Which one of the following statements are incorrect regarding alkalimetals?
1. They all have one loosely held valence electrons in the outer most shell.
2. They form univalent, ionic and colourless compounds.
3. Their oxo salts are unstable
4. Their hydroxides and oxides are very strong bases.

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

How many of the following statements are correct for green vitriol? 1. it can be used for the preparation of Mohr's salt. 2. It is a hydrated salt and its anhydrous form is white in colour. 3. The decomposition reaction of its anhydrous form is redox in nature. 4. It is used for making fenton's reagent used as a catalyst in organic chemistry. 5. It can be used for the preparation of Potassium ferrocynide. 6. It has same number of molcules of water of crystallization as white vitriol or blue vitriol 7. It turns brownish-yellow on exposure to atmosphere. 8. Its aqueous solution is acidic in natrue due to hydrolysis. 9. Out of the decomposition products of its anhydrous form, only one can turn acidified K_(2)Cr_(2)O_(7) solution green.

Which of the following given statements is/are incorrect- (a) there are five unpaired electrons in (n-1)d subshell of Fe^(3+) , (b) the number of nodal planes in 4d_(xy) orbital is one, (c) in Ag atom 23 electrons have a spin of one type and 24 of the opposite type

Which one of the following statements are true? (1) Transition metals from alloys (2) Transition metals form complexes (3) Zn, Cd and Hg are transition metals (4) K_(2)[PtCl_(6)] is a well known compound, but corresponding nickel compound is not known.

The following diagram shown as electrochemical cell in which the respective half-cells contains aqueous 1.0M solutions of the salts XCl_(2) and YCl_(3) . Given that 3X(s)+2Y^(3+) (aq) to 3X^(2)(aq)+2Y(s) epsi_("cell") gt 0 Which of the following statements is correct? I. The electrode made from metal X has positive polarity II. Electrode Y Is the anode II. Tho flow of electrons is from Y to X IV. The reaction at electrode X is an oxidation V. The salt bridge would most likely contain silver nitrate

The elements of group 1 describe, more clearly then only group of elements, the effects of increasing the size of atoms or ions on the physical and chemical properties.The chemical and physical properties of the elements are closely related to their electronic structures and sizes.These metals are highly electropositive and thus form very strong bases, and have quite stable oxo-salts.In the manufacturing of sodium hydroxide, chlorine and sodium carbonate, the sodium chloride is used as starting material. Which of the following has the highest solubility in water ?

The elements of group 1 describe, more clearly than any other group of elements, the effects of increasing the size of atoms or ions on the physical and chemical properties.The chemical and physical properties the elements are closely related to their electronic structures and sizes.These metals are highly electropositive and thus form very strong bases, and have quite stable oxo-salts, In the manufacturing of sodium hydroxide chlorine and sodium carbonate, the sodium chloride is used as starting material. Which is not correctly matched ? (1)Basic strength of oxides , Cs_2OltRb_2OltK_2OltNa_2OltLi_2O (2)Stability of peroxides , Na_2O_2 lt K_2O_2 lt Rb_2O_2 lt Cs_2O_2 (3)Stability of bicarbonates , LiHCO_3 lt NaHCO_3 lt KHCO_3 lt RbHCO_3lt CsHCO_3 (4)Melting point , NaF < NaCl < NaBr < Nal

Which of the following statements is (are) incorrect? (i) Percentage ionic character in CsCl bond is ~55% . (Electronegativity values of Cs and Cl are 0.7 and 3.0 respectively) (ii) From H_(2)O to H_(3)O^(+) , the geometry around O atom changes drastically . (iii) The most stable oxidation state for element with atomic number 113 is expected to be +2 . (iv) The 2^("nd") ionization energy of Ca is greater than 1^("st") ionization energy of it but lower then 2^("nd") ionization energyof K.

Reaction intermdiates are short lived species and are highly reactive. They are formed by heterolytic and homolytic bond fission. There are various types of reaction intermediates in which the most important are carbocation , carbanion and free radical. Carbocation is an organic species in which carbon have positive charge and six electrons in its outermost shell. The stability of carbocation can be increased by positive inductive effect, hyperconjugation and delocalisation. If alpha -atom with respect to carbocation has one or more lone pair of electron then lone pair of electron strongly stabilises the carbocation due to octet completion. Species in which carbon have negative charge is called carbanion. Carbanion carries three bond pairs and one lone pair. The stability of carbanion can be increased by negative inductive effect, negative mesomeric effect and delocalisation. Free radical is a species which have seven electrons in its outermost shell. The stability of free radical can be increased by hyperconjugation and delocalisation. The stability order of following free radicals is: C_(6)H_(5)underset(I)CH_(2)overset(*)CH_(2)" "CH_(3)underset(II)CH_(2)overset(*)CH_(2)" "underset(" "III)(C_(6)H_(5))overset(*)CH_(2)" "underset(IV)(CH_(3)^(*)

Which of the following statement is//are correct (1) Hydrazone of an aklehyde when heated with sodium ethoxide forms alkane This is known as wolf-kishnec reaction. (2) Cannizzaro's reaction is given by those aldehydes which do not have a-hydrogen atom. (3) Two separate solution, Fehling's solution A (CuSO_(4)) and Fehling's solution B(NaOH+ roschell salt an at first mixed up together and is then heated with the aldehyde A CuO precipitate is formed. (4) Tollen's reagent gives silver mirror with acetaldehyde.