Class 7 Science MCQ Test-1

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| By Abhik Kundu

Abhik Kundu

Community Contributor

Quizzes Created: 1 | Total Attempts: 406

Questions: 5 | Attempts: 407 | Updated: Nov 8, 2024

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This Class 7 Science MCQ Test-1 assesses knowledge in Chemistry, focusing on reactions, acids, bases, and indicators. It is designed to enhance understanding of basic chemical concepts and their applications, perfect for young learners.

Questions and Answers

1.

Which of the following type of medicine is used for treating indigestion caused by overeating?
- A.
  
  Antibiotic
- B.
  
  Analgesic
- C.
  
  Antacid
- D.
  
  Antiseptic
Correct Answer
C. Antacid

Explanation
Antacids are used for treating indigestion caused by overeating. They work by neutralizing excess stomach acid and providing relief from symptoms such as heartburn, bloating, and discomfort. Antibiotics are used to treat bacterial infections, analgesics are used for pain relief, and antiseptics are used to prevent infection in wounds. However, none of these medications specifically target indigestion caused by overeating like antacids do.

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2
2.

The two indicators which give red or pink colour on adding a basic solution are: A. Chaina rose indicator B. Turmeric paper indicator C. Phenolphthalein Indicator D. Blue litmus indicator
- A.
  
  A & B
- B.
  
  B & C
- C.
  
  C & D
- D.
  
  D & A
Correct Answer
B. B & C

Explanation
The correct answer is B & C. Turmeric paper indicator and Phenolphthalein indicator both give a red or pink color on adding a basic solution. Turmeric paper turns red in the presence of bases, while Phenolphthalein indicator turns pink in basic solutions.

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3.

Which of the following is a mineral acid?
- A.
  
  Citric acid
- B.
  
  Acetic acid
- C.
  
  Carbonic acid
- D.
  
  Oxalic acid
Correct Answer
C. Carbonic acid

Explanation
Carbonic acid is a mineral acid because it is derived from minerals, specifically carbonates. It is formed when carbon dioxide dissolves in water, resulting in the formation of carbonic acid. Mineral acids are typically strong acids that can donate protons easily, and carbonic acid fits this definition. On the other hand, citric acid, acetic acid, and oxalic acid are organic acids that are derived from living organisms and do not fall under the category of mineral acids.

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2
4.

Which one of the following salts will give a basic solution on dissolving in water?
- A.
  
  Sodium Carbonate
- B.
  
  Sodium Chloride
- C.
  
  Sodium sulphate
- D.
  
  Ammonium Chloride
Correct Answer
A. Sodium Carbonate

Explanation
Sodium Carbonate will give a basic solution on dissolving in water because it is a salt of a strong base (sodium hydroxide) and a weak acid (carbonic acid). When sodium carbonate dissolves in water, it dissociates into sodium ions and carbonate ions. The carbonate ions can accept protons from water molecules, resulting in the formation of hydroxide ions, which are responsible for the basic nature of the solution.

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5.

Which one of the following is a strong base?
- A.
  
  Calcium hydroxide
- B.
  
  Sodium hydroxide
- C.
  
  Sodium carbonate
- D.
  
  Ammonium Hydroxide
Correct Answer
B. Sodium hydroxide

Explanation
Sodium hydroxide is a strong base because it completely dissociates in water to produce hydroxide ions (OH-) and sodium ions (Na+). This dissociation is almost 100% and results in a high concentration of hydroxide ions in solution, making it a strong base. Calcium hydroxide is also a base, but it is considered a weak base because it only partially dissociates in water. Sodium carbonate is a salt and Ammonium hydroxide is a weak base.

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Current Version
Nov 08, 2024

Quiz Edited by
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Jul 06, 2020

Quiz Created by
Abhik Kundu

Class 7 Science MCQ Test-1

Which of the following type of medicine is used for treating indigestion caused by overeating?

The two indicators which give red or pink colour on adding a basic solution are: A. Chaina rose indicator B. Turmeric paper indicator C. Phenolphthalein Indicator D. Blue litmus indicator

Which of the following is a mineral acid?

Which one of the following salts will give a basic solution on dissolving in water?

Which one of the following is a strong base?