Chemistry

What is the molarity of 0.4 N \( Na_2CO_3 \)solution?

A) 0.1 M        B) 0.2 M        C) 0.4 M         D) 0.8 M

Which of the following will have highest pH in water solution?

A) NaCl        B) \( Na_2CO_3 \)     C) KCl             D) \( CuSO_4 \)

What kind of battery is used in a laptop computer and mobile phone?

A) Li-ion battery    B) Dry cell battery     C) Fuel cell battery       D) Simple cell battery

What is the enthalpy change in the reaction,\( 2CO + O_2 \rightarrow 2CO_2 \) called?

A) Enthalpy of combustion                             B) Enthalpy of formation   

C)  Enthalpy of fusion                                    D) Enthalpy of reaction   

Which one of the following complex ions gives tetrahedral geometry? 

A) \( [Ni(CN)_4]^{2-} \)     B) \( [NiCl_4]^{2-} \)   C) \( [PtCl_4]^{2-} \)     D) \( [CoF_6]^{3-} \)

Which of the following molecules does not act as a ligand?

A) \( CO_2 \)      B) \( NH_3 \)       C)\( H_2O \)   D) CO

Which of the following is used to convert >C=O group to\( -CH_2- \)?

A) \( Ni / H_2 / \Delta \)        B) \( LiAlH_4 / \Delta \)     C) \( Zn-Hg / HCl / \Delta \)       D) \( Pd / H_2 / \Delta \)

Benzoic acid gives benzene on being heated with 'X' and phenol gives benzene on being heated with 'Y'. Therefore, X and Y are respectively : 

A) Sodalime and copper          B) Zn dust and NaOH

 C) Zn dust and sodalime        D) Sodalime and Zn dust

\( CH_3Cl \xrightarrow{Alc. AgCN}  (A) \xrightarrow[\Delta]{LiAlH_4} (B) \) what would be the product B?

 A) Methanamine     B) Ethanamine     C) N-methyl methanamine      D) N-methyl ethanamine

When the compound sodium ethoxide reacts with chloroethane, it gives the compound\( C_4H_{10}O \). What reaction is this?

A) Wurtz's reaction                B) Williamson's synthesis

C) Rosenmund's reduction     D) Dehydrohalogenation reaction

What would be the product when ketone is treated with Grignard's reagent?

A) Primary alcohol       B) Secondary alcohol

C) Tertiary alcohol       D) Methyl alcohol 

An electrochemical cell (galvanic cell) is designed by coupling Zn-electrode with standard hydrogen electrode (SHE). Given, \( E^\circ_{Zn^{++}/Zn} = -0.76\text{ V} \) 

i) Draw the galvanic cell. 

 ii) Write down complete cell reaction.

iii) Calculate the emf of the cell. 

           OR 

  What is Hess's law of constant heat summation? Calculate the heat of formation of ethanol from the following data:

  \( H_2(g) + \frac{1}{2}O_2(g) \rightarrow H_2O(l)$, $\Delta H = -286.2\text{ KJ/mol} \)

  \( C(s) + O_2(g) \rightarrow CO_2(g)$, $\Delta H = -393.2\text{ KJ/mol} \)

\( C_2H_5OH(l) + 3O_2(g) \rightarrow 2CO_2(g) + 3H_2O(l), \Delta H = -1368\text{ KJ/mol} \)

Define the following terms.

i) Lewis base

ii) Basic buffer 

Calculate the pH of solution obtained by mixing equal volumes of two solutions having pH=3 and pH=5. 

A heavy metal is extracted from its oxide ore. During extraction, smelting of the calcined ore is done in a blast furnace.

a) Name the metal and the ore.

b) Draw the clean and labelled diagram of the blast furnace showing different zones.

c) Write down the balanced chemical equations of slag formation reactions.

Write two methods of preparation of corrosive sublimate. Give its action with:

a) excess of KI     b) NH₃      

i) Starting from nitrobenzene, how would you prepare aniline? Convert aniline into: 

a) phenyl isocyanide

b) azo-dye

 ii) Nitrobenzene prefers electrophilic substitution reaction at meta-position. Explain.

A sequence of chemical reactions is represented as:

\( A \xrightarrow[\text{Ice cold}]{NaNO_2 + dil. HCl} B \xrightarrow{[O]}{KMnO_4 / H^+} CH_3CHO \)

a) Identify the compounds (A) and (B). 

b) Write the laboratory test of compound (B).

c) Starting from compound (B), how would you obtain nitrolic acid? 

d) Predict the product when compound (A) is heated with chloroform in alcoholic medium. 

      OR 

Make a correct sequence of reactions using suitable conditions and reagents of the following compounds.

Benzene, Benzaldehyde, Toluene, Cinnamic acid, Sodium benzoate, Benzoic acid.

Write a chemical equation for each of the following. 

 a) 2, 4-DNP test

 b) Oxo-process

c) Claisen condensation reaction

d) Wurtz-Fittig reaction

 e) Carboxylation reaction

The chlorinated compound 'A' reacts with acetone to give sleep-inducing drug.

a) How would you prepare compound 'A' by using one of the isomers of \( C_2H_6O \)? 

 b) What happens when compound 'A' is:

  i) Exposed in air? 

 ii) Heated with phenol in the presence of aq. \( NaOH \)? 

a) Distinguish between pseudo first order and first order reaction giving an example of each.

b) Draw an energy profile diagram showing energy of activation for endothermic reaction.

c) The hypothetical data for the reaction,\(  2A + B \rightarrow C \), are:

Calculate the rate of formation of 'C' when the concentration of 'A' and 'B' are \( [0.6]\text{ molL}^{-1} \) and \( (0.3)\text{ molL}^{-1} \) respectively. 

        OR 

a) Deduce normality equation. 

b) Give reason.

i) Methyl orange is used as indicator for the titration between \( H_2SO_4 \) and \( Na_2CO_3 \) 

ii) Oxalic acid solution is warmed by adding \( dil. H_2SO_4 \) before titration with \( KMnO_4 \)

c) 0.70 g of a sample of \( Na_2CO_3 \cdot xH_2O \) was dissolved in water and volume was made 100 ml. 20 ml of this solution required 19.8 ml of \( \frac{N}{10}\ HCl \) for complete neutralization. Find the value of x. 

a) Give any two chemical reactions for the preparation of ethanoic acid. 

b) How does ethanoic acid react with 

i) \( P_2O_5 \)

ii)\( NH_3 \)?

c) A carbonyl compound 'A' gives both Tollen's and iodoform tests positively.

i) Identify the compound 'A'. 

ii) How does the compound 'A' react with dil. NaOH? Give chemical equation involved. 

iii) Write the chemical equation when compound 'A' reacts with HCN followed by hydrolysis. 

a) An aromatic compound (A) undergoes Sandmeyer's reaction to give (B). The compound (B) is reduced with Ni-Al in presence of alkali to give compound (C). The compound (C) further reacts with \( CH_3Cl \) in the presence of Anhydrous \( AlCl_3 \). The compound (B) when heated with chloral in acidic medium gives a common insecticide. Identify (A), (B), (C) and (D) giving complete reaction. 

 b) How do you separate the isomers of\( C_3H_9N \) by Hoffmann's method? Explain with suitable chemical equations.

a) Define homopolymer and co-polymer.

 b) Differentiate between paper and pulp. 

 c) Distinguish between OPC and PPC cement. 

 d) Write down any two uses of radioisotopes in medical field.