Author: Dr. Vikas Jasrotia

Electrolysis of an Aqueous Solution of CuSO4  Que. What will happen during the electrolysis of an aqueous solution of CuSO4 in the presence of Cu electrodes? (A) Copper will deposit at cathode (B) Copper will dissolve at the anode (C) Oxygen will be released at the anode (D) Copper will deposit at the anode Ans. Option (A) and (B) is correct. Explanation: Electrolysis of CuSO4 can be represented by two half-cell reactions these occurring at cathode and anode, respectively, as given below At cathode: Cu2+ + 2e– → Cu(s) At anode: Cu(s) → Cu2+ + 2e– On dissolution of CuSO4 in…

Hydrocarbon MCQ for NEET PDF – Class 11 Chemistry Hydrocarbon MCQ for NEET PDF Que 1. Which of the following is Baeyer’s reagent? (a) Alkaline KMnO4 (b) Acidic K2Cr2O7 (c) Alkaline Na2Cr2O7 (d) MnO2 Ans 1. (a) Baeyer’s reagent is an alkaline solution of cold potassium permanganate (KMnO4). Que 2. The function of anhydrous AlCl3 in Friedel– Crafts reaction is (a) To absorb water (b) To absorb HCl (c) To produce attacking electrophile (d) To produce nucleophile. Ans 2. (c) AlCl3 produces attacking electrophile Cl2 + AlCl3 → Cl+ + AlCl4- Que 3. Meta-directing and deactivating group in aromatic electrophilic…

MCQ Questions for Class 11 Chemistry Chapter 7 – Equilibrium With Answers MCQ Questions for Class 11 Chemistry Chapter 7 – Equilibrium With Answers 1. A reversible reaction is one which (a)  Proceeds in one direction (b)  Proceeds in both directions (c)  Proceeds spontaneously (d)  All the statements are wrong Ans 1. (b) 2. Which of the following is a characteristic of a reversible reaction (a)  Number of moles of reactants and products are equal (b)  It can be influenced by a catalyst (c)  It can never proceed to completion (d)  None of the above Ans 2. (c) 3. In…

Chemistry Class 11 Chapter 7 Equilibrium – Important Questions Chemistry Class 11 Chapter 7 Equilibrium Que 1. What is the effect of catalyst on equilibrium constant Kc? Ans 1. A catalyst does not affect the equilibrium constant because it speeds up both forward and backward reactions to the same extent. Que 2. What will be the pH of the Na2SO4 solution? Ans 2. Na2SO4 is salt of a strong base, thus its aqueous solutions will be neutral. Therefore, its pH will be 7. Que 3. What happens to the equilibrium PCl5 (g) ⇌ PCl3 (g) + Cl2 (g) if nitrogen is added to…

Important Questions for CBSE Class 11 Chemistry Chapter – 7 Equilibrium Important Questions for CBSE Class 11 Chemistry Chapter – 7  Equilibrium Que 1. For an exothermic reaction, what happens to the equilibrium constant if the temperature is raised? Ans 1.  For an exothermic reaction, Kb will increase with rising in temperature much more than Kf. As a result, Kf/Kb will decrease. Que 2. Ice melts slowly at higher altitudes, explain why? Ans 2. Ice (s) → Water The melting of ice is favored at high pressure because of the decrease in volume in the forward reactions. Since at high…

Important Questions for CBSE Class 11 Chemistry Chapter 6 – Thermodynamics Important Questions for CBSE Class 11 Chemistry Que 1. What is meant by average bond energy? In what way is it different from the bond energy of a diatomic molecule? Give a suitable example. Ans 1. Average bond energy is used in the case of polyatomic molecules because even though the molecule maybe contain identical bonds with identical bond length and energy, the energy required to break the individual bonds differ in each successive step. So, in such cases, average bond energy is used. For example, in CH4 molecule,…

CBSE Class 11 Chemistry Chapter-6 Important Questions Class 11 Chemistry Chapter-6 Que 1. Neither q nor w is a state function but q + w is a state function. Explain. Ans 1. Both q and W are not state functions but q + W is equal to ΔU which is a state function. Que 2. A gas absorbs 200 J of heat and expands against the external pressure of 1.5 atm from a volume of 0.5 litres. Calculate the change in internal energy. Ans 2. w = – PΔV = – 1.5 × (1.0 – 0.5) = – 0.75 litre…

Assertion Reason Type Questions Class 11 – Chapter Chemical Equilibrium Assertion Reason Type Questions Class 11 (a) if both assertion and reason are true and the reason is the correct explanation of the assertion. (b) If both assertion and reason are true but the reason is not the correct explanation of the assertion. (c) If the assertion is true but the reason is false. (d) If the assertion is false but the reason is true. 1. Assertion: The equilibrium constant is fixed and is the characteristic of any given chemical reaction at a specified temperature. Reason: The composition of…

A Violet Compound of Manganese (A) Decomposes Que: A violet compound of manganese (A) decomposes on heating to liberate oxygen and compounds (B) and (C) of manganese is formed. Compound (C) reacts with KOH in the presence of KNO3 to give compound (B). On heating compound (C) with conc. H2SO4 and NaCl, Cl2 gas is liberated and compound (D) of manganese is formed. Identify A, B, C, D along with reactions involved. Ans: A – KMnO4                                 B – K2MnO4                C – MnO2                    D – MnCl2 KMnO4 → K2MnO4 + MnO2 + O2  (A)         …

NCERT Solutions for Class 10 Science Chapter 4 NCERT Solutions for Class 10 Science Chapter 4 Que 1. What would be the electron dot structure of carbon dioxide which has the formula CO2? Ans 1. A Lewis electron dot diagram (or electron dot diagram or a Lewis diagram or a Lewis structure) is a representation of the valence electrons of an atom that uses dots around the symbol of the element. The number of dots equals the number of valence electrons in the atom. Carbon: Atomic Number – 6, Electronic Configuration – 2,4, Number of valence electrons – 4 Oxygen: Atomic Number…