Question Answers
Sahay Sir > Question Answers
A quadratic polynomial, whose zeroes are -3 and 4, is
22
Nov
A quadratic polynomial, whose zeroes are -3 and 4, is A quadratic polynomial is whose zeroes are -3 and 4 November 22, 2020 Category: Chapter 2 - Polynomials , Maths , NCERT Class 10 ,
A 1.025 g sample containing a weak acid HX (mol. Mass=82) is dissolved in 60 mL. water and titrated with 0.25 M NaOH. When half of the acid was neutralised the pH was found to be 5.0 and at the equivalence point the pH is 9.0. Calculate mass percentage of HX in sample :
22
Nov
A 1.025 g sample containing a weak acid HX (mol. Mass=82) is dissolved in 60 mL. water and titrated with 0.25 M NaOH. When half of the acid was neutralised the pH was found to be 5.0 and at the equivalence point the pH is 9.0. Calculate mass percentage of HX in sample : 1.0 [...]
How many gm of solid KOH must be added to 100 mL of a buffer solution to make the pH of solution 6.0, if it is 0.1 M each w.r.t. acid HA and salt K A. [Given : pKa (HA)=5]
22
Nov
How many gm of solid KOH must be added to 100 mL of a buffer solution to make the pH of solution 6.0, if it is 0.1 M each w.r.t. acid HA and salt K A. [Given : pKa (HA)=5] How many gm of solid KOH must be added to 100 mL of a buffer [...]
How many gm of solid KOH must be added to 100 mL of a buffer solution to make the pH of solution 6.0, if it is 0.1 M each w.r.t. acid HA and salt K A. [Given : pKa (HA)=5]
22
Nov
How many gm of solid KOH must be added to 100 mL of a buffer solution to make the pH of solution 6.0, if it is 0.1 M each w.r.t. acid HA and salt K A. [Given : pKa (HA)=5] How many gm of solid KOH must be added to 100 mL of a buffer [...]
Fe(OH)2 is diacidic base has Kb1=10^−4 and Kb2 = 2.5 × 10^−6 What is the concentration of Fe(OH)2 in 0.1 M Fe(NO3)2 solution?
22
Nov
Fe(OH)2 is diacidic base has Kb1=10^−4 and Kb2 = 2.5 × 10^−6 What is the concentration of Fe(OH)2 in 0.1 M Fe(NO3)2 solution? Fe(OH)2 is diacidic base has Kb1=10^−4 and Kb2 = 2.5 × 10^−6 What is the concentration of Fe(OH)2 in 0.1 M Fe(NO3)2 solution? November 22, 2020 Category: Chapter 6 - Ionic Equilibrium [...]
Ka for the reaction; Fe^3 + (aq.)+H2O(l) ⇌ Fe(OH)^2 + (aq.)+H3O^+ (aq.) is 6.5×10^−3 . What is the maximum pH value which could be used do that at least 80% of the total ion (III) in a dilute solution exists as Fe^3+ ?
22
Nov
Ka for the reaction; Fe^3 + (aq.)+H2O(l) ⇌ Fe(OH)^2 + (aq.)+H3O^+ (aq.) is 6.5×10^−3 . What is the maximum pH value which could be used do that at least 80% of the total ion (III) in a dilute solution exists as Fe^3+ ? 1.0 L solution is prepared by mixing 61 g benzoic acid (pKa=4.2) [...]
If one of the zeroes of the quadratic polynomial (k – 1)x^2 + kx +1 is −3 then the value of k is (a) 4/2 (b) −4/3 (c) 2/3 (d) −2/3
22
Nov
If one of the zeroes of the quadratic polynomial (k – 1)x^2 + kx +1 is −3 then the value of k is (a) 4/2 (b) −4/3 (c) 2/3 (d) −2/3 If one of the zeroes of the quadratic polynomial (k – 1)x^2 + kx +1 is −3 then the value of k is (a) [...]
Show that the square of an odd positive integer can be of the form 6q+1 or 6q+3 for some integer q .
22
Nov
Show that the square of an odd positive integer can be of the form 6q+1 or 6q+3 for some integer q . Show that the square of an odd positive integer can be of the form 6q+1 or 6q+3 for some integer q . November 22, 2020 Category: Chapter 1 - Real Numbers , Maths [...]
Prove that root 2 + root 3 is irrational.
22
Nov
Prove that root 2 + root 3 is irrational. Prove that root 2 + root 3 is irrational. November 22, 2020 Category: Chapter 1 - Real Numbers , Maths , NCERT Class 10 ,
The number of g – atom of oxygen in 6.02 x 10^24 CO molecule is (a) 1 (b) 0.5 (c) 5 (d) 10
22
Nov
The number of g – atom of oxygen in 6.02 x 10^24 CO molecule is (a) 1 (b) 0.5 (c) 5 (d) 10 The number of g - atom of oxygen in 6.02 x 10^24 CO molecule is (a) 1 (b) 0.5 (c) 5 (d) 10 November 22, 2020 Category: Uncategorised (JEE Advanced Physics by [...]