Question 4 :
An atom with atomic number 20 is most likely to combine chemically with the atom whose atomic number is:

Question 6 :
The maximum number of valence electrons possible for atoms in the second period of the periodic table is :

Question 9 :
In which of the following crystals of ionic compounds would you expect maximum distance between the centres of cations and anions

Question 10 :
Magnetic nature of {tex} \mathrm { C } _ { 2 } {/tex} molecule will be:-

Question 15 :
The work done in ergs for the reversible expansion of one mole of an ideal gas from a volume of 10 litres to 20 litres at is

Question 19 :
Which of the following statements is true? The entropy of the universe

Question 20 :
Which of these is least likely to act as a Lewis base?

Question 21 :
The ratio {tex} \frac { K _ { p } } { K _ { c } } {/tex} for the reaction is; {tex} \mathrm { CO } ( g ) + \frac { 1 } { 2 } \mathrm { O } _ { 2 } ( g ) \rightleftharpoons \mathrm { CO } _ { 2 } ( g ) {/tex} is

Question 22 :
At a certain temperature, only {tex} 50 \% {/tex} {tex} \mathrm {HI} {/tex} is dissociated into {tex} \mathrm { H } _ { 2 } {/tex} and {tex} \mathrm { I } _ { 2 } {/tex} at equilibrium. The equilibrium constant is:

Question 23 :
At a certain temperature the dissociation constants of formic acid and acetic acid are {tex} 1.8 \times 10 ^ { - 4 } {/tex} and {tex} 1.8 \times 10 ^ { - 6 } {/tex} respectively. The concentration of acetic acid solution in which the hydrogen ion has the same concentration as in {tex} 0.001 \mathrm { M } {/tex} formic acid solution is equal to

Question 24 :
The solubility product of {tex} \mathrm { Ag } _ { 2 } \mathrm { CrO } _ { 4 } {/tex} is {tex} 32 \times 10 ^ { - 12 } {/tex}. What is the concentration of {tex} \mathrm { CrO } _ { 4 } ^ { 2 - } {/tex} ions in that solution in {tex} \left( \mathrm { g } \mathrm { L } ^ { - 1 } \right) {/tex}

Question 29 :
Which among the following statements is correct with respect to the optical isomers?