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If hydrogen sulphide gas is passed through an acidified solution containing a mixture of the sulphates of cadmium, nickel and zinc, which sulphide /sulphides will be precipitated:
Consider the coordination compound, K2[Cu(CN)4]. A coordinate covalent bond exists between
Reaction of Cu metal with conc. HNO3 will produce Cu(NO3)2 and:
Among the three allotropes of an element, one is a good electrical conductor, the second one is known to be one of the hardest materials and the third one has a molecule form with an icosahedral structure. The element is:
Which of the following interhalogen compounds does not exist:
Based on Wade’s rules of electron counting, structure of carborane, CB8H14, is expected to be:
XeF6 cannot be handled in a quartz vessel, because it reacts with SiO2 forming:
Metallic potassium on treatment with liquid NH3 in the presence of catalytic amount of Fe2O3 provides:
The structure of hyponitrous acid molecule (H2N2O2) is:
Correct Answer :- C
Explanation : Trans and cis are the two possible structures of hyponitrous acid. White crystals are obtained from trans-hyponitrous which are explosive when dry and it is a weak acid which decomposes to nitrous oxide when in aqueous solution. Sodium salt can be obtained from cis acid.
What are A, B and C in the following reactions:
Here A, B and C respectively are:
Which one of the following contain (3c–2e) bonds:
Which ones of the following compounds do not exist:
Correct Answer :- option B
Explanation : a) The existence and structure of this novel compound was revealed from a single-crystal structure determination where it exists as [AuXe4][Sb2F11]2.
b) Beryllium chloride is an inorganic compound with the formula BeCl2. It is a colourless, hygroscopic solid that dissolves well in many polar solvents. Its properties are similar to those of aluminium chloride, due to beryllium's diagonal relationship with aluminium.
c) Argon difluoride, ArF2, is predicted to be stable at pressures over 57 GPa. It should be an electrical insulator.
d) It exist as HeF-.
Among the molecules, BiF3, BiCl3 BiBr3 and BiI3, the one which is most coloured is:
Given the following reaction conditions for the formations of the fluorides of Xe:
In the preparation of P4O6, a mixture of N2 and oxygen is used instead of pure oxygen. The reason is:
Arsenic, antimony and bismuth react with concentrated HNO3. These give respect ively:
One mole of magnesium nitride on the reaction with an excess of water gives
One mole of magnesium nitride on the reaction with an excess of water gives two moles of ammonia and 3 moles of magnesium hydroxide.
Solution of alkali metals in liquid NH3 conducts electricity. It is due to formation of:
How many moles of P4O10 will react with one mole of water:
The coefficients in the balanced chemical equation provide us with information that we can use to build this conversion factor. They tell us that six molecules of H2O are needed to react with one molecule of P4O10 in order to produce four molecules of phosphoric acid: