Periodicity

Q. The electronic configuration of an element is $1s^2$ $2s^2$ $2p^6$ $3s^2$ $3p^4$. The atomic number and the group number of element 'X' (which is just below the said element in the periodic table) respectively are:

1. 24 & 6
2. 34 & 6
3. 24 & 16
4. 34 & 16

Q. Identify the incorrect statement(s).

1. Fluorine is the most electronegative element and has the highest electron affinity
2. The order of electron affinity for group 16 is $S>O>Se>Te>Po$
3. Non metallic character and electronegativity follow the same trend across a period
4. Magnitude of electron gain enthalpy and ionization energy follow opposite trends on moving down the group.

Q.

An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent halide.

Where in the periodic table are elements X and Y placed?

Q. Match the electronic configurations of the elements given in List - I with their correct characteristic(s) (i.e., properties for given configuration) given in List - II.
$\begin{array}{cccc}& \text{List-I}& & \text{List - II}\\ \text{P.}& 1s^2& 1.& \text{Element shows highest negative oxidation state}\\ \text{Q.}& 1s^{2}2s^{2}2p^5& 2.& \text{Element shows highest first ionisation enthalpy}\\ \text{R.}& 1s^{2}2s^{2}2p^{6}3s^{2}3p^5& 3.& \text{Element shows highest electronegativity on Pauling scale}\\ \text{S.}& 1s^{2}2s^{2}2p^2& 4.& \text{Element shows maximum electron gain enthalpy (most exothermic)}\end{array}$

1. $P-4,Q-2,R-3,S-1$
2. $P-2,Q-3,R-4,S-1$
3. $P-2,Q-1,R-3,S-4$
4. $P-1,Q-2,R-3,S-4$

Q. Which of the following element has highest negative electron gain enthalpy?

निम्नलिखित में से किस तत्व की ऋणात्मक इलेक्ट्रॉन लब्धि एन्थैल्पी उच्चतम है?

1. F
2. Br
3. Cl
4. I

Q. Which of the following is not true about anhydrous aluminium chloride?

1. It does not exist as $AlC{l}_3$ molecules in solid state
2. On hydrolysis $AlC{l}_3$ gives $AlC{l}_3.3H_{2}O$
3. The rate of sublimation of $AlC{l}_3$ increases with increase in temperature
4. It is a strong Lewis acid

Q. Decreasing order of first ionization energy is

1. N>P>As>Bi>Sb
2. N>P>As>Sb>Bi
3. N>P>As>Sb=Bi
4. N>P>Sb>As>Bi

Q. What will be the IUPAC nomenclature of the element placed just below the element $At$.
Atomic number of At = 85

1. Ununennium
2. Ununseptium
3. Ununoctium
4. Ununhexium

Q. Which one is not true about carbides?

1. $A{l}_4{C}_3$ is methanide and produces methane on hydrolysis
2. $M{g}_2{C}_3$ is propylide and produces propane on hydrolysis
3. $Ca{C}_2$ and $N{a}_2{C}_2$ are acetylides and they produce acetylene on hydrolysis
4. $B{e}_{2}C$ gives methane on hydrolysis

Q. The electronic configuration of an element is $1s^2$ $2s^2$ $2p^6$ $3s^2$ $3p^4$. The atomic number and the group number of element 'X' (which is just below the said element in the periodic table) respectively are:

1. 24 & 6
2. 34 & 6
3. 24 & 16
4. 34 & 16

Q. Which of the following is not true about anhydrous aluminium chloride?

1. It does not exist as $AlC{l}_3$ molecules in solid state
2. On hydrolysis $AlC{l}_3$ gives $AlC{l}_3.3H_{2}O$
3. The rate of sublimation of $AlC{l}_3$ increases with increase in temperature
4. It is a strong Lewis acid