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Test: Acids Bases and Salts (July 29) - NEET MCQ


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10 Questions MCQ Test - Test: Acids Bases and Salts (July 29)

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Test: Acids Bases and Salts (July 29) - Question 1

Direction (Q. Nos. 1-15) This section contains 15 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.

Q. Which of the following is least likely to behave as Lewis base?

Detailed Solution for Test: Acids Bases and Salts (July 29) - Question 1

Electron rich species are called lewis base. Among the given, BF3 is an electron deficient species, so have a capacity of electrons accepting instead of donating that's why it is least likely to act as a lewis base. It is a lewis acid. 

Test: Acids Bases and Salts (July 29) - Question 2

Which of the following is not acid-base conjugate pair?

Detailed Solution for Test: Acids Bases and Salts (July 29) - Question 2

Acid ⇋ Conjugate Base  +  H+
By this definition,
HNO2 ⇋ NO2- + H+
CH3NH3+ ⇋ CH3NH2 + H+
C6H5COOH ⇋ C6H5COO- + H+
H3O+ ⇋ H2O + H+
We can see that the conjugate base of H3O+ is H2O. But it is given that OH- is the C.B. So option d is incorrect.

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Test: Acids Bases and Salts (July 29) - Question 3

Which one of the following molecular hydrides acts as a Lewis acid?

Detailed Solution for Test: Acids Bases and Salts (July 29) - Question 3

B2H6 is an electron deficient species. Soit will act as Lewis acid.

Test: Acids Bases and Salts (July 29) - Question 4

In the following reaction,

Species behaving as Bronsted-Lowry acids are

Detailed Solution for Test: Acids Bases and Salts (July 29) - Question 4

Bronsted lowry acids are those acids which donate H+. In the reaction, A and D are giving H+. So, these both are bronsted lowry acid.

Test: Acids Bases and Salts (July 29) - Question 5

Which of the following will produce a buffer solution when mixed in equal volumes ?

Detailed Solution for Test: Acids Bases and Salts (July 29) - Question 5

For a buffer, we need to have a weak base/acid and its salt. Here, we have a weak base and so we will need its salt. In option c, concentration of strong acid is less than base. So we will have both a weak base and its salt. Therefore, only option c gives us a buffer solution.

Test: Acids Bases and Salts (July 29) - Question 6

PH can be kept constant with help of

Detailed Solution for Test: Acids Bases and Salts (July 29) - Question 6

A buffer is an aqueous solution containing a weak acid and its conjugate base or a weak base and its conjugate acid. It is used to prevent any change in the pH of a solution, regardless of solute. Buffer solutions are used as a means of keeping pH at a nearly constant value in a wide variety of chemical applications.

Test: Acids Bases and Salts (July 29) - Question 7

Acidic strength is in order

Detailed Solution for Test: Acids Bases and Salts (July 29) - Question 7

When we move from left to right, electronegativity of central atom increases. Due to this nature, central atom has more tendency to break its bond with H and acquire negative charge. So, while moving from left to right, acidic strength increase.

*Answer can only contain numeric values
Test: Acids Bases and Salts (July 29) - Question 8

What will be the value of pH of 0.01 mol dm–3 CH3COOH (Ka = 1.74 × 10–5)?


Detailed Solution for Test: Acids Bases and Salts (July 29) - Question 8

*Answer can only contain numeric values
Test: Acids Bases and Salts (July 29) - Question 9

How many of the following are Lewis bases?


Detailed Solution for Test: Acids Bases and Salts (July 29) - Question 9

Total number of compounds acting as Lewis base in the given example is 6. H+ and BF3 are electron deficient so they can't act as Lewis base while FeCl3 acts as Lewis acid so all the other compounds except these three are Lewis base.

*Answer can only contain numeric values
Test: Acids Bases and Salts (July 29) - Question 10

For A- + H2O ⇔ HA + OH-, Kb = 1 x 10-12

Thus, pKa of HA + H2O ⇔ H3O + A- is ........


Detailed Solution for Test: Acids Bases and Salts (July 29) - Question 10

The correct answer is 2
Here
we know [OH-][H+]=10-14 at 25 degree Celsius
so pka+pkb=14
hence answer is 2

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