The ratio of $\mathrm{\sigma } / \mathrm{\pi } \mathrm{bond}$ in tetracyano ethylene is: 

(1) 2:1

(2) 1:1

(3) 1:2 

(4) none of these 

Which of the following statement is correct in the context of the allene molecules, $C_3{H}_4$?

1. The central carbon is Sp hybridized

2. The terminal carbon atoms are $s{p}^2$ hybridized

3. The planes containing the $C{H}_2$ groups are  mutually perpendicular to permit the formations of two separate $\pi$ - bonds 

4. All are correct 

The shape of $\mathrm{Xe}{{\mathrm{F}}_3}^{+}$ is:

Which of the following shape are not possible for possible value of 'n' in $XeFn$ molecule?

(1) Linear 

(2) Square planar 

(3) Trigonal planar

(4) Capped octahedral

Which of the following compound has a maximum "C$—$C" single bond length?

1. CH₂CHCCH        
2. HCCCCH  
3. CH₃CHCH₂        
4. CH₂CHCHCH₂

$BeC{l}_2$ is not isostructural with :

(1)$IC{l_2}^{-}$

(2) $C_2{H}_2$

(3) $Xe{F}_2$

(4) $GeC{l}_2$

Minimum $\mathrm{F}—\mathrm{S}—\mathrm{F}$ bond angle present in:

1. ${\mathrm{SSF}}_{2 }$                                                     

2. ${\mathrm{SF}}_6$

3. ${\mathrm{SF}}_2$                                                       

4. ${\mathrm{F}}_3\mathrm{SSF}$

$Sb{F}_5$ reacts with $Xe{F}_4$ and $Xe{F}_6$ to form ionic compounds $\left[Xe{F_3}^{+}\right]$ $\left[Sb{F_6}^{-}\right]$ and $\left[Xe{F_5}^{+}\right]$ $\left[Sb{F_6}^{-}\right]$ then molecular shape of $\left[Xe{F_3}^{+}\right]$ ion and $\left[Xe{F_5}^{+}\right]$ ion respectively :

(1) Square pyramidal, T-shaped 

(2) Bent T-shape, Square pyramidal

(3) See- saw , square pyramidal 

(4) Square pyramidal , See-saw

In which of the following species maximum atom can lie in same plane? 

1. XeF₂O₂

2. $PC{l}_5$

$\mathrm{3.\; A}s{H_4}^{+}$

4. $Xe{F}_4$

The geometry of ammonia molecule can be best described as:

(1) Nitrogen at one vertex of a regular tetrahedron, the other three vertices being occupied by three hydrogens 

(2) Nitrogen at the centre of the tetrahedron, three vertics being occupied by three hydrogens

(3) Nitrogen at the centre of an equilateral triangle, three corners being occupied by three hydrogens 

(4) Nitrogen at the junction of a T, three open ends being occupied by three hydrogens