Chemistry

Which order of reaction does the following chemical equation represent? \( \text{RCOOR} + \text{H}_2\text{O} \xrightarrow{\text{H}^+} \text{RCOOH} + \text{ROH} \)

A) Zero order     B) Pseudo-first order     C) Second order    D) Third order

What is the normality of\( 5\% \text{Na}_2\text{CO}_3 \) solution?

 A) \( 0.94\text{ N} \)    B) \( 0.98\text{ N} \)    C) \( 0.99\text{ N} \)      D)\( 1.01\text{ N} \)

Which of the following is the ionic product of water at \( 393\text{ K} \)?

A) Greater than \( 1 \times 10^{-14} \)     B) Less than \( 1 \times 10^{-14} \)

C) Equal to\( 1 \times 10^{-14} \)             D) Equal to \( 1 \times 10^{-7} \)

For what purpose is the hydrogen-oxygen fuel cell used in spacecraft?
A) Power for heat and light        B) Power for pressure
C) Power for propellation           D) Power for uplift

Which of the following indicates lithophone?

A)\( \text{ZnS} + \text{BaSO}_4 \)     B) \( \text{ZnSO}_4 + \text{BaSO}_4 \)

 C) \( \text{ZnCO}_3 + \text{BaS} \)    D) \( \text{ZnS} + \text{BaSO}_3 \)

Which of the following is the purest form of iron?
A) Cast iron    B) Steel     C) Haematite    D) Wrought iron

Nitrobenzene can be prepared from benzene by using a mixture of conc. nitric acid and conc.\( \text{H}_2\text{SO}_4 \) in the nitrating mixture. What is the role of nitric acid?

 A) A base     B) An acid     C) A catalyst     D) A reducing agent

You are given (I) aniline (II) o-nitro aniline (III) p-nitro aniline and (IV) m-nitroaniline. What is the order of increasing basic nature?

A) \( \text{II} < \text{I} < \text{III} < \text{IV} \)    B) \( \text{I} < \text{II} < \text{III} < \text{IV} \)

C)\( \text{II} < \text{III} < \text{I} < \text{IV} \)     D) \( \text{II} < \text{III} < \text{IV} < \text{I} \)

What would be the product when benzaldehyde is heated with conc. \( \text{NaOH} \)?

A) Benzyl alcohol and sodium benzoate     B) Sodium benzoate and benzaldehyde

C) Sodium benzoate and benzene             D) Benzyl alcohol and benzene

A compound 'X' undergoes reduction with \( \text{LiAlH}_4 \) to yield 'Y'. When 'Y' is passed over copper heated to \( 300^\circ\text{C} \), 'X' is formed. What is 'Y'?

A) Acetone     B) Ethanal     C) Ethanol       D) Ethoxyethane

a) Write any two differences between primary standard and secondary standard substance. 

b) \( 3.15 \text{ g} \) of oxalic acid crystal\( (\text{C}_2\text{H}_2\text{O}_4 \cdot 2\text{H}_2\text{O}) \) was dissolved in water to make \( 500 \text{ mL} \) of its solution.

i) Determine the normality of the acid. 

 ii) The acid solution became permanently pink when \( 400 \text{ mL} \) of \( \text{KMnO}_4 \) solution (\( \text{eq.wt.} = 31.5 \)) was added during titration. What mass of the \( \text{KMnO}_4 \) is present in 1 liter of the solution? 

Why is standard hydrogen electrode called reference electrode? 

 An electrochemical cell connects \( \text{E}^\circ_{\text{Zn}^{++}/\text{Zn}} \) electrode with standard hydrogen electrode and the emf of the cell is found to be \( +0.76 \text{ V} \)

i) Design cell notation indicating cathode and anode. 

 ii) Write down net cell reaction. 

 iii) What is the value of \( \text{E}^\circ_{\text{Zn}^{++}/\text{Zn}} \)? 

OR

a) State Hess's law of constant heat summation and illustrate it with an example. 

b) Heat of formation of \( \text{CO}_2 \) and \( \text{H}_2\text{O} \) are \( -94 \text{ kcal} and -68 \text{ kcal} \), respectively. Calculate heat of reaction when 2 mole of \( \text{CH}_4 \) is formed. 

