Increase
Decrease
Increase to 7 and then decrease
Decrease to 7 and then increase
- An acid is a substance that has a pH lower than 7. For example, hydrochloric acid, sulphuric acid, citric acid, ethanoic acid (vinegar).
- A base is a substance that neutralises an acid – those that dissolve in water are called alkalis.
- An alkali is a soluble substance with a pH higher than 7. For example, sodium hydroxide (used to make soap), potassium hydroxide, oven cleaner, toothpaste, shampoo.
- As alkali is added to an acidic solution, the pH of the solution will increase.
- When an alkali is added to an acid, a chemical reaction occurs, resulting in the formation of a new substance. If you combine the correct amounts of acid and alkali, you will get a neutral solution. Antacids, for example, contain alkalis, which help to increase the pH and restore the proper balance.
The pH Scale: The pH of a solution depends on the strength of the acid: strong acids have lower pH values (pH 1-3) than weak acids. Neutral solutions have a pH of 7. For example, pure water.
Also check:
- Which one of the following is an alkali? (CSS 2011 General Science & Ability Paper)
- All Alkali metals react with water to form? (CSS 2014 General Science & Ability Paper)
- H+ is yielded by?(CSS 2019 General Science & Ability Paper)
If you are interested in preparing for the CSS MPT and other FPSC, SPSC, and PPSC General Recruitment Tests with us, get in touch with us.
Related MCQs
- Coulomb is the scientific unit to measure? (CSS 2013 General Science & Ability Paper)
- Mass
- Velocity
- Temperature
- Electric charge
Submitted by: CSS Exam Desk Team
- First National Science & Technology Park Of Pakistan Was Inaugurated By Imran Khan On? (CSS 2020 Current Affairs Paper)
- Dec 10, 2019
- Dec 9, 2019
- Jan 4, 2020
- None of these
Submitted by: CSS Exam Desk Team
- Evolution can be described as? (CSS 2010 General Science & Ability Paper)
- A continuing process
- A static and not evolving
- A catastrophic event in the past
- The attaining of an ideal type
Submitted by: CSS Exam Desk Team
- By whom the formula of 3rd June 1947 to divide India was announced? (CSS 2012 Pakistan Affairs Paper)
- Lord Atllee
- Lord Wovell
- Lord Mount Batten
- None of these
Submitted by: CSS Exam Desk Team
- slope low lying area of ocean near highland İs? (CSS 2015 General Science & Ability Paper)
- Costal Plane
- Ocean belt
- Desert plane
- All of these
Submitted by: CSS Exam Desk Team
- Optical fiber operates on the principle of? (CSS 2014 General Science & Ability Paper)
- Tyndall effect
- Photoelectric effect
- Laser technology
- Total internal reflection
Submitted by: CSS Exam Desk Team
- In September 2019, Abqiaq Khuaris Were Attacked? (CSS 2020 Current Affairs Paper)
- Yeman
- Syria
- Saudi Arabia
- None of these
Submitted by: CSS Exam Desk Team
- The astronomical unit of light-year is used for? (CSS 2018 General Science & Ability Paper)
- Distance
- Time Period
- Light Intensity
- Time
Submitted by: CSS Exam Desk Team
- A verse of the Holy Quran indicates the name of? (CSS 2009 Islamic Studies Paper)
- Hazarat Muaaz (RA)
- Hazrat Bilal (RA)
- Hazrat Zaid (RA)
- None of these
Submitted by: CSS Exam Desk Team
- Pakistan’s Supreme command of armed forces Is vested in whom? (CSS 2023 Pakistan Affairs Paper)
- President
- Prime Minister
- Army Chief
- None of these
Submitted by: CSS Exam Desk Team
- Who gave this statement, “There should not be contradiction between the words of God and works of God”? (CSS 2023 Special Pakistan Affairs Paper)
- Allama Muhammad Iqbal
- Sir Sayyid Ahmad Khan
- Inayatullah Khan Mashriqi
- None of these options
Submitted by: CSS Exam Desk Team
- The SYNONYM of the word \"MALEFIC\" is? (CSS 2013 English Precis & Composition Paper)
- Social
- Baleful
- Congenial
- Of a male person
Submitted by: CSS Exam Desk Team
- n 1867, some prominent Hindus of Banares Launched a movement for the replacement of Urdu written in Nasta’leeq by Hindi written in Deva Nagiri script as the Court language. In which province(s) was this movement started? (CSS 2011 Pakistan Affairs Paper)
- Bengal Province
- Central Provinces
- North-western Provinces
- None of these
Submitted by: CSS Exam Desk Team
- The Partition of Bengal was annulled in the year? (CSS 2018 Pakistan Affairs Paper)
- 1905
- 1911
- 1913
- 1914
Submitted by: CSS Exam Desk Team
- Who was the Prime Minister of India at the time of Tashkent Declaration? (CSS 2014 Pakistan Affairs Paper)
- Lal Bahadur Shastari
- Gulzarilal Nanda
- Charan Singh
- None of these
Submitted by: CSS Exam Desk Team
- Which of the following is a form of sexual reproduction? (CSS 2010 General Science & Ability Paper)
- Fission
- Budding
- Fragmentation
- Hermaphroditism
Submitted by: CSS Exam Desk Team
- It is a secondary plant nutrient? (CSS 2013 General Science & Ability Paper)
- Nitrogen
- Phosphorus
- Sulphur
- None of these
Submitted by: CSS Exam Desk Team
- On which tribe Zakat is prohibited? (CSS 2014 Islamic Studies Paper)
- Banu Hashim
- Banu ummayy
- Banu Quraish
- None of these
Submitted by: CSS Exam Desk Team
- Slatul Istasqa is the prayer for? (CSS 2015 Islamic Studies Paper)
- Salat ul Hajat
- The Prayer for Seeking Rain
- Prayer performed during a lunar eclipse
- None of these
Submitted by: CSS Exam Desk Team
- Who was elected as the Prime Minister of Pakistan after the 2002 general elections? (PPSC Tehsildar General Knowledge Test, December 15, 2024)
- Chaudhry Shujaat Hussain
- Mian Muhammad Azhar
- Mir Zafarullah Jamali
- Chaudhry Parvez Elahi
Submitted by: CSS Exam Desk Team
- Permanent hardness of water is due to the presence of? (CSS 2014 General Science & Ability Paper)
- Calcium bicarbonate
- Magnesium bicarbonate
- Calcium sulphate
- Sodium bicarbonate
Submitted by: CSS Exam Desk Team
- Who is the current president of UN General Assembly? (CSS 2022 Current Affairs Paper)
- Volkan Bozkir (Turkey)
- Csaba Kőrösi (Hungary)
- Abdulla Shahid (Maldives)
- Philemon Yang (Cameroon)
Submitted by: CSS Exam Desk Team
- The Iran-Pakistan gas pipeline is also known As? (CSS 2019 Current Affairs Paper)
- Friendship pipeline
- Peace pipeline
- Natural pipeline
- None of these
Submitted by: CSS Exam Desk Team
- Ghazwa ______ is named as Youm-ul-Furqan? (CSS 2016 Islamic Studies Paper)
- Badr
- Tabuk
- Uhad
- None of these
Submitted by: CSS Exam Desk Team
- The first Khilafat Conference was held in? (CSS 2020 Pakistan Affairs Paper)
- November 1918
- November 1919
- November 1920
- November 1921
Submitted by: CSS Exam Desk Team