Lewis Dot Structure

Q. 43. A : 30% solution of H2O2 is marketed as 100 volume hydrogen peroxide. R : 1 ml of 30% H2O2 solution will give 100 ml of oxygen at STP. why reason is not the correct explanation?

Q. The valency of $S$ in Sulphuric acid $\left(H_{2}S{O}_4\right)$ is:

1. 2
2. 8
3. 4
4. 6

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

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

Q. The d-electron configuration of $C{r}^{2+},M{n}^{2+},F{e}^{2+}\text{and}C{o}^{2+}$ are $d^4$, $d^5$, $d^6$ and $d^7$ respectively. Which one of the following will exhibit minimum paramagnetic behaviour? (Atomic number of Cr=24, Mn=25, Fe =26, Co=27)

1. $M{n}^{2+}$

2. $F{e}^{2+}$

3. $C{o}^{2+}$

4. $C{r}^{2+}$

Q. which of the following can show resonance? give reason 1.CH2=CH-CH=CH2 2. CH2=CH-CHO 3.CH2=CH-NH2 4. All of these

Q. 42 Which is a polar molecule? 1) XeF4 2) BF3 3) I2Cl6 4) PCl2F3

Q.

Which of the following does not have peroxy bond?

1. BaO₂

2. CrO₅

3. H₂TiO₄

4. PbO₂

Q. What is the acidity order of oxoacids of sulphur

Q. 33. Titanium crystallizes in a fcc lattice . It reacts with carbon or hydrogen interstitially by allowing atoms of these elements to occupy holes in the host lattice . Hydrogen occupies tetrahedral holes but carbon occupies octahedral holes the formula of titanium carbide and hydride are

Q. A sodium cation has different number of electrons from

1. O^2-

2. F^-

3. Li⁺

4. Al⁺³

Q. 78.Which of the following is an electron deficient compound? A) B2H6 B)CO2 C)NaBH4 D)Al2Cl6

Q. 32.an Ion which has 18 electrons in the outermost shell is a)) K (1) positive b)) Cu (1)positive C)) Cs (1)positive D)) both b and c Here (1)positive is charge on atom

Q.

The oxygen family is also known as:

1. peroxo family

2. halogen family

3. chalcogen family

4. oxo family

Q.

Highest dipole moment is present in ______

1. trans - 2 - pentene

2. Cis 3 - hexene

3. 2, 2, 3, 3 - tetramethyl butane

4. 2, 2 - dimethyl propane

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

Q. 33. Which of the following pairs will not form a coordinate covalent bond with each other ? 1.NH_3 & BF_3 2.AlCl_3 & AlCl_3 3.CH_4 & AlCl_3 4.BF_3 & HF

Q. Which of the compound has 3^° carbon atom?

Q. 10. Derive the relationship between the radius (r) of the octahedral void and radious (R) of the atoms in close packing

Q. 48. How to write the structural formula for propene

Q. In which of the following molecule/ion all the bonds are not equal? (1) XeF4 (2) BF4-1 (3) C2H4 (4) SiF4

Q. What is chemical bond

Q. calculate the number of ions , number of oxygen atom and total charge in 3 gm CO_3^{2-

Q. What is the symbol used for electronegativity

Q. Difference between nascent occluded and atomic hydrogen and normal hydrogen

Q. 47. Which is more covalent MgO or nacl

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

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

Q.

The number of dots in the Lewis symbol represents:

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. 7.In which of the following molecules/ions or all the bonds not equal- 1) XeF4 2) BF4- 3) SF4 4) SiF4

Q.

what are the limitation of octet rule with example and reason?