A) Identify A and B in the following reaction sequence.

i) Write down correct chemical equation to identify A and B. 

ii) What product would you obtain when A is:

a) boiled with water? 

b) treated with aniline? 

B) What happens when \( \text{C}_6\text{H}_5\text{Cl} \)is heated with chloral? 

A list of organic compounds is given as follows:

Propanamine, ethoxyethane, ethyl cyanide, iodoethane and ethanol

Prepare a correct sequence of reaction chain from the above compounds using suitable reagents and conditions. 

OR

An organic compound A gives compound B when heated with silver powder. The compound B undergoes hydrolysis with water in presence of \( \text{dil. H}_2\text{SO}_4 \) and \( 1\% \text{ HgSO}_4 \) to yield C. The compound C reacts with dilute alkali to form D. The compound C can also be obtained by the reduction of ethanoyl chloride with hydrogen in presence of \( \text{Pd/BaSO}_4 \). Identify A, B, C and D with pertinent reactions.

Give an example of each of the following reactions.

a) Tollen's test

 b) Cannizzaro's reaction

c) Decarbonylation

d) Reimer-Tiemann's reaction

 e) Oxo-process

Starting from \( \text{CH}_3\text{MgBr} \), how you would prepare ethanoic acid? Write the action of ethanoic acid on: 

 i) \( \text{NH}_3 \)                ii) \( \text{SOCl}_2 \)              iii) \( \text{P}_2\text{O}_5 \)               iv)\( \text{LiAlH}_4 \)

Write the preparation, properties and uses of mercuric chloride.

A metal having electronic configuration \( [\text{Ar}] 3\text{d}^{10}, 4\text{s}^1 \) belongs with IIB of the periodic table. The metal is widely used to make electric wires and domestic cooking utensils.

a) Draw a well-labelled blast furnace for smelting the metal from its ore.

 b) Write down chemical reactions that occur in the smelting process.

a) Write any two differences between order and molecularity of a reaction. 

 b) Draw a graph showing the relationship between concentration of reactant and time for a zero order reaction.

c) The experimental data for a hypothetical reaction \( \text{X} + \text{Y} \rightarrow \text{Z} \) is:

Determine the rate constant and write down rate law equation from the above data. 

d) What is the order of reaction with respect to X ? 

OR

a) i) What is meant by weak electrolyte? 

ii) Derive Ostwald's dilution equation. 

iii) Point out any two limitations of Ostwald's dilution law. 

b) Predict whether precipitation will occur or not on mixing \( 20\text{ mL} \) of \( 1 \times 10^{-3}\text{ N} \) of \( \text{NaCl} \) solution with \( 80\text{ mL} \) of \( 1 \times 10^{-2}\text{N} \) \( \text{AgNO}_3 \) solution if \( \text{K}_{\text{sp}} \) for \( \text{AgCl} = 1.5 \times 10^{-10} \).\( [At.wt. of \text{Ag} = 108\text{ amu}.] \) 

Explain Hoffmann's method to separate ethanamine and N-methylmethanamine from their mixture. 

b) What happens when: 

i) chloroform is treated with acetone in presence of aq. \( \text{KOH} \)?

ii) ethanal reacts with 2,4–DNP ?

iii) aniline is added to ice-cold solution of sodium nitrite and hydrochloric acid?

iv) Nitro-benzene is subjected to electrolytic reduction ?

OR

a) Identify\( \text{A}, \text{B}, \text{C} and \text{D} \) in the following reaction sequence.

\( \text{A} \xrightarrow[\Delta]{\text{NaOH} + \text{CaO}} \text{B} \xrightarrow{\text{CHCl}_3 / \text{AlCl}_3} \text{C} \xrightarrow{[\text{O}]}{\text{CrO}_2\text{Cl}_2 / \text{H}^+} \text{D} \)

Compound 'C' can be obtained by Clemmensen's reduction of benzaldehyde. 

b) Explain the test of propan-1-ol and propan-2-ol by using Victor-Meyer's method in detail.

a) Explain the quality control system in the manufacture of portland cement. 

b) Give the correct structure of the following compounds

. i) Aspirin ii) DDT

c) Write any two differences between paper and pulp. 

d) What is meant by artificial radioactivity ? Write an example of it.