Carbonic Acid and Carbonates

Q. buffer system maintains the pH level of human blood.

1. Bicarbonate
2. Sodium borate
3. Phosphate

Q.

Which of the carbonates given below is unstable in air and is kept in $C{O}_2$ atomosphere to avoid decomposition?
(a) $BeC{O}_3$ (b) $MgC{O}_3$ (c) $CaC{O}_3$ (d) $BaC{O}_3$

Q.

The correct sequence of thermal stability of the following carbonates is:

1. ${\mathrm{BaCO}}_3<{\mathrm{CaCO}}_3<{\mathrm{SrCO}}_3<{\mathrm{MgCO}}_3$

2. ${\mathrm{MgCO}}_3<{\mathrm{CaCO}}_3<{\mathrm{SrCO}}_3<{\mathrm{BaCO}}_3$

3. ${\mathrm{BaCO}}_3<{\mathrm{SrCO}}_3<{\mathrm{CaCO}}_3<{\mathrm{MgCO}}_3$

4. ${\mathrm{MgCO}}_3<{\mathrm{SrCO}}_3<{\mathrm{CaCO}}_3<{\mathrm{BaCO}}_3$

Q. Which of the following does exist ?

1. $HF{O}_2$
2. $HCl{O}_2$
3. $HBr{O}_2$
4. $HI{O}_2$

Q.

Fusion mixture is

Q. buffer system maintains the pH level of human blood.

1. Bicarbonate
2. Sodium borate
3. Phosphate

Q. The temporary hardness of water is due to _________ salts of calcium and magnesium

1. bicarbonates only
2. carbonates and hydrogen carbonates
3. chloride and bicarbonates
4. chlorides and sulphates

Q.

The anhydride of carbonic acid is:

1. $CO$

2. $C{O}_2$

3. $C_3{O}_2$

4. $\text{None of these}$

Q. The temporary hardness of water due to calcium bicarbonate can be removed by adding:

1. $CaC{O}_3$
2. $Ca(OH{)}_2$
3. $CaC{l}_2$
4. $HCl$

Q. Which one from the following given statements is true:
(I) Sodium carbonate can be prepared by Solvay process.
(II) Crystals of sodium hydroxide are deliquescent.
(III) $NaHC{O}_3$ is a mild antiseptic for skin infections.
(IV) Dead burnt plaster is hemihydrate of calcium sulphate.
(V) $CaC{O}_3$ is used in manufacturing of high quality paper.

1. Four
2. Three
3. Two
4. One

Q. Using $N{a}_{2}C{O}_3$, both temporary and permanent hardness can be removed.
If this is true enter 1, if false enter 0.

Q. The useful by-product, obtained in the Solvay process of manufacture of sodium carbonate, are

1. $Quicklime$ and $C{O}_2$
2. $NaHC{O}_3$ and $N{H}_{2}Cl$
3. $N{H}_{2}C{O}_3{H}_{2}O$
4. $N{a}_{2}C{O}_3$

Q.

The anhydride of carbonic acid is:

1. $CO$

2. $C{O}_2$

3. $C_3{O}_2$

4. $\text{None of these}$

Q.

$C{O}_2+H_{2}O\rightleftharpoons$ ?

1. Cyanogen

2. Cyanide

3. Calcium Cyanamide

4. None of these

Q. Assertion :pH of blood does not change inspite of taking acidic foods. Reason: Blood behaves as buffer solution.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q. Which gas is the acid anhydride of carbonic acid?

1. $C{O}_2$
2. $CO$
3. $S{O}_2$
4. $S$

Q. Fluorine decomposes cold water to give:

1. $HF$ only
2. $4H^{+}+4F^{-}and{O}_2$
3. $HF$ and $H_2$
4. $H_2{F}_{2}andHF{O}_4$

Q.

Which of the following can be a method of preparation of a carbonate?

1. By passing through an alkali

2. By reacting basic oxides and

3. By precipitation from heavy metal carbonates

4. None of these

Q. Which of the following cation gives blood red colour with $KCNS$?

1. ${Ni}^{2+}$
2. ${Fe}^{2+}$
3. ${Fe}^{3+}$
4. None of the above

Q. Aniline on heating with fuming sulphuric acid gives:

1. Aniline disulphate
2. Aniline-$2,4$-disulphonic acid
3. Sulphanilic acid
4. Aniline sulphate

Q. The solution of carbon dioxide in water is called carbonic acid.

1. True
2. False

Q.

The anhydride of carbonic acid is:

1. $CO$

2. $C{O}_2$

3. $C_3{O}_2$

4. $\text{None of these}$

Q. Dilute acetic acid was added to the four test tubes containing the following chemicals.
Brisk effervescence was observed in the test tubes) containing :

1. NaOH
2. NaCl
3. $NaHC{O}_3$
4. $N{a}_{2}C{O}_3$

Q.

Fusion mixture is

1. $N{a}_{2}C{O}_3+K_{2}C{O}_3$

2. $N{a}_{2}C{O}_3+NaHC{O}_3$

3. $N{a}_{2}C{O}_3+NaOH$

4. $N{a}_{2}C{O}_3+K_{2}S{O}_4$

Q.

Hybridisation of carbon atom in $C{O}_3^{2-}$ is

1. $s{p}^2$

2. $sp$

3. $s{p}^3$

4. $\text{None of these}$

Q.

Hybridisation of carbon atom in $C{O}_3^{2-}$ is

1. $sp$

2. $s{p}^2$

3. $s{p}^3$

4. $\text{None of these}$

Q. Assertion :Blood is an example of basic buffer. Reason: $pH$ of blood is 7.4

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q. "Permanent hardness is due to dissolved bicarbonates of $C{a}^{2+}$ and $M{g}^{2+}$."
Answer whether the above statement is true or false.
If true enter 1, else enter 0.

Q. Consider the following reaction,
$Phenol\stackrel{Zndust}{\to }X\underset{anhyd.Alc{l}_3}{\overset{C{H}_{3}Cl}{\to }}Y\stackrel{alkalineKMn{O}_4}{⟶}Z$
The product Z is:

1. benzaldehyde
2. benzoic acid
3. benzene
4. toluene

Q.

Hybridisation of carbon atom in $C{O}_3^{2-}$ is

1. $sp$

2. $s{p}^2$

3. $s{p}^3$

4. $\text{None of these}$