1.η and l values of an orbital A are 3 and 2,and of another orbital B are 5 and 0. Then, the energy of
(a) B is more than A (b) A is more than B
.(c)A and B are of same energy (d) none of the above.
2. Email volumes of two gases don’t react together are confined in, separate vessels. Their pressure is 100 mm and 30 mm of Hg, respectively. If the two Vessels are joined together, then what will be the pressure of the resulting mixture? (Temperature remains constant)
(a)400 mm ( b)√400
(c)300 mm (d) 200 mm
3. When calomel reacts with NH4OH, we get
(a) Hg20 (b) HgO
(c) HgNH2CI (d) NH2—Hg—Hg—Cl.
4. A salt is formed when a weak acid of dissociation constant 10-4 and weak base of dissociation constant 1O-5 are mixed. The pH and degree of hydrolysis of salt solution are
(a) 5, 1% (b) 7,12%
(c) 6.5, 0.3% (d) 0.3, 6.5%
5. The maximum kinetic energy of photoelectrons ejected from a metal is x when it is irradiated with radiation having frequency twice the threshold frequency. 11 frequency of the incident radiation is doubled, the maximum kinetic energy of the photoelectrons would become
(a) x (b) 2x
(c) 3x (d) 4x
6. Match the List-I with List-U and select the correct answer using the options given below the lists.
List-I. List-Il
(A) -and -glucose 1. mutarotation
(B) (+) and (—)-glucose 2. enantiomers
(C) D- and L-glucose 3. anomers
(D) a-form ‘. open 4. configurational
chain form ., – n-form isomers
(a) A-2; B-3; C-4;D-1 (b) A-2; B-3; C-1; D-4
(c) A-3; B-2; C-4; D-1 (d) A-3; B-2; C-1; D-4
7. The major organic’ product formed from the following reaction.
8. The correct increasing order of Para magnetism of
i. MnSO4-4H2O ii . FeSO4•7H2O:
iii. NiS04-6H2O iv. CuSO45H2O
(a) (i) < (ii) < (iii) < (iv)
(b) (iv) < (iii) < (ii) < (i)
(c) (iti) < (iv) < (ii) < (1)
(d) (iii) <(iv) <(i) < (ii)
9.
10. Which of the following configuration is associated with biggest jump between 2nd and 3rd IE?
11. Identify the, correct statement.
(a) Plaster of Paris can be obtained by hydration of gypsum
(b) Plaster of Paris is obtained by partial oxidation of gypsum
(c) Gypsum contains a lower percentage of calcium than Plaster of Paris
(d) Gypsum is obtained by heating Plaster of Paris.
12. Salts of A (atomic weight 7), B (atomic weight 27) and C (atomic weight 48) were electrolysed under identical conditions using the same quantity of electricity It was found that when 2.1 g of A was deposited, the weights of and C deposited were 2.7 g and 7.2 g. The valencies if A, B and C are respectively
(a) 3,l and 2 (b)1,3 and 2
(c) 3,l and 3 (d)2,3 and 2
13. If NaOH is added to an aqueous solution of Zn2+ ions, a white precipitate appears and on adding excess NaOH, the precipitate dissolves. In this solution zinc exists in the
(a) Cationic part (b) anionic part
(c) both in cationic, and anionic parts (d) there is no zinc left in the solution
14. Sometimes a yellow turbidity appears while passing H2S gas even in the absence of II group
radicals. This is because
(a) sulphur is present in the mixture as impurity
(b) IV group radicals are precipitated as sulphides
(c) of the oxidation of H2S gas by some acid radicals
(d) III group radicals are precipitated as hydroxides
15. An organic liquid A containing C, H and 0 has a pleasant odour with a b.p. of 78°C. On boiling A. with conc. H2S04 a colourless gas is produced which decolourises bromine water and alkaline KMnO4. One mole of this gas also takes One mole of H2. The organic liquid A is
16. Match the lists I and II and pick the correct matching from the codes given below
17. Nucleophibcity order is correctly represented by
18. The correct statement about the compounds I, II and III.
(a) I and II are identical (b). I and II are diastereomers
(c) I and III are enantiomers (d) I and II are enantiomers.
