Acid and Base

Given the reaction above, which compound is the conjugate base?

• NH₃

• NH₄⁺

• Cl^-

How do Bronsted-Lowry conjugate acid-base pairs differ?

• differ by one H⁺

• Differ by one OH^-

• Differ by two H⁺

• Differ by some number of H⁺

An Arrhenius base:

• donates H+

• accepts H+

• produces H+

• produces OH-

Which of the following show an acid and its conjugate base pair (in that order)

• H₂SO₄, SO₄^2-

• OH^-, H₂O

• NH₄⁺, H₂O

• H₂CO₃, HCO₃^-

The conjugate acid of HCO₃^- is ___ and the conjugate base of HCO₃^- is ___.

• H₂CO₃; CO₃^-2

• CO₃^-2; CO₃^-2

• H₂CO₃; H₂O

• H₂O; H₂CO₃

Will the colour of the red litmus paper will change to blue if it is dipped into a basic solution?

• Yes

• No

Tags

NGSS.MS-PS1-2

Consider the following statements :

(a)Both acids and bases change 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?

• All four

• a and d

• b , c and d

• Only d

Name the reaction :

The reaction between an acid and base produces salt and water with evolution of heat.

If a substance tastes sour it is known as

• Basic

• Acidic

• Neutral

• None of these

Curd contains (a)________, whereas lime water has (b)__________.

• a= Citric acid ; b= Sodium hydroxide

• a= Lactic acid ; b= Calcium hydroxide

• a= Calcium hydroxide ; b= Lactic acid

• None of these

Tags

NGSS.MS-PS1-1