If the pH value of X is 9, then the pH value of Y is 2, the pH value of Z is 6 and the pH value of A is 13, then which of the following pairs has strong acid and strong base?

Which one is incorrect match:- TITRATION INDICATOR 1) Strong acid v/s strong base Phenolphthalein & methyl Orange 2) Weak acid v/s strong base Phenolphthalein 3) Strong acid v/s weak base Methyl orange 4) Weak acid v/s weak base Methyl Red

A

1

B

2

C

3

D

4

In a batch process, the reaction takes place in the presence of an acid medium. The acid is drained from the reaction vessel at the rate of 15ml/s as a result of the density difference of the acid from the reacting component. To avoid wastage of acid, it is recycled to an acid tank which has 1000 L capacity. The acid drained from the reaction vessel, picks up 50 g/L solids from the reactor. Acid is fed once again to the process from acid tank. When the process is started, the acid is almost pure in the tank as a result of filtration. As the reaction proceeds, acid in the tank gets more and more contaminated with the solids. The concentration of the solids should not exceed 100 g/L from the process point of view. The batch time is 16h. Estimate whether the concentration of the solids will exceed 100g/L during the batch reaction.

A

37.04 h

B

30.05 h

C

36.04 h

D

32.05 h

Which statement is correct about strong acid? Statement 1: An acid that is completely ionized in water and thus produces a very small amount of hydrogen ions is called a strong acid. Statement 2: Sulphuric acid and nitric acid are also strong acids.

A

Statement 1 is correct

B

Statement 2 is correct

C

Both statements are correct

D

None of the above

For transistor action (a) Base, emitter, and collector regions should have similar size and doping concentrations. (b) The base region must be very thin and lightly doped. (c) The emitter-base junction is forward biased and the base-collector junction is reverse biased. (d) Both the emitter-base junction as well as the base-collector junction are forward biased. Which one of the following pairs of statements is correct?

A

(d), (a)

B

(a), (b)

C

(b), (c)

D

(c), (d)

A laboratory teacher had 1.5 litres of concentrated sulfuric acid. She replaces concentrated sulfuric acid with water after every class till the carton is empty. One student needs 10 ml of sulfuric acid mixture in every class. First class had 20 students and since then all other classes observed 10 students. Calculate total quantity of water with which mixture of sulfuric acid and water is replaced till carton is empty. Note 1.5 litres of concentrated sulfuric acid had 90% sulfuric acid and rest water

A

7230 ml

B

11230 ml

C

10230 ml

D

9230 ml

E

8230 ml

Consider the following statements: (a) Both acids and bases change the colour of all indicators. (b) If an indicator gives a colour change with an acid, it does not give a change with a base. (c) If an indicator changes colour with a base, it does not change colour with an acid. (d) Change of colour in an acid and a base depends on the type of the indicator. Which of these statements are correct?

A

All four

B

a and d

C

b, c and d

D

only d

Which of the following statements are correct about an aqueous solution of an acid and a base? 1. Higher the pH, stronger is the acid. 2. Higher the pH, weaker is the acid. 3. Lower the pH, stronger is the base. 4. Lower the pH, weaker is the base.

A

1 and 3

B

2 and 3

C

1 and 4

D

2 and 4

Which of the following chemicals are used to treat the instruments made out of polymers? i) Ethylene Oxide ii) Hydrochloric Acid iii) Silver Cyanide iv) Ozone v) Bleach vi) Saline Solution vii) Sulphuric Acid viii) Glutaraldehyde and Formaldehyde ix) Phthalaldehyde x) Hydrogen Peroxide xi) Nitric Acid xii) Peracetic Acid xiii) Silver xiv) Formic Acid xv) Citric Acid

A

i, ii, iii, iv, v, vi

B

ii, iv, vi, viii, x, xii

C

i, iv, v, viii, ix, x, xii, xiii

D

iii, iv, ix, xii, xv

Which statement is correct about weak acid? Statement 1: An acid that is completely ionized in water and thus produces a very small amount of hydrogen ions is called a weak acid. Statement 2: Carbonic acid and sulfurous acid are also strong acids.

A

Statement 1 is correct

B

Statement 2 is correct

C

Both are correct

D

None is correct

interface Base{ boolean m1 (); byte m2(short s);}

which two code fragments will compile?

1. interface Base2 implements Base {}2. abstract class Class2 extends Base { public boolean m1(){ return true; }}3. abstract class Class2 implements Base {}4. abstract class Class2 implements Base { public boolean m1(){ return (7 > 4); }}5. abstract class Class2 implements Base { protected boolean m1(){ return (5 > 7) }}

A

1 and 2

B

2 and 3

C

3 and 4

D

1 and 3

E

4 and 5

If the pH value of X is 9, then the pH value of Y is 2, the pH value of Z is 6 and the pH value of A is 13, then which of the following pairs has strong acid and strong base?

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