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1. A
   $\text{ClO}_4^{2-}$
2. B
   $\text{ClO}_4$
3. C
   $\text{HCl}$
4. D
   $\text{ClO}_4^-$

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1. A
   Urea formaldehyde resin
2. B
   Glyptal
3. C
   Polycarbonate
4. D
   Thermacol

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1. A
   Acetone and formaldehyde
2. B
   Acetaldehyde and formaldehyde
3. C
   Acetone
4. D
   Acetaldehyde

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1. A
   124 pm
2. B
   131 pm
3. C
   137 pm
4. D
   174 pm

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1. A
   $\text{H}_3\text{C-CH}_2\text{-CH}_3$
2. B
   $\text{C}_2\text{H}_5\text{-O-CH}_3$
3. C
   $\text{C}_2\text{H}_6$
4. D
   $\text{C}_2\text{H}_5\text{-OH}$

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1. A
   Mg is reduced
2. B
   Mg is oxidised
3. C
   N₂ is oxidised
4. D
   oxidation state of Mg changes from +2 to zero

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1. A
   1 M KCl
2. B
   0.1 M KCl
3. C
   0.01 M KCl
4. D
   Saturated KCl

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1. A
   dil. Nitric acid
2. B
   conc. Nitrous acid
3. C
   conc. Sulphuric acid
4. D
   conc. HNO₃ + conc. H₂SO₄

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1. A
   S
2. B
   Se
3. C
   Cl
4. D
   Br

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1. A
   –45 kJ
2. B
   –60 kJ
3. C
   –75 kJ
4. D
   –90 kJ

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1. A
   Monodentate
2. B
   Bidentate
3. C
   Ambidentate
4. D
   Hexadentate

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1. A
   1.7
2. B
   2.0
3. C
   3.2
4. D
   4.5

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1. A
   15 minute
2. B
   20 minute
3. C
   25 minute
4. D
   33 minute

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1. A
   Trypsine
2. B
   Pepsin
3. C
   Myosine
4. D
   Keratine

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1. A
   2p
2. B
   3s
3. C
   3d
4. D
   4p

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1. A
   60 g mol$^{-1}$
2. B
   120 g mol$^{-1}$
3. C
   152 g mol$^{-1}$
4. D
   193 g mol$^{-1}$

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1. A
   Benzophenone
2. B
   Benzaldehyde
3. C
   Benzyl alcohol
4. D
   Benzoic acid

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1. A
   $3.01\times10^{22}$
2. B
   $2.01\times10^{23}$
3. C
   $6.02\times10^{22}$
4. D
   $5.02\times10^{23}$

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1. A
   Picric acid
2. B
   Sulphonic acid
3. C
   Salicylic acid
4. D
   Salicylaldehyde

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1. A
   40
2. B
   60
3. C
   80
4. D
   100

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1. A
   0.5
2. B
   0.77
3. C
   0.35
4. D
   0.75

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1. A
   $\log\left|\frac{xe^x}{1+xe^x}\right|+\frac{x}{1+xe^x}+c$
2. B
   $\log\left|\frac{xe^x}{1+xe^x}\right|+\frac{e^x}{1+xe^x}+c$
3. C
   $\log\left|\frac{xe^x}{1+xe^x}\right|+\frac{1}{1+xe^x}+c$
4. D
   $\log\left|\frac{xe^x}{1+xe^x}\right|-\frac{1}{1+xe^x}+c$

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1. A
   $\frac{1}{2}$
2. B
   $\frac{1}{3}$
3. C
   $\frac{1}{4}$
4. D
   $\frac{1}{8}$

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1. A
   If the squares of two numbers are not equal, then the numbers are equal.
2. B
   If the squares of two numbers are equal, then the numbers are not equal.
3. C
   If the squares of two numbers are equal, then the numbers are equal.
4. D
   If the squares of two numbers are not equal, then the numbers are not equal.

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1. A
   $\frac{x+\sqrt{x^2-4}}{2}$
2. B
   $\frac{2}{1+x^2}$
3. C
   $\frac{x-\sqrt{x^2-4}}{2}$
4. D
   $1+\sqrt{x^2-4}$

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