19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
A commercial sample of hydrogen peroxide is labelled as 10 volume. Its percentage strength is nearly
The volume of oxygen liberated from 15 mL of 20 volume H2O2 is
What is the volume of “20 volume H2O2” required to get 5000 cm3 of oxygen at STP ?
What will be the mass of oxygen liberated by decomposition of 200 mL hydrogen peroxide solution with a strength of 34 g per litre ?
Which of the following equation depicts reducing nature of H2O2?
Blackened oil painting can be restored into original form by the action of
Which of the following cannot be used as a test for H2O2 ?
H2O2 is obtained by which of the following?
All the reaction between following pairs will produce hydrogen gas, except
Which of the following reactions increases the production of dihydrogen from synthesis gas? (a) 1270K Ni CH g H O CO g 3H g -> (b) 1270K C g H O CO g H g -> (c) 673K catalyst CO g H O CO g H g -> (d) 12…
Hydrogen is not obtained when zinc reacts with
The major compounds of water gas (or synthesis gas or syngas) which are used for the synthesis of methanol and a number of hydrocarbons are (a) CO H (b) CO H (c) CO N (d) CO CO H
The formula for permutit or zeolite which is used as softener in ion-exchange method is
The temporary hardness of water due to calcium bicarbonate can be removed by adding
Which of the following is not a disadvantage of using hard water?
A water sample is said to contain permanent hardness if water contains
The hardness of water is estimated by
Which gas is produced when calcium nitride (Ca3N2) is hydrolysed by water?
Number of parts by weight of calcium carbonate present in …….defined as the degree of hardness of water. Fill the blank with an appropriate statement.
Which of the following compounds is used for water softening? (a) Ca PO (b) Na PO (c) Na P O (d) Na HPO
The order of reactivity of halogens towards hydrogen is
Given below are the elements and the type of hydrides formed by them. Mark the incorrect match.
Liquid water is denser than ice due to
Which of the following represent laboratory preparation of dihydrogen?
The production of dihydrogen obtained from coal gasification can be increased by reacting carbon monoxide of syngas mixture with steam in presence of a catalyst iron chromate. What is this process called?