11.

Which of the following is correct?

• Radius of Ca²⁺ <Cl^- < S^2-

• Radius of  <Cl^- < S^2- < Ca²⁺

• Radius of S^2-= Cl^-= Ca²⁺

• Radius of Ca²⁺ >Cl^- > S^2-

CO is practically non-polar since

• the -electron drift from C to O is almost nullified by the $\mathrm{\pi }$-electron drift from O to C

• the $\mathrm{\sigma }$-electron drift from O to C is almost nullified by the $\mathrm{\pi }$-electron drift from C to O

• the bond moment is low

• there is a triple bond between C and O

The state of hybridization of the central atom and the number of lone pairs over the central atom in POCl₃ are

• sp,0

• sp², 0

• sp³, 0

• dsp², 1

20 mL 0.1 (N) acetic acid is mixed with 10 mL 0.1(N) solution of NaOH. The pH of the resulting solution is (pK_a of acetic acid is 4.74)

• 3.74

• 4.74

• 5.74

• 6.74

Which of the following is correct?

• Evaporation of water causes an increase in disorder of the system

• Melting of ice causes a decrease in randomness of the system

• Condensation of steam causes an increase in disorder of the system

• There is practically no change in the randomness of the system when water is evaporated

If the first ionization energy of H atom is 13.6 eV, then the second ionization energy of He atom is

• 27.2 eV

• 40.8 eV

• 54.4 eV

• 108.8 eV

The weight of oxalic acid that will be required to prepare a 1000 mL (N/20) solution is

• 126/100 g

• 63/40 g

• 63/20 g

• 126/20 g

In 2-butene, which one of the following statements is true?

• C₁-C₂ bond is a sp³- sp³- $\mathrm{\sigma }$-bond

• C₂- C₃ bond is sp³ - sp²- $\mathrm{\sigma }$-bond

• C₁- C₂ bond is a sp³ - sp² - $\mathrm{\sigma }$-bond

• C₁- C₂ bond is a  sp²- sp²- $\mathrm{\sigma }$-bond 

The well known compounds, ( +) - lactic acid and (-) - lactic acid, have the same molecular formula, C₃H₆O₃. The correct relationship between them is

• constitutional isomerism

• geometrical isomerism

• identicalness

• optical isomerism

The stability of Me₂C=CH₂ is more than that of MeCH₂CH=CH₂ due to

• inductive effect of the Me groups

• resonance effect of the Me groups

• hyperconjugative effect of the Me groups

• resonance as well as inductive effect of the Me groups