# Conjugate acid of NH2– is: 1. NH4OH 2. NH4+ 3. $$NH_{2}^{-}$$ 4. NH3

Subtopic:  Acids & Bases - Definitions & Classification |
89%
From NCERT
AIPMT - 2000
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Incorrect statement about pH and H+ is:

 1 pH of neutral water is not zero. 2 Adding 1M solution of CH3COOH and 1M solution of NaOH, the pH will be 7. 3 H+ of dilute and hot H2SO4 is more than concentrate and cold H2SO4 4 Mixing solution of CH3COOH and HCl, pH will be less than 7

Subtopic:  pH calculation |
73%
From NCERT
AIPMT - 2000
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

At 25 ºC, the dissociation constant of a base, BOH, is 1.0 × 10–12. The concentration of hydroxyl ions in 0.01M aqueous solution of the base would be:

 1 1.0 × 10–6 mole L–1 2 1.0 × 10–7 mole L–1 3 2.0 × 10–6 mole L–1 4 1.0 × 10–5 mole L–1
Subtopic:  Ionisation Constant of Acid, Base & Salt |
74%
From NCERT
AIPMT - 2005
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

$\mathrm{If A}$ $+$ $B$ $⇋$ $C$ $+$ $D$ $Cons\mathrm{tan}t$ $=$ ${K}_{1}$
$E$ $+$ $F$ $⇌$ $G$ $+$ $H$ $Cons\mathrm{tan}t$ $=$ ${K}_{2}$

then C + D + E + F ⇒ product. The constant of reaction will be:

1.  $\frac{{K}_{1}}{{K}_{2}}$

2.  $\frac{{K}_{2}}{K1}$

3. ${K}_{1}{K}_{2}$

4. None of these

Subtopic:  Kp, Kc & Factors Affecting them |
77%
From NCERT
AIPMT - 1998
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The fertilizer which makes the soil acidic is:

1. ${\left(N{H}_{4}\right)}_{2}S{O}_{4}$

2.  Super phosphate of lime .

3. $C{H}_{3}COONa$

4. $Ca{\left(N{O}_{3}\right)}_{2}$

Subtopic:  Salt Hydrolysis & Titration |
73%
From NCERT
AIPMT - 1998
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

What is the correct relationship between the pHs of isomolar solutions of sodium oxide (pH1), sodium sulphide (pH2), sodium selenide (pH3), and sodium telluride (pH4)?

1. ${\mathrm{pH}}_{1}<{\mathrm{pH}}_{2}<{\mathrm{pH}}_{3}<{\mathrm{pH}}_{4}$

2. ${\mathrm{pH}}_{1}>{\mathrm{pH}}_{2}>{\mathrm{pH}}_{3}>{\mathrm{pH}}_{4}$

3. ${\mathrm{pH}}_{1}<{\mathrm{pH}}_{2}<{\mathrm{pH}}_{3}\approx {\mathrm{pH}}_{4}$

4. ${\mathrm{pH}}_{1}>{\mathrm{pH}}_{2}\approx {\mathrm{pH}}_{3}>{\mathrm{pH}}_{4}$

Subtopic:  pH calculation |
58%
AIPMT - 2005
Hints

H2S gas when passed through a solution of cations containing HCl precipitates the cations of second group of qualitative analysis but not those belonging to the fourth group. It is because:

 1 Presence of HCl decreases the sulphide ion concentration 2 Sulphides of group IV cations are unstable in HCl 3 Solubility product of group II sulphides is more than that of group IV sulphides 4 Presence of HCl increases the sulphides ion concentration
Subtopic:  Common Ion Effect |
AIPMT - 2005
Hints

Among the following examples, the species that behave(s) as a Lewis acid is/are:
$B{F}_{3},SnC{l}_{2},SnC{l}_{4}$
1. Stannous chloride, stannic chloride
2. $B{F}_{3}$stannous chloride
3. Only $B{F}_{3}$
4. $B{F}_{3}$, stannous chloride , stannic chloride

Subtopic:  Acids & Bases - Definitions & Classification |
From NCERT
AIPMT - 1999
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

4 gm of NaOH is dissolved in 1000 ml of water. The ${\mathrm{H}}^{+}$ ion concentration will be:

 1 10-1 M 2 10-13 M 3 10-4 M 4 10-10 M
Subtopic:  pH calculation |
70%
From NCERT
AIPMT - 1999
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The solubility product of a sparingly soluble salt AX2 is 3.2 ×10–11. Its solubility (in moles/litre) is:

1. 3.1×10–4

2. 2 × 10–4

3. 4 × 10–4

4. 5.6 × 10–6

Subtopic:  Solubility Product |
85%
From NCERT
AIPMT - 2004
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch