Lewis Dot Structure

Q. The tendency of $B{F}_3,BC{l}_3$ and $BB{r}_3$ to behave as Lewis acid decreases in the sequence

1. $B{F}_3>BC{l}_3>BB{r}_3$
2. $BC{l}_3>B{F}_3>BB{r}_3$
3. $BB{r}_3>BC{l}_3>B{F}_3$
4. $BB{r}_3>B{F}_3>BC{l}_3$

Q. The total number of lone pair present in the molecule $Xe{F}_4$ is:

1. 10
2. 12
3. 14
4. 16

Q.

In diamond, carbon atom occupy FCC lattice points as well as alternate tetrahedral voids. If edge length of the unit cell is 356 pm, then radius of carbon atom is

1. 77.07 pm

2. 251.7 pm

3. 89 pm

4. 154.14 pm

Q. In $N{O}_3^{-}$ ion, the number of bond pair and lone pair of electrons present on nitogen atom is:

1. 3, 1
2. 2, 2
3. 1, 3
4. 4, 0

Q. What is dragos rule . Explain with an example in detail

Q.

What are electron-rich hydrides?

Q. What isn1°, 2°, 3° and 4° of hydrocarbons

Q.

How do we calculate the number of electrons in a compound ?

Q.

Why is ${\mathrm{NO}}_2^{+}$ an electrophile?

Q.

Write Lewis dot symbols for atoms of the following elements: Mg, Na, B, O, N, Br.

Q. Aluminium(III) chloride forms a dimer because aluminium:

1. Belongs to $3^{rd}$ group
2. Can have higher coordination number
3. Cannot form a trimer
4. Has high ionization energy

Q.

Draw the electron dot structure of ${\mathrm{H}}_2$?

Q.

Which of the following species is not expected to be a ligand?
(a) NO
(b) $N{H}_4^{+}$
(c) $N{H}_{2}C{H}_{2}C{H}_{2}N{H}_2$
(d) CO

Q.

Draw the electron dot structure of ethene, ${\mathrm{C}}_2{\mathrm{H}}_4$ ?

Q. In $Fe(CO{)}_5$, the Fe - C bond possesses

1. $\sigma$ character only
2. Cannot be predicted
3. $\pi$ character only
4. Both $\sigma$ and $\pi$ character

Q. Which of the following species contains three bond pairs and one lone pair around the central atom?

1. $N{H}_2^{-}$
2. $PC{l}_3$
3. $H_{2}O$
4. $B{F}_3$

Q. Which of the following is the most stable structure for $N_{2}O$?

1. 
2. 
3. 
4. All of the above

Q. Difference between monovalent atom and divalentv atoms

Q.

The correct order of bond lengths for $\mathrm{C}-\mathrm{C}$ bonds in benzene, ethyne, ethene and ethane is

Q. limiting conduc†an ces of ca2+ and cl- ions are 119 and 76.3 Scm^2 eq-1 respectively.The molar conductivity of cacl2 ids

Q.

What is the valency of acetic acid?

Q. what is the lewis dot structure of lithium?

Q. The number of paired and unpaired electrons in the Lewis symbol for $S$ atom is:

1. 2, 2
2. 4, 2
3. 2, 4
4. 0, 6

Q. does aluminium react with water

Q.

What are the Group A elements called?

Q. Which of the following does not obey the octet or duplet rule?
$\left(i\right)H_{2}O\left(ii\right)B{F}_3\left(iii\right)PC{l}_5\left(iv\right)C{O}_2\left(v\right)N{H}_3$

1. $\left(i\right),\left(ii\right),\left(iii\right)$
2. $\left(ii\right),\left(iii\right),\left(iv\right)$
3. $\left(ii\right),\left(iii\right)$
4. $\left(i\right),\left(iv\right),\left(iii\right)$

Q.

Use Lewis symbols to show electron transfer between the following atoms to form cations and anions: (a) K and S (b) Ca and O (c) Al and N.

Q. The $t_{1/2}$ of a reaction is doubled as the initial concentration of the reactant is doubled. What is the order of the reaction?

1. Zero order
2. First order
3. Second order
4. Third order

Q.

Write Lewis symbols for the following atoms and ions: S and S2– ; Al and Al3+; H and H–

Q. For a certain reaction $A\to P$, the half life for different initial concentrations of $A$ is mentioned below.

$A_o$	0.1	0.025
$t_{\frac{1}{2}}$	100	50

Which of the following option(s) is / are incorrect.

1. The order is $1$
2. The order is $0.5$
3. For $\left[A_o\right]=1M,t_{\frac{1}{2}}=100\sqrt{10}\text{sec}$
4. For $\left[A_o\right]=1M,t_{\frac{1}{2}}=100\text{sec}$