Std: 6 CHAPTER 3 SCIENCE SEM 1

ACID, BASE AND SALT PURVESH SIR (Ph): 9429976149

Q 1 Blanks/MCQ:1). The substance which change the colour of blue litmus paper into red are called .................................................................................2). Some solution of substances which do not make any effect on either red litmus or blue litmus paper are called .......................................................................................................... substance.3). Acids turn ................................................................ litmus paper into .......................................................4). Bases turn ............................................................... litmus paper into .......................................................5). The substance which change the colour of the red litmus paper into blue are called .................................................................................6). Acids are ........................................................................ in taste.7). Bases are ....................................................................... in taste.8). Give two example of Acid substance: ________________________________________________________________9). Give two example of Bases substance: _______________________________________________________________10). Give two example of Neutral Substance: __________________________________________________________11). Give two examples of Salts: _________________________________________________________________________12). Give two examples of natural Indicators: __________________________________________________________13). Which indicator is used in laboratory for Titration in Acid Base Reaction? ______________________________________________________________________________________________________________14). Solution of acid.......................................................................................................................(A) Solution of common salt (B) Solution of Sugar (C) Solution of lemon (D) Solution of baking soda15). Solution of salt .........................................................................................................................(A) Solution of lemon (B) Solution of tomato (C) Solution of washing soda (D) Solution of Sugar16). Solution of base............................................................................................................................(A) Solution of soap (B) Solution of tomato (C) Solution of Sugar (D) Solution of common salt17). Neutral solution............................................................................................................................(A) Solution of Sugar (B) Solution of tomato (C) Solution of soap (D) Solution of tamarind18). Which salt is used in fire extinguisher equipment? _______________________________________________19). Which salt is used in washing clothes and utensils? ______________________________________________20). Which salt is used in preparation of washing soda? ______________________________________________21). Which salt is used to convert hard water into soft water? _______________________________________22). Which salt is used to preserve food for long duration? ___________________________________________23). Which substance is useful in the medicine of acidity? ____________________________________________24). Which main salt is in the sea water? _______________________________________________________________25). Which flower can be used to prepare indicator? __________________________________________________26). Glucose is a ......................................................................................... solution. [acidic, basic, neutral, salt]27). ................................................................................. are sour in taste. [Acids, Bases, Salts]28). Solution of sugar is .................................................................................... [acidic, basic, neural, salt]29). Cold drinks, fluid used in car batteries possesses ................................................................. properties. 30). The solution which turns blue litmus paper into red are ................................................ [acid, base]31). The solution which turns red litmus paper into blue are ................................................ [acid, base]32). Sodium hydroxide is a/an ................................................................................................ [acid, base, salt] 33). What is the chemical reaction takes place between acid and base called? .............................................................................................34). What is formed when acid and base react together? ..................................................................................35). Tamarind Solution is a/an ................................................................................................... [acid, base, salt]36). Phenolphthalein remains colorless in ..................................................................... and turns pink in .......................................................................................37). The substance which do not change the colour of either red or blue litmus are known as ........................................................................................ substances.38). Red litmus paper dipped in Lemon juice. ..........................................................................(A) Red litmus paper turns into blue. (B) Red litmus paper turns into pink.(C) No change in the colour. (D) Red litmus paper turns into brown39). Which of the following is acidic in nature? ............................................................................(A) Lime (B) Soap (C) Curd (D) Caustic Soda40). Solution of Common salt is a ........................................................................................... substance.41). Formula of sodium chloride is ...................................................................(A) NaOH (B) NaCl (C) HCl (D) H2O42). Formula of sodium hydroxide is .......................................................................(A) NaOH (B) NaCl (C) HCl (D) H2O43). Formula of hydrochloric acid is .........................................................................(A) NaOH (B) NaCl (C) HCl (D) H2O44). Solution of sugar is a ........................................................................ substance.45). Which main salt is in sea water? .......................................................................46). Acid + Base = _____________________________ + ________________________________

Q 2 True or False:1). Baking Soda is used to make medicine for acidity. _____________________________2). All neutral substances are salts. _______________________________________________3). Washing soda is used to convert hard water into soft water. _____________________________4). Washing soda is used in fire extinguishing equipment. _______________________________5). Common Salt is used in preparation of washing soda. _________________________________6). Tamarind Solution is acidic in nature. ______________________________________________

Q 3 Define:1). Acid: ____________________________________________________________________________________________________ ____________________________________________________________________________________________________________________________________________________________________________________________________________________________2). Base: _______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________3). Neutral substance: _______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________4). Neutralisation: _________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Q 4 State the properties of acid and give its three examples__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Q 5 State three properties of base and give its three examples.__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Q 6 State the uses of acid.________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Q 7 State the uses of base.________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Q 8 State the uses of salt.________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Q 9 Explain All neutral substances are not salt__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Q 9 Difference between:AcidBase

AcidSalt

BaseSalt