Identification Test for Salts

Q. CaCO3 + H2O

Q.

Compound A is a white crystalline solid. When heated it leaves a yellow residue of compound B, a reddish brown gas C, and another gas D. When compound A is dissolved in water and treated with dilute hydrochloric acid, a white precipitate E is formed and dissolves on boiling. Identify A, B, C, D, and E and explain the reaction.

Q.

Which among the following statements are correct for magnesium metal?

1. It burns in oxygen with a dazzling white flame.

2. It does not reacts with oxygen.

3. It reacts with hot water to form Magnesium hydroxide and evolves hydrogen gas.

4. It reacts with steam to form Magnesium hydroxide and evolves hydrogen gas.

Q.

What is the role of blue glass in the flame test?

Q.

Is phosphate a polyatomic ion

Q.

What four chemical properties examples would you give?

Q. How will you distinguish among sodium chloride, potassium chloride and calcium chloride ?

Q.

. Tick the most appropriate answer.

Sodium burns in oxygen with a flame which is:

1. brick red in colour

2. golden yellow in colour

3. blue in colour

4. crimson in colour

Q.

Which of the following ions is mono-atomic?

1. Sulphite

2. Sulphide

3. Nitrate

4. Hydroxide

Q. Match the following processess with their uses in the preparation of the following compounds/substances.

1. Ammonia
2. Vegetable oils
3. Water

Q.

What is the brown ring in a brown ring test?

Q. Which of these reactions releases hydrogen gas?

1. $Na+HCl\to$
2. $N{a}_{2}C{O}_3+HCl\to$
3. $NaHC{O}_3+HCl\to$
4. $NaOH+HCl\to$

Q. Which of the following cations gives colourless (white) flame?

1. Magnesium
2. Calcium
3. Potassium
4. Barium

Q. If the colour of the flame obtained by performing the flame test of a substance with the help of platinum wire and concentrated $HCl$ is violet, then the basic radical in the salt is :

1. calcium
2. barium
3. sodium
4. potassium

Q. Which cation is detected by the flame test ?

1. $N{H}_4^{+}$
2. $K^{+}$
3. $A{l}^{3+}$
4. $M{g}^{2+}$

Q. Which is the volatile compound burning with green flame?

1. $(C_2{H}_5{)}_3{BO}_3$
2. $(C_2{H}_5{)}_{3}B$
3. ${Ba\left({NO}_3\right)}_2$
4. ${BaCl}_2$

Q. Sodium chloride imparts blue flame to bunsen flame.

1. True
2. False

Q. Which of the following cation cannot be identified by flame test?

1. ${Na}^{+}$
2. $K^{+}$
3. ${Ba}^{2+}$
4. ${Mg}^{2+}$

Q. Which of the following compounds imparts red colour to the flame and decomposes on heating to give oxygen and a brown gas?

1. $CaC{O}_3$
2. $MgN{O}_3$
3. $MgC{O}_3$
4. $Ca(N{O}_3{)}_2$

Q. State the inference drawn from the following observations:
On carrying out the flame test with a salt $P$ a brick red flame was obtained. What is the cation in $P$?

Q. The incorrect statement among the following for magnesium metal is:

1. it burns in oxygen with dazzling white flame
2. it reacts with hot water to form magnesium hydroxide and evolves hydrogen gas
3. it reacts with steams to form magnesium hydroxide and evolves hydrogen gas
4. tt reacts with cold water to form magnesium oxide and evolves hydrogen gas

Q. Which metal gives golden yellow color in flame test?

1. $K^{+}$
2. $N{a}^{+}$
3. $P$
4. $C{l}^{-}$

Q.

13. How will you identify oxygen in the laboratory?

Q.

6. Characteristic reactions for four different substances are given below. Arrange the tests in the order of the substances given below.

(i) ${\mathrm{P}}_2{\mathrm{O}}_5$

(ii) ${\mathrm{CO}}_2$

(iii) ${\mathrm{O}}_2$

(iv) ${\mathrm{SO}}_2$

1. Passage through potassium dichromate turns green.
2. Dissolution in water gives a tribasic acid.
3. Non-supporter of combustion but allows active metals continue to burn.
4. Turns alkaline pyrogallol brown.

1. 2431

2. 2341

3. 4132

4. 4312

Q. Which of the following cations is detected by the flame test?

1. ${N{H}_4}^{+}$
2. ${Mg}^{2+}$
3. ${Al}^{3+}$
4. $K^{+}$

Q. Salts are formed as a result of___reaction

1. Combustion reaction
2. Precipitation reaction
3. Decomposition reaction
4. Neutralization reaction

Q. Calcium compound gives which color in flame test ?

1. Lilac
2. Blue
3. Brick red
4. Golden yellow

Q. A chloride dissolves appreciably in cold water. When placed on a platinum wire in Bunsen flame no distinctive colour is noticed, the cation would be?

1. $M{g}^{2+}$
2. $P{b}^{2+}$
3. $B{a}^{2+}$
4. $C{a}^{2+}$

Q. $Be$ and $Mg$ do not impact colour to flame due to :

1. very high ionisation energy
2. high ionic potential
3. their greater covalent character
4. All of the above