S-block elements assignment

Updated: Jan 16

Download PDF⏬

https://drive.google.com/file/d/11ORKBX7fM56rislK6u92XIL9sewrSMDZ/view?usp=drivesdk


Unit test 1

• 1. What is the pH 10–3 M HCl solution ?[1]

• (a) 1 (b) 11 (c) 3 (d) 14

• 2. Which one can act as Arrhenius Acid ? [1]

• (a) NH3 (b) H2O (c) HCl (d) C6H5OH

• 3. Write the conjugate base of CH3COOH, H2O. [1]

• 4. Write the relation between Kp and Kc

• . [1]

• 5. What is the nature of following reaction [1]

• Exothermic or endothermic

• A + B – 70J —→ C

• 6. The pka of CH3COOH and pkb of NH4OH are 4.76 and 4.75

respectively.

• Calculate the pH of CH3COONH4. [2]

• 7. What is a buffer solution. Calculate the pH of the solution obtained

by

• adding 4mol of CH3COOH with 3 mol of NaOH in 1 litre container.[2]

• pka, CH3COOH = 4.74 log2 = 0.3010 log3 = 0.4771

• 8. Calculate the molar solubility of Ni(OH)2 in 0.1M KOH solution. The

Ksp

• for Ni(OH)2 is 2.0×10–15. [3]

• 9. K

• p = 0.04 atm at 899 K for the equilibrium shown below. What is the

• equilibrium concentration of H2 when it is placed in a flask at 4.0 atm

• pressure and allowed to come to equilibrium. [3]

6 views0 comments

Recent Posts

See All

Important points : 1) S-block consists of group-1 (alkali metals) and group 2(alkaline earth metals) 2) GROUP-1 _ Elements-I (LiNa Ki Ruby Cse Friendship hai) _Name -Alkali because hydroxide