Aluminium hydroxide
A VERY SHORT-ANSWER QUESTIONS : Answer in one-word
1. Name the two acids which are present in the food items you enjoy.
2. Which of the following is not an alkali ? Sodium hydroxide, Calcium hydroxide, Aluminium hud
3. Name the indicator which gives green colour in basic solution and magenta colour in acidic sol
4. What causes irritation and swelling after a bee sting ?
5. Which acid is prepared from sulphur ?
B SHORT-ANSWER QUESTIONS : Answer in 10-15 words
1. Write two characteristics of bases.
2. Name two synthetic acid-base indicators.
3. What is meant by neutralisation reaction ? Give one example.
4. What are antacids ?
5. How is the basic soil treated ?
C LONG-ANSWER TYPE QUESTIONS : Answer in 20-25 words
1. What will you observe when : (a) a drop of sodium hydroxide is added to blue litmus ?
(b) a drop of hydrochloric acid is added to China rose indicator ?
(c) a drop of dilute sulphuric acid is added to red-cabbage juice ?
2. An acidic substance is mixed with an equivalent amount of a basic substance.
(a) what is the reaction called ? (b) what are the products formed ?
3. What is the nature of a solution of washing soda ? How will you confirm it?
4. Give two points of difference between an acid and a base.
5. Mention two uses each of the following:
(i) Ammonium hydroxide (ii) Hydrochloric acid (iii) Magnesium hydroxide
D TICK () THE ODD-ONE OUT GIVING REASON
1. Tartaric acid, Acetic acid, Lactic acid, Hydrochloric acid
2. Magnesium hydroxide, Ammonium hydroxide, Antacid, Aluminum hydroxide
3. Turmeric, Yellow colour, Methyl orange, Plant product
4. Acids, Bitter taste, Soapy, Bases, Caustic soda
E DEFINE THE FOLLOWING TERMS
1. Mineral acids
2. Acid-base indicators
3. Natural and synthetic indicators
4. Neutralisation reaction
HOTS HIGHER ORDER THINKING SKILLS : Think and Answer
D
1. The observations made during an experiement are recorded below
Solution
Blue litmus
Reddish Deep Red No change
Red litmus No change No change
Mauve
Blue
Mauve
thes are washed with soap
w Which of these is, . Strongly acidic Weakly acidic Neutra
(ID Which of the two solutions will react to
we two solutions will react to illustrate the neutralisation reaction ?
e stains turn red when such clothes are washed
• Turmeric stains on white clothes are yellow. These stains turn rew
Give reason for it.
Answers
Answer:
Explanation:
A VERY SHORT-ANSWER
1=Citric acid, oxalic acid, lactic acid.
2= Aluminium hud
3=China rose solution gives dark pink (magenta) colour with acid and green colour with base. Acid Rain: Carbon dioxide, sulphur dioxide and nitrogen dioxide which are released from vehicles and chimneys mix with droplets of rain and turn the rain water
4=Causes of the allergic reaction
5=Sulphuric acid
Sulphuric acid is produced from sulfur. In the presence of air, sulfur dioxide is first obtained by burning the molten sulfur. In the presence of a catalyst for vanadium pentoxide, sulfur dioxide is then converted to sulfur tribut
SHORT-ANSWER QUESTIONS : Answer in 10-15 words
1=Bitter taste (opposed to sour taste of acids)
Slimy, or soapy feel on fingers (Slippery)
2=Methyl Orange & Phenolphthalein
3=In the context of a chemical reaction the term neutralization is used for a reaction between an acid and a base or alkali. Historically, this reaction was represented as acid + base (alkali) → salt + water. For example: HCl + NaOH → NaCl + H2O
4=Antacids are medication that neutralize stomach acid to cut down on heartburn, sour stomach, acid indigestion, and stomach upset. Some antacids also contain simethicone, an ingredient that helps your body get rid of gas
5=If your soil is alkaline, you can lower your soil's pH or make it more acidic by using several products. These include sphagnum peat, elemental sulfur, aluminum sulfate, iron sulfate, acidifying nitrogen, and organic mulches LONG-ANSWER TYPE QUESTIONS : Answer in 20-25 words
1a=Blue Litmus will change into red if it is added in sodium hydroxide. Hope you find this useful. Answer: When sodium hydroxide or caustic soda is poured on the blue litmus paper, the litmus paper remains unchanged
1b=when a drop of hydrochloric acid is added to China rose indicator it will change into dark pink or magenta colour which shows that the solution is acidic.
1c=when a drop of dilute sulphuric acid is added to red cabbage juice it turns into pink colour which shows that the solution is acidic
2=In a neutralization reaction, equivalent amounts of acid and base combine to form equivalent amounts of salt and water. An equivalent is the reactive capacity of a chemical species. In acids, the equivalent unit is the number of hydrogen ions (H+) provided for a reaction.
2a=The substance (or substances) initially involved in a chemical reaction are called reactants or reagents. Chemical reactions are usually characterized by a chemical change, and they yield one or more products, which usually have properties different from the reactants.
2b=Products are the species formed from chemical reactions. During a chemical reaction reactants are transformed into products after passing through a high energy transition state.
3=Nature of the solution of washing soda is basic. its molecular formula is na2co3. it can be confirmed by using red litmus paper, it will turn red to blue
4=Difference Between Acid and Base - Acid is a kind of chemical compound that when ... Acid and base are the form of chemicals which plays a vital role in chemistry ... 2. Weak Acids- A weak acid partly dissociates ions in water. The rest of the ... You can identify base with the help of these given ways like they are slippery to ...
5=Ammonium hydroxide is used as a cleaning agent and sanitizer in many household and industrial cleaners. Ammonium hydroxide is also used in the manufacture of products such as fertilizer, plastic, rayon and rubber. Aqueous ammonia is corrosive to aluminum alloys, copper, copper alloys, and galvanized surfaces.
5b=Hydrochloric acid is also used in the production of batteries, photoflash bulbs and fireworks. It's even used to process sugar and make gelatin. Hydrochloric acid, like last month's chlorine compound, sodium chloride, is another "workhorse" chemical because it is incredibly useful in a wide variety of ways.
5c=Magnesium hydroxide reduces stomach acid, and increases water in the intestines which may induce bowel movements. Magnesium hydroxide is used as a laxative to relieve occasional constipation. Magnesium hydroxide is also used as an antacid to relieve indigestion, sour stomach, and heartburn