In order to determine acidic, basic or neutral character of solutions, a student tabulated the following results after experimentation. Which of the following observations has been tabulated correctly? Case Test Solution Colour change on red litmus paper Colour change on blue litmus paper Acidic/Basic/Neutral A NaCl No change Red Acidic B Lime water Blue No change Neutral C Vinegar No change No change Neutral D Washing soda Blue No change Basic

In order to determine acidic, basic or neutral character of solutions, a student tabulated the following results after experimentation. Which of the following observations has been tabulated correctly? Case Test Solution Colour change on red litmus paper Colour change on blue litmus paper Acidic/Basic/Neutral A NaOH No change Red Acidic B Sour Milk Blue No change Neutral C Vinegar No change No change Neutral D Washing soda Blue No change Basic

A

B

C

D

Student A rub solid baking soda on dry litmus paper, B rub metal oxide on dry litmus paper, C dip litmus paper in vinegar, D dip litmus paper in aqueous solution of baking soda. The observations were made by student A, B, C, and D should be- Student Effect on dry red litmus paper Effect on dry blue litmus paper A Color Changed to blue No change B No change Color changed to red C No change Color changed to red D Color Changed to blue Color changed to red The correct observation was made by the student

A

B

C

D

The following observations were made by student A, B, C, and D when they rubbed solid baking soda on dry litmus paper : Student Effect on dry red litmus paper Effect on dry blue litmus paper A Color Changed to blue No change B No change Color changed to red C Color changed to blue Color changed to red D No change No change The correct observation was made by the student

A

B

C

D

Six friends B1, B2, B3, B4, B5 and B6 are playing a game. Each of them likes one colour among red, yellow, black, white, green and blue. Each of them like one tie among T1, T2, T3, T4, T5 and T6. None of them likes the same colour and None of them likes same tie. One who likes T3 also likes yellow colour. One who likes T5 also likes red colour. B1 don’t like red colour. B6 likes T2 tie and black colour. B2 likes either white colour or green colour. B4 likes T1 tie. One who likes green colour also likes T4 tie. Either B1 or B5 likes T4 tie. B5 like either yellow colour or red colour. If B3 likes T3 tie, then which of the following combination of Tie – Colour – Friend is not correct?

A

T1 – Blue – B4

B

T2 – Red – B6

C

T4 – Green – B1

D

T6 – White – B2

Identify the incorrect statement. a. Acids are sour in taste whereas bases are bitter in taste and soapy to touch. b. Acids turn blue litmus red and bases turn red litmus blue. c. Solutions of substances tat show different colours in acidic, basic and neutral solutions are called indicators. d. An acid and a base neutralise each other to form a salt and a salt is always neutral.

A

a, d

B

c

C

b, c

D

d

An acid turns blue litmus red and base turns red litmus blue. A group of student in a laboratory tested a solution with a red litmus paper which remained red with no change. This result shows that the solution is

A

Not a base

B

Not a acid

C

Neither acid nor a base

D

Both acid and base

A litmus paper test is conducted for solutions I, II, and III respectively with the following results: I. Litmus turned red II.Litmus turned blue III Litmus didn't change colour What conclusions can be drawn from this?

A

Solution I is acidic, II is alkali and III is neutral

B

Solution I is acidic, II is neutral and II is alkali

C

Solution I is neutral, II is alkali and II is acidic

D

Solution I is neutral, II is acidic and II is alkali

Which of the following two statements is correct? a. The soda commonly used in the kitchen for making tasty crispy pokodas is baking soda. The baking soda is a sodium carbonate. b. Washing soda is usually used as a cleaning agent for domestic purposes and in glass, soap, paper industries. The washing soda is sodium hydrogen carbonate.

A

Only a

B

Only b

C

Both a and b

D

Neither a nor b

A, B, C, D, E and F are six girls who use 6 different face wash – Pond’s, Lakme, Lotus, Garnier, Himalaya and Kaya (but not necessarily in the same order). They also like six different colours – Red, Blue, Brown, Peach, Black and White (also not necessarily in the same order. A and C do not like a Red colour. The girl who uses Lakme face wash likes Peach colour. The girl who likes White colour does not use Kaya nor Lotus face wash. B neither likes Peach nor Red colour. D does not like a Blue colour but uses a Lotus face wash. The girl who uses Pond’s face wash likes Red colour. C does not use Lakme face wash nor likes white colour. F neither uses Himalaya nor Kaya face wash but likes Brown colour. Who does use Himalaya’s face wash?

A

B

C

D

E

Acid turns blue litmus red and base turns red litmus blue. A student tested a liquid with a red litmus paper which remained red with no change. This shows that the liquid

A

is not a base

B

is not an acid

C

is neither an acid nor a base

D

must be pure water or acid

Case	Test Solution	Colour change on red litmus paper	Colour change on blue litmus paper	Acidic/Basic/Neutral
A	NaCl	No change	Red	Acidic	Inorrect
B	Lime water	Blue	No change	Neutral	Inorrect
C	Vinegar	No change	No change	Neutral	Inorrect
D	Washing soda	Blue	No change	Basic	Correct

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