up board annual exam paper 2022 class 11th English paper full solutions

11th class English model paper solution

Model test paper class 9

NEET 2021 physics paper solution

In a hostel 60% of the students read Hindi news paper, 40% read English newspaper and 20% read both Hindi and English newspapers. A student is selected at random.Find the probability that she reads neither Hindi nor English news paper ?

An acid turns blue litmus paper or solution ________

Special type of filter papers are used for the filtration of colloidal solutions. Give reasons.

Identify (A),(B),(C ),(D) and (E ), (A) (black) + dil HCI overset(Delta) to (B) (solution) + (C ) (gas) ( C) turns lead aceetain paper black , (B) gives orange ppt (D ) solution in excess of KI forming (E ).

In a hostel 60% of the students read Hindi news paper, 40% read English news paper and 20% read both Hindi and English news papers. A student is selected at random. (a) Find the probability that she reads neither Hindi nor English news papers. (b) If she reads Hindi news paper, find the probability that she reads English news paper. (c) If she reads English news paper, find the probability that she reads Hindi news paper.

A solution 'X' give orange colour when a drop of it falls on pH paper, while another solution 'Y' gives bluish colour when a drop of it falls on pH paper. What is the nature of both the solutoins? Determine the pH of solution 'X' and 'Y'?

Give reason for the following within two sentences: i. Hydrogen bromide cannot be prepared by the action of concentrated sulphuric acid on sodium bromide. ii. When a blue litmus paper is dipped in a solution of hypochlorous acid, it first turns red then gets decolourised.