Statement I: | Acid strength increases in the order given as HF < HCl < HBr < HI. |
Statement II: | As the size of the elements F, Cl, Br, I increases down the group, the bond strength of HF, HCI, HBr, and HI decreases and so the acid strength increases. |
1. | Statement I is correct and Statement II is incorrect | |
2. |
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3. | Both Statement I and Statement II are correct. | |
4. | Both Statement I and Statement II are incorrect. |
Choose the incorrect statement among the following regarding noble gases:
1. | Noble gases have weak dispersion forces. |
2. | Noble gases have large positive values of electron gain enthalpy. |
3. | Noble gases are sparingly soluble in water. |
4. | Noble gases have very high melting and boiling points. |
In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it?
1. | NH3 < PH3 < AsH3 < SbH3 | Increasing acidic character |
2. | CO2 < SiO2 < SnO2 < PbO2 | Increasing oxidizing power |
3. | HF < HCl < HBr < HI | Increasing acidic strength |
4. | H2O < H2S < H2Se < H2Te | Increasing pKa values |
Nitrogen form , but phosphorous form , it's at a time convert in , reason is:
1. Triple bond present between phosphorous atoms.
2. bonding is weak in phosphorous.
3. bonding is strong in phosphorous.
4. Multiple bonds easily form phosphorous.
In X- H ----- Y, X, and Y both are electronegative elements. The correct statement among the following is:
1. | Electron density on X will increase and on H will decrease. |
2. | In both electron density will increase. |
3. | In both electron density will decrease. |
4. | On X electron density will decrease and on H increases. |
Incorrect statement among the following is:
1. | Among halide ions, iodide is the most powerful reducing agent. |
2. | Fluorine is the only halogen that does not show a variable oxidation state. |
3. | HOCl is a stronger acid than HOBr |
4. | HF is a stronger acid than HCl |
The correct statement among the following is:
1. | Silicon exhibits 8 coordination numbers in its compound. |
2. | The bond energy of F2 is less than Cl2. |
3. | Mn(III) oxidation state is more stable than Mn (II) in an aqueous state. |
4. | Elements of 15th gp show only + 3 and + 5 oxidation states. |
General behavior of is:
1. To give electrons
2. To Give
3. Reaction with
4. To accept electrons
A compound having two direct bonds between P and H atoms is:
1.
2.
3.
4.
Oxidation number of P in pyrophosphoric acid is:
1. +5
2. +2
3. +3
4. +4