# Q. Which of the following is not correct ?

EAMCETEAMCET 2005Biomolecules

Solution:

## Metal present in $B_{12}$ is Co.

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## 1. An acidic buffer solution can be prepared by mixing the solution of

IIT JEE 1981 Equilibrium

## 2. A mixture of benzaldehyde and formaldehyde on heating with aqueous NaOH solution gives

IIT JEE 2001 Aldehydes Ketones and Carboxylic Acids

## 3. Which of the following solutions will have pH close to 1.0 ?

IIT JEE 1992 Equilibrium

## 4. Acetone is mixed with bleaching powder to give

AFMC 2004 Aldehydes Ketones and Carboxylic Acids

## 5. 75% of a first order reaction was completed in 32 minutes. When was 50% of the reaction completed

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## 6. The radii of $Na^+$ and $Cl^{-1}$ ions are 95 pm and 181 pm respectively. The edge length of NaCl unit cell is

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