11.

Which of the following represents the smallest quantity?

• 1230g

• 1.230 × 10^-4 g

• 1.230 × 10^-6 kg

• 1.230 × 10⁴ µg

How is 0.0120 written as a scientific notation?

• 120 × 10^-4

• 1.2 × 10^-2

• 12 × 10^-3

• 12.0 × 10^-3

Which one of the following represents the correct ratio of the energy of electron in ground state of H atom to that of the electron in the first excited state of Li⁺?

• 4 : 9

• 9 : 4

• 1 : 4

• 4 : 1

If the equilibrium constant for reaction (i) is 2, what is the equilibrium constant for reaction (ii)?

CO₂ $\leftrightharpoons$CO + $\frac{1}{2}{\mathrm{O}}_2 ....\left(\mathrm{i}\right)$

2CO₂ + O₂ $\rightleftharpoons$2CO₂ ...(ii)

• 1/4

• 1/2

• 1

• 2

Which of the following comments about the following equilibrium reaction is the most correct?

${\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right) + {\mathrm{NH}}_3\left(\mathrm{aq}\right) \rightleftharpoons {\mathrm{HSO}}_4^{-} + {\mathrm{NH}}_4^{+}\left(\mathrm{aq}\right)$

• The equilibriumlies mostly to the right

• The equilibrium lies mostly to the left

• The equilibrium is exactly in between where the concentration of each of the reactants is exactly equal to the concentration of each of the products

• The equilibrium depends on the temperature of the equilibrium reaction

Which of the following represents the correct pH of a 10^-7 M HCl in doubly distilled air-free water?

• 6.6990

• 7.0000

• 7.3010

• 6.3980

Silver metal is recovered industrially by using the chemistry shown below. Which of the following statements is/are not true?

2K[Ag(CN)₂] +Zn→ K₂[Zn(CN)₄] + 2Ag

• only Ag has been oxidised and Zn reduced

• (a), (c), (d)

• Both Ag and Zn have been oxidised

• Both Ag and Zn have been reduced

An alkyl bromide is formed as the major product on reaction of 3-methyl-2-butene with hydrobromic acid under thermodynamic conditions. Which of the following is the correct IUPAC name of this product?

• 2-bromo-3-methylbutane

• 1-bromo-3-methylbutane

• 2-bromo-2-methylbutane

• 1-bromo-3-methyl-2-butene

Which of the following represents the correct increasing order of electron pair availability on nitrogen based on hyperconjugation and + I and-I effects arising from alkyl groups?

• iv < iii < ii< i

• iv <i <iii< ii

• i< ii< iii< iv

• i<iv <iii < ii

Which one of the following represents the major product of the reaction of benzene with 2, 2-dimethylpropyl chloride in presence of anhydrous aluminium chloride?

• 2, 2-dimethylpropylbenzene

• 1, 1-dimethylpropylbenzene

• 1, 2-dimethylpropylbenzene

• 1, 2-dimethyl-1-propenylbenzene