19.
.
20. A greenish yellow gas reacts with an alkali metal hydroxide to form a halite which can be used in fire works and safety matches. The gas an4 halite
respectively- are
21. In nitrogen family, the H – M – H bond angle in the hydrides gradually becomes closer o 90° on
going form N to Sb. This shows that gradually
(a) the basic strength of hydrides increases
(b) almost pure. p-orbital are used for M — H bonds
(c) the bond energies of M — H bonds increase
(d) the bond pairs of electrons become nearer to the central atom.
22. At 373 K, a gaseous reaction A →2B+C’is found to be of first order. Starting with pure A, the total pressure at end of 10 min was 176 mm and after a long. time when A was completely dissociated, it was 270 mm. The pressure of A at the estdo1Ominutes1was’
(a) 94 mm (b) 47 mm
(c) 43 mm (d) 90mm
23. 0.44 g of a colourless oxide of nitrogen occupies 24 mL at STP. The compound is
(a) N2O (b) NO (c) N202 (d) NO2
24. If Po and Ps are the vapour pressures of the solvent and solution respectively, n1 and n2 are the mole fractions of of the solvent and solute respectively, then
25.
.
26.
(a) 150 K (b) 75 K (c) 100 K (d) 200 K
27. A binary solid (A+B-) a zinc blende structure with B-ions constituting g the lattice and A+ ions occupying 25% tetrahedral holes. The formula of slid is
(a)AB (b)A2B (c) AB2 (d) AB4
28. Which statement is correct?
(a) BCl3 and AICl3 are both Lewis acids and BCl3 is stronger than AICl3
(b) BCl3 and A1Cl3 are both Lewis acids and AlCl3 stronger than BCl3
(c) Cl3 and A1Cl3 are both equally strong Lewis acids.
(d) Both BCl3and AlCl3 are not Lewis acids
29. Among the compounds;
1. a):A is 3d and. B is 5s; for both is 5 and thus lower value of n decides lower energy level.
2.
3. (C) : When calomel reacts with NH40H, it black due to the formation of a mixture of mercury and mercuric amino chloride.
4. (c) : For a salt of weak add and weak base
5.
6.
7.
8.(b): (5 unpaired electrons)
4 unpaired electrons)
2 unpaired electrons)
(1 unpaired electron)
9.(b):
10. (C) : The jump m ionization energy occurs when valence shell changes during removal of electron.
11. (c) : Gypsum is CaSO4•H2O and Plaster of Paris is 2(CaSO4).H20. Therefore gypsum contains a lower percentage of calcium than Plaster of Paris.
12.
13.
17. (c): Lesser the electro negativity of. the donor atom, more is its tendency to give a lone pair of electrons, more is its nucleophilicity. Thus, order of nucleophilicity is
]
18.(d): If we rotate II by 180° in the plane of paper then we get a mirror image of I.
19. (d): Oxidation state of
Colour of salts is a property of partially filled d-orbital. Since Ti has, empty d-subshell and Cu2Cl2 involves completely filled d-sub shell these are colourless, salts.
20. (b):
KC1O3 is used in fire works and safety matches as an oxidizing agent.
21. (b): On moving down the group, e1ectronegetivity decreases, consequently bond paw shifts more-and more away from the central atom. HenceH-M-H. Bond angle decreases and becomes closer to 9O0 in SbH3 which reveals that almost pure p-orbitals are used for M-H bonding..
28. (a) : BCI3 and AICI3 both are electron deficient compounds and can accept lone pair to act as Lewis acid. Also BCI3 involves smaller boron atom and thus, attracts electron pair -more easily.
29. (b): Aromatic amines are less basic than aliphatic amines. Also presence of electron attracting group decreases the basic character of aromatic amines.