19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
When CO2 is bubbled through a solution of barium peroxide in water
Which of the following is a true structure of H2O2 in solid phase ? (a) (b) (c) (d)
On moving from left to right in a period what is the order of acidic character of hydrides?
Non-stoichiometric hydrides are produced by
Given below are the elements and the type of hydrides formed by them. Mark the incorrect match.
NaH s H O NaOH aq H g -> and 8LiH Al Cl 2LiAlH 6LiCl -> In the above reaction, NaH and LiH are the examples of
Carbon hydride of the type, CnH2n+2 do not act as Lewis acid or Lewis base. They behave as normal covalent hydrides because
…….X….. are crystalline, non-volatile and non- conducting in solid state. (X) Melts conduct electricity and on electrolysis liberate dihydrogen gas at anode. Here, X refers to
What is the reaction given below called? aq aq H O H O H O OH l l
Which of the following compounds is used for water softening? (a) Ca PO (b) Na PO (c) Na P O (d) Na HPO
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.
The hardness of water is estimated by
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 temporary hardness of water due to calcium bicarbonate can be removed by adding
The formula for permutit or zeolite which is used as softener in ion-exchange method is
The formula of exhausted permutit is
Hydrolysis of SiCl4 gives
The maximum number of hydrogen bonds formed by a water molecule in ice is
How many hydrogen bonded water molecules are associated with CuSO4.5H2O?
Given below are two reactions of water with sodium and carbon dioxide. What is the nature of water in these reactions? (i) 2Na + 2H2O -> 2NaOH + H2 (ii) 6CO2 + 12H2O -> C6H12O6 + 6H2O + 6O2
In which of the following reactions H2O acts as a bronsted acid? (a) 3 aq aq 4 aq H O NH OH NH l (b) aq aq aq H O H S H O HS l (c) aq aq H O H O H O OH l l (d) aq aq H OH H O ( ) ( ) l
Which of the following statements regarding hydrides is not correct?
Match the reaction of column I with their types given in column II and mark the appropriate choice. Column I Column II (A) H O NH NH OH (i) Self ionisation of H2O (B) FeCl 3H O -> Fe(OH) 3HCl (ii) Decompositio…
The degree of hardness of water is usually expressed in terms of (AMU 2010)