Tests for Sulphuric Acid

Q. On addition dilute HCl acid to copper oxide powder , the solution form is blue green .
Predict the new compound formed which imparts blue green colour of solution ? Write it's equation

Q. The colour of potassium dichromate upon reaction with sulphuric acid changes from__

1. Orange to Green.
2. Green to Orange
3. Blue to Green
4. Yellow to Green

Q.

What is the color of Potassium dichromate?

1. Orange

2. Red

3. Blue

4. Colourless

Q. Give two important uses of washing soda and baking soda.

Q. What is the name of the white precipitate formed as a product in the Barium Test for sulphuric acid?

1. Barium Sulphate
2. Barium Sulphide
3. Barium Chloride
4. Barium Nitrate

Q. From the list given below, select the word(s) required to correctly complete the blanks (i) to (v) in the following passage:
Note: words chosen from the list are to be used only once. Write only the answers. Do not copy the passage. [reddish brown, ammonium, nitrogen dioxide, hydroxyl, dirty green, ammonia, acidic, alkaline]
Nitrogen and hydrogen combine in the presence of a catalyst to give (i) ________ gas. When the above mentioned gas is passed through water it forms a solution which will be (ii) ________ in nature and the solution contains (iii) ______ ions and (iv) _______ ions. The above solution when added to iron (II) sulphate solution gives a (v) _______ coloured precipitate of iron (II) hydroxide.

Q.

Give a chemical test to distinguish between :

(a) dilute sulphuric acid and dilute hydrochloric acid,

(b) dilute sulphuric acid and conc. sulphuric acid.

Q.

Barium sulphate is soluble in all mineral acids.

1. True

2. False

Q.

A gas is released when copper reacts with conc. sulphuric acid. The name of the gas released is

1. Hydrogen sulphide
2. Sulphur dioxide
3. Hydrogen
4. Sulphur trioxide

Q.

The original colour of potassium dichromate is :

1. green

2. orange

3. red

4. blue

Q. When sulphur dioxide is passed through potassium dichromate solution, the colour changes from to .

1. green
2. blue
3. yellow
4. orange
5. pink
6. white

Q.

State one chemical test between each of the following pairs:

Manganese dioxide and copper (II) oxide

Q. One of the following is an incorrect statement, point it out.

1. Permanent hardness can be removed by boiling water
2. Hardness of water effects soap consumption
3. Temporary hardnes is due to bicarbonates of Ca and Mg
4. Permanent hardness is due to the soluble $S{O}_4^{2-}C{l}^{-},N{O}_3^{-}$ of Ca and Mg

Q. State the reason why baking soda is used following cases:

1. as an antacid.
2. as a constituent of baking powder.

Q.

State your observations for the following cases

(ⅰ ) Moist blue litmus is introduced into a gas jar of Sulphur dioxide.

(ⅱ) Dry red rose petals are placed in the jar of Sulphur dioxide.

(ⅱⅰ) Paper soaked in Potassium permanganate solution is introduced in to gas jar of Sulphur dioxide.

Q.

Write the chemical name for the ionic compound $\mathbf{Zn}\mathbf{}{\mathbf{\left(}{\mathbf{NO}}_{\mathbf{3}}\mathbf{\right)}}_{\mathbf{2}}$ and mention its molecular weight in brackets after the name.

Q. How will you distinguish between the two black samples, CuO and MnO₂ with a chemical test?

Q. Match the following tests for sulphuric acid with the result to confirm its presence.

1. Colour change
2. White fumes
3. White precipitate

Q. A gas is released when copper reacts with conc. sulphuric acid. The name of the gas released is:

1. Hydrogen sulphide
2. Sulphur dioxide
3. Sulphur trioxide
4. Hydrogen

Q.

Using dilute sulphuric acid only how will you distinguish between:

Magnesium metal and lead metal.

Q. Which of the following does not use concentrated sulphuric acid as a drying agent during its manufacture?

1. Hydrochloric acid
2. Sulphur dioxide
3. Chlorine
4. Ammonia

Q. Give two important uses of washing soda and baking soda.

Q. The gas liberated on heating a mixture of two salts with $NaOH$, give a reddish brown precipitate with an alkaline solution of $K_{2}Hg{l}_4$. The aqueous solution of the mixture on treatment with $BaC{l}_2$ gives a white precipitate which is sparingly soluble in concentrated $HCl$. On heating the mixture with $K_{2}C{r}_2{O}_7$ and concentrated $H_{2}S{O}_4$, red vapour $\left(A\right)$ are produced. The aqueous solution of the mixture gives a deep blue ppt. $\left(B\right)$ with Potassium ferricyanide solution. Identify the radicals.

1. $\left(A\right)-Cr{O}_{2}C{l}_2,$ $\left(B\right)-F{e}_3\left[Fe\right(CN{)}_6{]}_2$
2. $\left(A\right)-Cr{O}_{2}Cl,$ $\left(B\right)-F{e}_3\left[Fe\right(CN{)}_6{]}_2$
3. $\left(A\right)-Cr{O}_{2}C{l}_2,$ $\left(B\right)-F{e}_2\left[Fe\right(CN{)}_6{]}_2$
4. $\left(A\right)-Cr{O}_{2}Cl,$ $\left(B\right)-F{e}_2\left[Fe\right(CN{)}_6{]}_2$

Q. $KCl+conc.H_{2}S{O}_4+K_{2}C{r}_2{O}_7\stackrel{\Delta }{\to }\left(X\right)\stackrel{NaOH}{\to }\left(Y\right)$,

1. $C{r}_{2}OC{l}_2$, $N{a}_{2}Cr{O}_3$
2. $C{r}_2{O}_{2}C{l}_2$, $N{a}_{2}Cr{O}_3$
3. $Cr{O}_{2}Cl$, $N{a}_{2}Cr{O}_4$
4. $Cr{O}_{2}C{l}_2$, $N{a}_{2}Cr{O}_4$

Q. Distinguish between the following pairs of compounds using the test given within brackets:
Dilute sulphuric acid and dilute hydrochloric acid (using barium chloride solution)

Q.

When $S{O}_2$ reacts with potassium dichromate, the color of the solution changes to

1. white

2. green

3. blue

4. red

Q.

The precipitate which is insoluble in all mineral acids is :

1. barium chloride

2. barium nitrate

3. calcium chloride

4. barium sulphate

Q. A dilute mineral acid, which forms a white precipitate when treated with barium chloride solution is :

1. Dilute nitric acid
2. Dilute sulphuric acid
3. Dilute hydrochloric acid
4. none of these

Q. A colourless mixture of two substances (A) and (B) (excess) is soluble in $H_{2}O$, separately. (A) turns blue litmus red and (B) turns red litmus blue. (A) gives white ppt. with (B), which dissolves in excess of (B) forming (C). (A) when placed in moist air gives fumes and can form dimer. (A) gives white ppt. with ${NH}_{4}Cl$ and ${NH}_{4}OH$ soluble in (B). (A) also gives white precipitate with ${AgNO}_3$ soluble in ${NH}_{4}OH$.

1. Hydrolysis of cation of A
2. Hydrolysis of anion of A
3. Hydrolysis of both cation and anion
4. None of the above is correct

Q. In permanganetic titrations, the indicator used to obtain end point is :

1. phenolphthalein
2. methyl orange
3. methyl Red
4. self indicator