins and arteries?
• The Electrical Conductivity of metals decreases conductivity of a metal with the rise of temperature.
• Define rate of a chemical reaction and give its units.
• Define specific rate constant. Give equation to support your answer.  
• What is molarity? Calculate the molarity of a solution containing 9g of glucose in 250 cm3 of solution.
• How molality is independent of temperature, but molarity depends on temperature?
• One molal solution of glucose is dilute as compared to one molar solution of glucose. Justify it?
• Why 1 molal solution of NaOH is dilute as compared to one molar solution?
• One molal solution of urea is dilute as compared to one molar solution of urea. Justify it?
•  Draw M.O.T diagram of Hydrogen molecule showing its bonding and antibonding molecular orbitals.
• Differentiate between atomic orbital and molecular orbital. 
• Working at a vacuum line, a chemist isolated a gas in a weighing bulb with a volume of 255 cm3, at a temperature of 25oC and under a pressure in the bulb of 10.0 torr. The gas weighted 12.1 mg. What is the molecular mass of this gas?
• What is boiling point? What is the effect of external pressure on the boiling point? Why the temperature remains constant at boiling point although heat is continuously supplied.