19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which of the following products will be obtained when copper metal is reacted with HNO3? (AIIMS 2018)
In which of the following arrangements, the order is not strictly according to the property written against it? (AIIMS 2018)
Xenon hexafluoride reacts with silica to form a xenon compound X. The oxidation state of xenon in X is (JIPMER 2018)
Bleaching powder loses its power on keeping for a long time because (KCET 2013)
The compound represents phosgene is (Manipal 2013)
The increases order of reducing power of halogen acid is (Manipal 2013)
Aqueous solutions of hydrogen sulphide and sulphur- dioxide when mixed together, yield (KCET 2013)
The correct order of relative acidity is (UP CPMT 2013)
In pyrophosphoric acid the number of hydroxyl groups are (UP CMT 2013)
The mixture of concentrated HCl and HNO3 made in 3 : 1 ratio contains (AIIMS 2013)
Which of the following is not a peroxyl acid? (Manipal 2012)
When a colorless gas is passed through bromine water, only decolourisation takes places. The gas is (AFMC 2012)
When Cl2 gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from (CBSE AIPMT 2012) (a)zero to +1 and zero to –5
Dehydration of concentrated H2SO4 in the presence of P4O10 produces
Which of the following gases may act both as an oxidizing and a reducing agent?
Sulphur dioxide reacts with chlorine in the presence of charcoal (which acts as a catalyst) to give
H2S is less stable than H2O because
Which of the following compounds is thermodynamically unstable?
H2S turns an acidified KMnO4 solution
H2S turns an acidified K2Cr2O7 solution
Which of the following statements is correct for sulphur?
In the cyclo-S8 molecule of rhombic sulphur, all the S—S bond lengths and all the S—S—S bond angles are respectively (approximate values)
Which of the following is/are correct?
O3 cannot oxidise:
A green coloured solution of a salt changes its colour to light pink on passing ozone through it. Which of the following species represent pink and green colour respectively ?