Chemistry NEB 2081 (MCQs) question paper

Group A

Very short answer questions(11 × 1 = 11)

1. 1.

   What is the molarity of $0.4\mathrm{N}\mathrm{Na}{}_2\mathrm{CO}{}_3$ solution? a) 0.1 M b) 0.2 M c) 0.4 M d) 0.8 M

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2. 2.

   Which of the following will have highest pH in water solution ? a) NaCl b) $\mathrm{Na}{}_2\mathrm{CO}{}_3$ c) KCl d) $\mathrm{CuSO}{}_4$

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3. 3.

   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

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4. 4.

   What is the enthalpy change in the reaction, $2\mathrm{CO}+\mathrm{O}{}_2\to 2\mathrm{CO}{}_2$ called? a) Enthalpy of combustion b) Enthalpy of formation c) Enthalpy of fusion d) Enthalpy of reaction

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5. 5.

   Which one of the following complex ions gives tetrahedral geometry ? a) $[\mathrm{Ni}(\mathrm{CN}){}_4]{}^{2-}$ b) $[\mathrm{NiCl}{}_4]{}^{2-}$ c) $[\mathrm{PtCl}{}_4]{}^{2-}$ d) $[\mathrm{CoF}{}_6]{}^{3-}$

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6. 6.

   Which of the following molecules does not act as a ligand ? a) $\mathrm{CO}{}_2$ b) $\mathrm{NH}{}_3$ c) $\mathrm{H}{}_2\mathrm{O}$ d) $\mathrm{CO}$

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7. 7.

   Which of the following is used to convert $>\mathrm{C}=\mathrm{O}$ group to $-\mathrm{CH}{}_2-$ ? a) $\mathrm{Ni}/\mathrm{H}{}_2/\mathrm{\Delta }$ b) $\mathrm{LiAlH}{}_4/\mathrm{\Delta }$ c) $\mathrm{Zn}-\mathrm{Hg}/\mathrm{HCl}/\mathrm{\Delta }$ d) $\mathrm{Pd}/\mathrm{H}{}_2/\mathrm{\Delta }$

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8. 8.

   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

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9. 9.

   $\mathrm{CH}{}_3\mathrm{Cl}\stackrel{Alc.AgCN}{\to }(\mathrm{A})\underset{\mathrm{\Delta }}{\overset{\text{LiAlH4}}{\to }}(\mathrm{B})$, what would be the product B ? a) Methanamine b) Ethanamine c) N - methyl methanamine d) N-methyl ethanamine

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10. 10.

    When the compound sodium ethoxide reacts with chloroethane, it gives the compound $\mathrm{C}{}_4\mathrm{H}{}_{10}\mathrm{O}$. What reaction is this ? a) Wurtz's reaction b) Williamson's synthesis c) Rosenmund's reduction d) Dehydrohalogenation reaction

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11. 11.

    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

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