Oxyacids of Phosphorus

Q.

What is the difference between carbocation and carbanion?

Q. Which of the following is a neutral amino acid?

1. Glycine
2. Lysine
3. Arginine
4. Histidine

Q.

The chemical formula of the compound that makes up the tooth enamel is __________.

Q.

The structure of diborane contains:

1. four 2C – 2e bonds and two 3C – 2e bonds

2. two 2C – 2e bonds and four 3C – 2e bonds

3. two 2C – 2e bonds and two 3C – 2e bonds

4. four 2C – 2e bonds and four 3C – 2e bonds

Q.

What is the conjugate of ${\mathrm{H}}_2{\mathrm{SO}}_4$?

Q. In a cyclotrimetaphosphoric acid molecule, how many pi and sigma bonds are present?

1. 3 pi bonds; 15 sigma bonds
2. 3 pi bonds; 12 sigma bonds
3. 3 pi bonds; 9 sigma bonds
4. 6 pi bonds; 6 sigma bonds

Q. What is the formula of the compound formed during Brown ring test of nitrate radical ?

1. $\left[Fe\right(H_{2}O{)}_{4}N{O}^{+}{]}^{2+}$
2. $\left[Fe\right(H_{2}O{)}_{4}NO{]}^{2+}$
3. $\left[Fe\right(H_{2}O{)}_{5}NO]S{O}_4$
4. $\left[Fe\right(H_{2}O{)}_{5}N{O}^{+}{]}^{2+}$

Q.

What is the basicity of ${\mathrm{H}}_3{\mathrm{PO}}_3$?

Q.

What is the equivalent weight of ${\mathrm{H}}_3\mathrm{PO}$ when it disproportionate into ${\mathrm{PH}}_3$ and ${\mathrm{H}}_3{\mathrm{PO}}_3$?

Q. A What are silicones? State the uses of silicones.

B What are boranes? Give a chemical equation for the preparation of diborane.

Q. Which of the following is an acidic amino acid?

1. Lysine
2. Arginine
3. Aspartic acid
4. Histidine

Q.

The number of P-O-P bonds in cyclic metaphosphoric acid is:

1. Two

2. Zero

3. Four

4. Three

Q. Equivalent mass of chlorine molecule in the equation
$3C{l}_2+6NaOH\to 5NaCl+NaCl{O}_3+3H_{2}O$

1. 59.1
2. 42.6
3. 71
4. 35.5

Q. Sodium phenoxide reacts with $C{O}_2$ at $400K$ and $4-7$ atm pressure to give:

1. Sodium salicylate
2. Salicylaldehyde
3. Catechol
4. Benzoic acid

Q. The strong reducing bahaviour of $H_{3}P{O}_2$ is due to:

1. High oxidation state of phosphorus
2. Presence of two $-OH$ groups and one $P-H$ bond
3. Presence of one $-OH$ group and two $P-H$ bonds
4. High electron gain enthalpy of phosphorus

Q. Upon heating $KCl{O}_3$ in the presence of catalytic amount of $Mn{O}_2$, a gas W is formed. Excess amount of W reacts with white phosphorus to give X. The reaction of X with $HN{O}_3$ gives Y and Z.

W and X are, respectively

1. $O_3$ and $P_4{O}_6$
2. $O_2$ and $P_4{O}_6$
3. $O_2$ and $P_4{O}_{10}$
4. $O_3$ and $P_4{O}_{10}$

Q. Which acid has a $P-P$ linkage?

1. Hypophosphoric Acid
2. Pyrophosphoric acid
3. Metaphosphoric acid
4. Pyrophosphorus acid

Q.

Which of the following is a tetrabasic acid?

1. Hypophosphorous acid

2. Metaphosphoric acid

3. Pyrophosphoric acid

4. Orthophosphoric acid

Q.

The formula of microcosmic salt is

Q. Which oxoacid of phosphorous has the highest number of oxygen atoms present in its chemical formula?

1. Pyrophosphoric acid
2. Hypophosphoric acid
3. Pyrophosphorus acid
4. Phosphoric acid

Q.

Assertion: In mono haloarenes, further electrophilic substitution occurs at ortho and para positions.

Reason: Halogen atom is a ring deactivator.

1. Assertion and reason both are correct and reason is the correct explanation of assertion.
2. Assertion is correct but reason is wrong statement.
3. Assertion is wrong but reason is correct statement.
4. Assertion and reason both are correct statements but reason is not correct explanation of assertion.
5. Assertion and reason both are wrong statements.

Q. An equimolar quantities of ethanol and methanol are heated with conc. $H_{2}S{O}_4$. The products formed is/sre:

1. $C_2{H}_{5}O{C}_2{H}_5$
2. $C{H}_{3}OC{H}_3$
3. $C_2{H}_{5}OC{H}_3$
4. all of these

Q.

Interhalogen compounds are covalent due to___________.

Q. The number of P – H bonds in hypophosphorous acid is

1. 2
2. 3
3. 4
4. 1

Q. Which of the following structures is pyrogallol?

1. 
2. 
3. 
4. 

Q.

The basicity of Sulphurous acid is:

1. 2

2. 5

3. 3

4. 4

Q.

How do you explain the amphoteric behaviour of amino acids?

Q. 43 Which one is more acidic and why? 1) Formic acid 2) Phenyl acetic acid

Q. How many of the given solvents favour $E2$ mechanism?
(i) DMSO (ii) Ethanol (iii) Acetone (iv) Water

Q. Which is more basic oxygen in an ester

1. None of the oxygen atoms is basic
2. O denoted by $\alpha$
3. O denoted by $\beta$
4. Both equally