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Model 1 Mark Book Back Questions (New Syllabus) 2020

12th Standard EM

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Chemistry

Time : 00:15:00 Hrs
Total Marks : 17

    Part A

    17 x 1 = 17
  1. Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?

    (a)

    \(\Delta { G }_{ f }^{ 0 }\) of sulphide is greater than those for CS2 and H2S

    (b)

    \(\Delta { G }_{ r }^{ 0 }\) is negative for roasting of sulphide ore to oxide

    (c)

    Roasting of the sulphide to its oxide is thermodynamically feasible

    (d)

    Carbon and hydrogen are suitable reducing agents for metal sulphides

  2. The basic structural unit of silicates is (NEET)

    (a)

    \(\left( SiO_{ 3 } \right) ^{ 2- }\)

    (b)

    \(\left( SiO_{ 4 } \right) ^{ 2- }\)

    (c)

    \(\left( Sio \right) ^{ - }\)

    (d)

    \(\left( SiO_{ 4 } \right) ^{ 4- }\)

  3. The basicity of pyrophosphorous acid ( H4P2O5) is

    (a)

    4

    (b)

    2

    (c)

    3

    (d)

    5

  4. Which of the following compounds is colourless?

    (a)

    Fe3+

    (b)

    Ti4+

    (c)

    Co2+

    (d)

    Ni2+

  5. As per IUPAC guidelines, the name of the complex [Co(en)2(ONO)Cl]Cl is

    (a)

    chlorobisethylenediaminenitritocobalt(III) chloride

    (b)

    chloridobis(ethane-1,2-diamine)nitro  K-Ocobaltate(III) chloride

    (c)

    chloridobis(ethane-1,2-diammine)nitrito K-Ocobalt(II) chloridde

    (d)

    chloridobis(ethane-1,2-diamine)nitro K-Ocobalt(III) chloride

  6. In calcium fluoride, having the flurite structure the coordination number of Ca2+ ion and F- Ion are (NEET)

    (a)

    4 and 2

    (b)

    6 and 6

    (c)

    8 and 4

    (d)

    4 and 8

  7. The addition of a catalyst during a chemical reaction alters which of the following quantities? (NEET)

    (a)

    Enthalpy

    (b)

    Activation energy

    (c)

    Entropy

    (d)

    Internal energy

  8. What is the decreasing order of strength of bases
    OH, NH2- H - C ≡ C and CH3 - CH2-

    (a)

    OH->NH2- >H-C≡C >CH3-CH2-

    (b)

    NH2->OH->CH3-CH2- >H-C≡C

    (c)

    CH3-CH2->NH2->H-C≡C->OH-

    (d)

    OH->H-C ≡ C->CH3-CH2- >NH2-

  9. How many faradays of electricity are required for the following reaction to occur
    MnO→ Mn 4-

    (a)

    5F

    (b)

    3F

    (c)

    1F

    (d)

    7F

  10. Hair cream is

    (a)

    gel

    (b)

    emulsion

    (c)

    solid sol

    (d)

    sol.

  11. Which one of the following is the strongest acid

    (a)

    2 - nitrophenol

    (b)

    4 – chlorophenol

    (c)

    4– nitrophenol

    (d)

    3 – nitrophenol

  12. The formation of cyanohydrin from acetone is an example of

    (a)

    nucleophilic substitution

    (b)

    electrophilic substitution

    (c)

    electrophilic addition

    (d)

    Nucleophilic addition

  13. Phenyl methanal is reacted with concentrated NaOH to give two products X and Y. X reacts with metallic sodium to liberate hydrogen X and Y are

    (a)

    sodiumbenzoate and phenol

    (b)

    Sodium benzoate and phenyl methanol

    (c)

    phenyl methanol and sodium benzoate

    (d)

    none of these

  14. The product formed by the reaction an aldehyde with a prmary amine

    (a)

    carboxylic acid

    (b)

    aromatic acid

    (c)

    schiff ’s base

    (d)

    ketone

  15. Among the following the achiral amino acid is

    (a)

    2-ethylalanine

    (b)

    2-methylglycine

    (c)

    2-hydroxymethylserine

    (d)

    Tryptophan

  16. Which of the following are epimers

    (a)

    D(+)-Glucose and D(+)-Galactose

    (b)

    D(+)-Glucose and D(+)-Mannose

    (c)

    Neither (a) nor (b)

    (d)

    Both (a) and (b)

  17. Terylene is an example of

    (a)

    polyamide

    (b)

    polythene

    (c)

    polyester

    (d)

    polysaccharide

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