Preparations and Uses of Caustic Soda

Q. Write a balanced chemical reaction and give your observation when the following metals react:
Calcium with cold water

Q. Write a balanced chemical reaction and give your observation when the following metals react:
Magnesium with boiling water

Q.

62. What is the action of heat on the following?

(a) ammonium hydroxide

Q. Write the balanced equations for the following:
Iron reacts with dil. HCl

Q. Write a balanced chemical reaction and give your observation when the following metals react:
Sodium with cold water

Q. Limewater turns milky when _____ gas is passed through it.

1. carbon dioxide
2. oxygen
3. hydrogen
4. chlorine

Q. Which two sets of reactants best represent the amphoteric character of $Zn{\left(OH\right)}_2$?
Set 1: $Zn{\left(OH\right)}_2\left(s\right)$ and ${OH}^{-}\left(aq\right)$
Set 2: $Zn{\left(OH\right)}_2\left(s\right)$ and $H_{2}O\left(l\right)$
Set 3: $Zn{\left(OH\right)}_2\left(s\right)$ and $H^{+}\left(aq\right)$
Set 4: $Zn{\left(OH\right)}_2\left(s\right)$ and ${NH}_3\left(aq\right)$

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

Q. Limewater turns milky when _____ gas is passed through it.

1. hydrogen
2. chlorine
3. carbon dioxide
4. oxygen

Q. The molecular mass of sodium carbonate is

सोडियम कार्बोनेट का आणविक द्रव्यमान है

1. 83 u
   
2. 83 g
   
3. 106 u
   
4. 106 g
   

Q. $C{l}^{-}-e^{-}\to Cl$ occurs at __________ and
$Cl+Cl\to C{l}_2$ occurs at ___________.

1. anode, cathode
2. cathode, cathode
3. anode, anode
4. cathode, anode

Q. What happen when?
Silver chloride is treated with excess of ammonium hydroxide.

Q. Identify D and E in the following :

1. $D:(N{H}_4{)}_{2}C{r}_2{O}_{7}E:C{r}_2{O}_3$
2. $D:(N{H}_4{)}_{2}C{r}_2{O}_{7}E:C{r}_2{O}_2$
3. $D:\left(N{H}_4\right)C{r}_2{O}_{7}E:C{r}_2{O}_3$
4. $D:\left(N{H}_4\right)C{r}_2{O}_{7}E:C{r}_2{O}_2$

Q. Why are the following metals not used in the lab preparation of hydrogen: ​
Calcium?​

Q.

Which of the following metal oxide is referred as rust?

1. Cuprous oxide

2. Ferric oxide

3. Cupric oxide

4. Ferrous oxide

Q.

Which of the following metal oxide is referred as rust?

1. Ferric oxide

2. Ferrous oxide

3. Cuprous oxide

4. Cupric oxide