Q1
mcq
1 mark
During the decomposition of H$_2$O$_2$ to give dioxygen, 48 g O$_2$ is formed per minute at certain point of time. The rate of formation of water at this point is :
- A. 2.25 mol min$^{-1}$
- B. 0.75 mol min$^{-1}$
- C. 3.0 mol min$^{-1}$
- D. 1.5 mol min$^{-1}$
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Q2
mcq
1 mark
How many moles of I$_2$ are liberated when 1 mole of potassium dichromate react with potassium iodide ?
- A. 3
- B. 1
- C. 4
- D. 2
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Q3
mcq
1 mark
Non-stick cookwares generally have a coating of a polymer, whose monomer is :
- A. chloroethene
- B. ethane
- C. 1,1,2,2-tetrafluoroethane
- D. prop-2-enenitrile
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Q4
mcq
1 mark
The compound that reacts with nitrous acid to give yellow oily liquid is __________.
- A. N-methylaniline
- B. Nitro benzene
- C. N,N-dimethyl aniline
- D. Aniline
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Q5
mcq
1 mark
Boric acid is an acid because its molecule :
- A. combines with proton to form water molecule.
- B. contains replaceable H$_1$ ion.
- C. accepts OH$^-$ from water, releasing proton.
- D. gives up a proton.
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Q6
mcq
1 mark
In an electrical field, the particles of a Colloidal system move towards cathode. The coagulation of the same sol is studied using (i) K$_2$SO$_4$, (ii) Na$_3$PO$_4$, (iii) K$_4$[Fe(CN)$_6$] and (iv) NaCl. Their coagulating power should be :
- A. (iii) > (ii) > (i) > (iv)
- B. (i) > (ii) > (iii) > (iv)
- C. (ii) > (i) > (iv) > (iii)
- D. None of these
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Q7
mcq
1 mark
Assertion: Bond dissociation energy of Fluorine is greater than Chlorine gas. Reason : Chlorine has more electronic repulsion than Fluorine.
- A. Assertion is true but Reason is false.
- B. Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
- C. Both Assertion and Reason are false.
- D. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
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Q8
mcq
1 mark
In calcium fluoride, having the flurite structure, the coordination number of Ca$^{21}$ ion and F$^-$ ion are :
- A. 8 and 4
- B. 4 and 2
- C. 4 and 8
- D. 6 and 6
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Q9
mcq
1 mark
The secondary structure of a protein refers to _________.
- A. sequence of α-amino acids
- B. fixed configuration of the polypeptide backbone
- C. α-helical backbone
- D. hydrophobic interaction
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Q10
mcq
At 258C, ionic product constant $K_w$ of water is 1.00×10$^{-14}$. Its value at 408C is __________.
- A. 1.00×10$^{-14}$
- B. 1.14×10$^{-15}$
- C. 2.71×10$^{-14}$
- D. 2.95×10$^{-15}$
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Q11
mcq
What is the oxidation number of the central metal ion in the complex, [Pt(NO$_2$)(H$_2$O)(NH$_3$)$_2$]Br ?
- A. 14
- B. 12
- C. 16
- D. 13
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Q12
mcq
The number of electrons that have a total charge of 9650 coulombs is :
- A. 6.022×10$^{22}$
- B. 6.22×10$^{23}$
- C. 6.022×10$^{-34}$
- D. 6.022×10$^{24}$
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Q13
mcq
Which one of the following is the Strongest acid ?
- A. 4-nitrophenol
- B. 2-nitrophenol
- C. 3-nitrophenol
- D. 4-chlorophenol
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Q14
mcq
3 5 KCN H O PCl 3CH Br (A) (B) (C)→ → → + Product (C) is :
- A. chloro acetic acid
- B. α-chlorocyano ethanoic acid
- C. acetylchloride
- D. none of these
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Q15
mcq
Extraction of gold and silver involves leaching with cyanide ion. Silver is later recovered by :
- A. Displacement with Zinc
- B. Distillation
- C. Liquation
- D. Zone refining
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Q16
short answer
Which type of ores can be concentrated by froth floatation method ? Give an example for ores.
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Q18
short answer
Why do Zirconium and Hafnium exhibit similar properties ?
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Q21
short answer
Peptising agent is added to convert precipitate into colloidal solution. Explain this statement with an example.
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Q24
short answer
Find the products X and Y in the following reactions.
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Q26
short answer
Write short notes on bleaching action of Sulphur dioxide.
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Q27
short answer
What are hydrate isomers ? Explain with an example.
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Q28
short answer
Distinguish tetrahedral and octahedral voids.
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Q29
short answer
What are the limitations of Freundlich adsorption isotherm ?
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Q30
short answer
Identify compounds A, B and C in the following sequence of reaction.
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Q31
short answer
What is Condensation Polymer ? Give two examples.
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Q32
short answer
Mention any three functions of lipids in living organism.
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Q33
short answer
The rate of a first order reaction is 1.54×10$^{-3}$ $s^{-1}$. Calculate its half life period.
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Q33
short answer
The rate constant for a first order reaction is $1.54 \times 10^{-3} s^{-1}$. Calculate its half life time.
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Q35
long answer
Describe the role of the following in the process mentioned. (1)Cryolite in the extraction of Aluminium. (2)Iodine in the refining of Zirconium.
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Q36
long answer
State any three properties of inter halogen compounds.
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Q39
long answer
Describe the preparation of potassium dichromate.
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Q41
long answer
Write a short note on metal excess defect with an example.
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Q42
long answer
Explain Pseudo first order reaction with an example.
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Q43
long answer
Calculate the pH of 0.1 M CH$_3$COOH solution. Dissociation constant of acetic acid is 1.8×10$^{-5}$.
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Q45
long answer
How will you convert (i)Ethyl alcohol → Ethene (ii)Ethylene glycol → 1,4-dioxane (iii)Glycerol → Acrolein
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Q46
long answer
An organic compound (A) of molecular formula C$_7$H$_6$O undergoes Cannizaro reaction. Compound (A) also reacts with Chlorine in the presence of Conc.FeCl$_3$ to give Compound (B). Compound (A) reacts with Chlorine in the absence of catalyst to give Compound (C). Identify A, B and C with suitable reactions.
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Q47
long answer
How will you distinguish between nitro and aci form of CH$_3$NO$_2$ ?
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Q48
long answer
What are the types of RNA which are found in cell ?
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