Introduction to Qualitative Analysis

Q.

What happens when carbon dioxide is passed through lime water give equation also also also explain by giving the chemical equation as to what would happen if excess of carbon dioxide is passed

Q. Copper reacts with dilute nitric acid and forms copper nitrate, nitric oxide gas and water

Q.

Which of the following salt is basic in nature?

1. Sodium chloride

2. Sodium acetate

3. Potassium nitrate

4. Aluminium chloride

Q.

What is Chemistry in simple words?

Q.

What is the difference between quick line and lime water and what happens when excess CO2 is added to lime water?

Q. what happens when bleaching powder is kept open in air

Q.

Describe an activity with diagram to illustrate that the reaction of metal bicarbonate with acids produce carbon-dioxide gas and process of testing the gas. Write the chemical equation involved in this.

Q.

on passing excess co2 through limewater it first turns milky and then becomes colourless ? and write the chemical reactions

Q. Why lime water turns milky due to formation of white precipitate of calcium carbonate , when carbon dioxide gas is passed through lime water ?

Q.

pH of black coffee?

Q. Why does bleaching powder deturates on exposure to air?

Q.

Name the gas which turns lime water milky.

Q. Which of the following gases can be used to bleach moist blue litmus paper?

1. Hydrogen
2. Ammonia
3. Oxygen
4. Chlorine

Q. Sodium carbonate test is used to detect the presence of _____.

1. Acids
2. Bases
3. Alkalis
4. Salts

Q. Lime water turns milky because of the formation of calcium _____.

1. Oxide
2. Hydroxide
3. Carbonate
4. Bicarbonate

Q.

What happens to blue vitriol when it is reacted with conc. sulphuric acid?

1. Remains the same

2. Changes color to green

3. Blue color changes to white

4. Crystals turns into powder like substance

Q.

Sodium hydroxide is a strong alkali.

1. False

2. True

Q.

1) write the balanced chemical equation for the preparation of bleaching powder. Write the uses( other than bleaching).

Q. Ammonia reacts with conc. hydrochloric acid to form _________ coloured vapours.

1. White
2. Brown
3. Blue-black
4. Purple

Q. When moist starch iodide paper is introduced near ______ gas, its colour changes to blue-black.

1. Hydrogen
2. Ammonia
3. Chlorine
4. Oxygen

Q. zinc reacts with concentrated nitric acid to produce zinc nitrate and nitrogen dioxide and oxygen balance this equation

Q. Why does bleaching powder form a milky solution in water?

Q.

State your observation, when moist starch iodide paper is introduced into chlorine gas.

Q. Hydrogen is combustible and oxygen support for burning. Hydrogen and oxygen give water then why water is not combustible?

Q. Sodium _____ on heating with copper turnings and concentrated sulphuric acid gives coloured gas.

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

Q.

Which of the following gas is a greenish yellow colour which also bleaches?

1. H₂S

2. SO₂

3. SO₃

4. Cl₂

Q.

Sodium hydroxide is added drop by drop to the solution of metallic salts because:

1. Metallic hydroxides precipitated are identified by their distinct colour.

2. Difficult to identify colour of precipitate.

3. It is easy to miss a precipitate.

4. Alkali must be added quickly to the solution of metallic salts.

Q. A weak acid and a strong base react together to form a/an ____ salt.

1. Neutral
2. Common
3. Acidic
4. Basic

Q. Which metal’s salt forms a precipitate with sodium hydroxide but not with ammonium hydroxide?

1. Iron
2. Calcium
3. Sodium
4. Zinc

Q.

Which method would not produce Ammonia gas?

1. Heating concentrated aqueous Ammonia

2. Heating Ammonium Chloride with Calcium Hydroxide

3. Heating Ammonium Sulphate with Sodium Hydroxide

4. Heating Ammonium Sulphate with dilute Hydrochloric Acid