introduction

Q. The reaction of $HCl{O}_3$ with $HCl$ gives a paramagnetic gas, which upon reaction with $O_3$ produces

1. $Cl{O}_2$
2. $C{l}_2{O}_6$
3. $C{l}_2{O}_7$
4. $C{l}_{2}O$

Q.

Why is nitric acid added to sodium extract before adding silver nitrate for testing halogens?

Q. Stability of tetrabromides follows the order :

1. ${SeBr}_4<{TeBr}_4<{PoBr}_4$
2. ${SeBr}_4<{PoBr}_4<{TeBr}_4$
3. ${PoBr}_4<{TeBr}_4<{SeBr}_4$
4. None of the these

Q. Elements with atomic numbers 9, 17, 35, 53 are collectively known as:

1. chalcogens
2. halogens
3. lanthanides
4. rare gases

Q. The electron affinity values for the halogens show the following trends

1. $F<Cl>Br>I$
2. $F<Cl<Br<I$
3. $F>Cl>Br>I$
4. $F<Cl>Br<I$

Q. Which of the following belongs to the halogen family?

1. Francium
2. Polonium
3. Radium
4. Astatine

Q. Which of the following chalcogen does not make bonds with germanium?

1. Sulfur
2. Selenium
3. Tellurium
4. Polonium

Q. Describe the following :
Chemistry of Lassaigne's test for the detection of halogens in an organic compound

Q. Which of the following alkyl halides is used as a methylating agent?

1. $C_2{H}_{5}Br$
2. ${CH}_{3}Cl$
3. $C_6{H}_{5}Cl$
4. $C_2{H}_{5}Cl$

Q. A white solid imparts a violet colour to a Bunsen flame. On being heated with concentrated $H_{2}S{O}_4$, the solid gives violet vapours that turns starch paper blue. The salt may be :

1. NaI
2. KI
3. $CaB{r}_2$
4. $Mg{I}_2$