Regarding aluminium the wrong statement is
It reacts with both acids and bases
Its maximum covalency is 6
It is a strong reducing agent
It becomes passive with conc. HCI

Both Be and Al become passive on reaction with conc. nitric acid due to-

A,B and C are oxides of elements X,Y and Z respectively. X,Y and Z are in the same period of the periodic table. A gives an aqueous solution which turns blue litmus red. B reacts with both strong acids and strong alkalies. C gives an aqueous solution which is strongly alkaline. Which of the following statement is/are true ? (P) All the three elements are metals. (Q) The electronegativites decreases from X to Y to Z. (R) The atomic radius increases in the order X lt Y lt Z . (S) X,Y and Z could be phosphorus, aluminium and sodium respectively.

Which of the following set is having correct statements here regarding both B and Al? 1. They react with HCl to form chlorides 2. Both boron and aluminium react with nitrogen. 3. They burn in oxygen to give oxides at high temperature 4. Their halides are Lewis acids

Volumetric titrations involving KMnO_(4) , are carried out only in presence of dilute H_(2)SO_(4) but not in the presence of HCI or HNO_(3) This is because oxygen produced from KMnO_(4) + dil: H_(2)SO_(4) , is used only for oxidizing the reducing agent. Moreover, H2SO4 does not give any oxygen of its own to oxidize the reducing agent. In case HCI is used, the oxygen produced from KMnO_(4) + HCI is partly used up to oxidize HCI and in case HNO_(3) is used, it itself acts as oxidizing agent and partly oxidizes the reducing agent. KMnO_(4) , in various mediums gives following products Mn^(7+)overset(H^(+))toMn^(2+) Mn^(7+)overset(H_(2)O)toMn^(4+) Mn^(7+)underset(OH^(-))toMn^(6+) QThe number of moles of KMnO_(4) that will be needed to react with one mole of sulphite in an acidic solution is

The small size and high charge of Al^(3+) ion gives it a high charge density which is responsible for its tendency to show (a) covalency in its compounds in the gaseous state (b) high hydration energy which stabilizes its compounds in solution, and (c) high lattice energy of its compounds in the solid state. Thus aluminium can forms both covalent and ionic bond. Like halides of boron, halides of aluminium do not show back bonding because of increase in size of aluminium. Actually aluminium atoms complete their octets by forming dimers. Thus chloride and bromide of aluminium exist as dimers, both in the vapour state and in polar-solvents like benzene while the corresponding boron halides exists as monomer. In boron trihalides the extent of back bonding decreases with increases with increase in size of halogens and thus lewis acid character increases. All BX_(3) are hydrolysed by water but BF_(3) shows a different behaviour. Which of the following statements about anhydrous aluminium chloride is correct ?

Nucleophilic substitution reactions generally expressed as Nu^(-) +R-L rarr R-Nu +L^(-) Where Nu^(-) rarr Nucleophile , R-L rarr substrate, L rarr leaving group The best leaving groups are those that become the most stable ions after they depart. since most leaving group leave as a negatibe ion, the best leaving groups are those ions that stabilize a negative charge most effectively. A good leaving group should be (a) electron-withdrawing to polarize the carbon (b) stable once it has left (not a strong base) (c) polaristable to maintain partial bonding with the carbon in the transition state (both S_(N)1 and S_(N)2) . This bonding helps to stabilise the transition state and reduces the activation energy. Among the following which is false statement?

SOCl_(2) + HOH rarr [X] + [Y] Which of the following is // are incorrect statements ( s) ? (I) One of the products in a gas having sp^(3)d hybridization. (II) Both the products are strong acids. (II) One of the product has one p pi - d pi bond. (IV) One of the product when react with NH_(3) gives white fumes.

Consider the following statements and pick out the wrong one. (1)The solubility, thermal stability and the basic character of the hydroxides of alkaline earth metals increases from Mg(OH)_2 to Ba(OH)_2 (2)The dehydration of hydrated chlorides, bromides and iodides of Ca,Sr and Ba can be achieved on heating. (3)The chlorides of both beryllium and aluminium are soluble in organic solvents and are strong lewis acids.

The strength of H_(2)O_(2) is expressed in several ways like molarity, normality,% (w/V), volume strength, etc. The strength of "10 V" means 1 volume of H_(2)O_(2) on decomposition gives 10 volumes of oxygen at 1 atm and 273 K or 1 litre of H_(2)O_(2) gives 10 litre of O_(2) at 1 atm and 273 K The decomposition of H_(2)O_(2) is shown as under : H_(2)O_(2)(aq) to H_(2)O(l)+(1)/(2)O_(2)(g) H_(2)O_(2) can acts as oxidising as well as reducing agent. As oxidizing agent H_(2)O_(2) is converted into H_(2)O and as reducing agent H_(2)O_(2) is converted into O_(2) . For both cases its n-factor is 2. :. "Normality " "of" H_(2)O_(2) " solution " =2xx "molarity of" H_(2)O_(2) solution 40 g Ba(MnO_(4))_(2) (mol.mass=375) sample containing some inert impurities in acidic medium completely reacts with 125 mL of "33.6 V" of H_(2)O_(2) . What is the percentage purity of the sample ?

B+underset(conc.)(HNO_(3))tounderset("white solid")(A)+underset("brown gas")(B) How many of the following statements are correct regarding products (A) & (B) ? (1) (A) can be prepared by reacting borax with dilute acids. (2) (A) is a weak monobasic lewis acid. (3) (A) behaves like an electrolyte when dissolved in water. (4) (A) can be prepared by reacting colemanite, SO_(2) & H_(2)O (5) (B) is paramagnetic in nature. (6) (B) is a mixed anhydride. (7) (B) does not forms a dimer (8) (B) reacts with NaOH(aq) undergoing disproportionation. (9) Bond angle about central atom is greater in (A) than in (B) . (Assume atom forming maximum number of bonds as central atom)