Science Class 8th
421. Reaction between acid and alkalis is called:
A) Addition Reaction
B) Neutralization Reaction
C) Elimination Reaction
D) None of the above
422. Acids are corrosive and can burn skin and dissolve metal.
A) True
B) False
423. Acids react with _____ to give salt and H2 gas.
A) Non Metals
B) Semi Metals
C) Metals
D) None of the above
424. Acids turn blue litmus into ______.
A) Yellow
B) Black
C) Red
D) None of the above
425. Soft drinks contain which type of acid?
A) Citric
B) Acetic
C) Carbonic
D) Lactic
426. Which of the following is bitter in taste?
A) Salts
B) Acids
C) Alkalis
D) None of the above
427. Alkalis react with ______ to give salt and H2 gas.
A) Non Metals
B) Semi Metals
C) Metals
D) All of the above
428. Salts cannot be dissolved in water.
A) True
B) False
429. pH is the measure of concentration of H released in the solution.
A) True
B) False
430. pOH is the measure of concentration of OH ions.
A) True
B) False
431. Drains Openers are usually:
A) Basic
B) Alkali
C) Can be Both
D) None of the above
432. Acids can be used to remove rust.
A) True
B) False
433. _______ are used in baking soda preparation.
A) Alkali
B) Acids
C) Salts
D) Both A and B
434. Antacid is used for:
A) Neutralization of Sting of Ant
B) Neutralization of Stomach Acidity
C) Cleaning Tough Spots
D) Detoxifying
435. NaCl and other salts can be used for preservation.
A) True
B) False
436. Which of the following is used top check chemical nature?
A) Taste Test
B) Skin Corrosion test
C) Indicators
D) None of the above
437. What is the final colour of Methyl Orange in Acid:
A) Red
B) Blue
C) Pink
D) Colorless
438. When an acid combines with an alkali the product formed are:
A) Salts and H2O
B) Salts and C02
C) Salts and H2
D) Alkali and Salts
439. Vinegar is:
A) Acid
B) Alkali
C) Salt
D) None of the above
440. CO2 is produced when an acid reacts with:
A) Carbonates
B) Sulphates
C) Salts
D) Non Metals