1. The INCORRECT statement is:
1) Cast iron is used to manufacture wrought iron.
2) Brass is an alloy of copper and nickel.
3) German silver is an alloy of zinc, copper and nickel.
4) Bronze is an alloy of copper and tin
Answer: 2
Brass – (copper Zinc)
Bronze – (copper tin)
1) [Ni(CN)4]2- (square planar)
2) Ni(CO)4(Td)
3) [MnBr4]2-(Td)
4) [NiCl4]2-(Td)
Answer: 3
[MnBr4]2–
1) Kc= Kp(RT)1/2
2) Kc= Kp(RT)-1/2
3) Kc= Kp(RT)3/2
4) Kc= Kp(RT)
Answer: 1
Δng =1-3/2 = -1/2
(Kp/Kc)= (RT)Δng = (RT)-1/2
Kc= Kp/(RT)-1/2 = Kp.(RT)1/2
4. Consider the following reactions:
‘A’ is:
5. Arrange the following solutions in the decreasing order of pOH:
(A) 0.01 M HCl
(B) 0.01 M NaOH
(C) 0.01 M CH3COONa
(D) 0.01 M NaCl
1) (A) > (C) > (D) > (B)
2) (B) > (D) > (C) > (A)
3) (B) > (C) > (D) > (A)
4) (A) > (D) > (C) > (B)
Answer: 4
(i) 10–2 M HCl ⇒ [H+] = 10–2 M → pH = 2
(ii) 10–2 M NaOH ⇒ [OH–] = 10–2 M → pOH = 2
(iii) 10–2 M CH3COO–Na+⇒ [OH+] > 10–7 ⇒ pOH < 7
(iv) 10–2 M NaCl ⇒ Neutral pOH = 7
(i) > (iv) > (iii) > (ii)
6. The variation of equilibrium constant with temperature is given below :
Temperature Equilibrium Constant
T1= 250C K1= 10
T2= 1000C K2= 100
The value of ∆H0 , ∆G0 at T1 and ∆G0 at T2 (in Kj mol-1) respectively, are close to
[use R = 8.314JK-1 mol-1]
1) 28.4, -7.14 and -5.71
2) 0.64, – 7.14 and -5.71
3) 28.4, – 5.71 and -14.29
4) 0.64, – 5.71 and -14.29
Answer: 3
∆G0T1 = –RT1ln(K1) = –298R ln(10) = –5.71 kJ mol–1
∆G0T2= –RT2ln(K2) = –373R ln(100)
= –14.283 kJ/mol
7. Consider the following reactions
A→ P1; B→ P2; C→ P3; D →P4,
The order of the above reactions are a,b,c and d, respectively. The following graph is obtained when log[rate] vs. log[conc.] are plotted.
Among the following the correct sequence for the order of the reactions is:
1) c > a > b > d
2) d > a > b > c
3) d > b > a > c
4) a > b > c > d
Answer: 3
A→ P1; B→ P2; C→ P3; D →P4,
Rate= K(conc)order
Solution
1) 2-methylpent-1-ene
2) 4-methylpent-2-ene
3) 2-methylpent-2-ene
4) 4-methylpent-1-ene
10. The lanthanoid that does NOT shows +4 oxidation state is:
1) Dy
2) Ce
3) Tb
4) Eu
Answer: 4
Fact
11. The major products of the following reactions are:
12. The major product of the following reaction is:
13. The increasing order of pKb values of the following compounds is:
14. kraft temperature is the temperature :
1) Above which the aqueous solution of detergents starts boiling
2) Below which the formation of micelles takes place.
3) Above which the formation of micelles takes place.
4) Below which the aqueous solution of detergents starts freezing.
Answer: 3
TK+ temp. above which formation of micelles takes place.
15. The set that contains atomic numbers of only transition elements, is?
1) 9, 17, 34, 38
2) 21, 25, 42, 72
3) 37, 42, 50, 64
4) 21, 32, 53, 64
Answer: 2
Tranition elements = 21 to 30
37 to 48
57 & 72 to 80
Ans. 21, 25, 42 & 72
16. Consider the Assertion and Reason given below.
Assertion (A): Ethene polymerized in the presence of Ziegler Natta Catalyst at high temperature and pressure is used to make buckets and dustbins.
Reason (R): High density polymers are closely packed and are chemically inert. Choose the correct answer from the following:
1) (A) and (R) both are wrong.
2) Both (A) and (R) are correct and (R) is the correct explanation of (A)
3) (A) is correct but (R) is wrong
4) Both (A) and (R) are correct but (R) is not the correct explanation of (A)
Answer: 2
From ziegler – Natta catalyst HDPE is produced, HDPE is closely packed and are chemically inert, so used to make backet and dust.
1)
2)
3)
4)
Answer: 4
1) Liquid dinitrogen is not used in cryosurgery.
2) N2 is paramagnetic in nature
3) It can combine with dioxygen at 250 C
4) It can be used as an inert diluent for reactive chemicals.
Answer: 4
(1) Liquid nitrogen is used as a refrigerant to preserve biological material food items and in cryosurgery.
(2) N2 is diamagnetic, with no unpaired elctrons.
(3) N2 does not combine with oxygen, hydrogen or most other elements. Nitrogen will combine with oxygen, however; in the presence of lightining or a spark.
(4) In iron and chemical Industry inert diluent for reactive chemicals.
1) Poor and high
2) High and high
3) Poor and poor
4) High and poor
Answer: 2
Order of solubility of sulphate of Alkaline earth metals
BeSO4> MgSO4 > CaSO4 > SrSO4> BaSO4
20. The presence of soluble fluoride ion upto 1ppm concentration in drinking water, is:
1) Harmful to skin
2) Harmful to bones
3) Safe for teeth
4) Harmful for teeth
Answer: 3
Environmental chemistry – safe for teeth
Answer: 750
P × 144 × 12 = 48 × 9 × 3 × 10–3
P = (27/36) x 10-3
P = 750 × 10–6 bar
22. The elevation of boiling point of 0.10m aqueous CrCl3 xNH3 solution is two times that of 0.05 m aqueous CaCl2 solution. The value of x is……………..
[Assume 100% ionisation of the complex and CaCl2, coordination number of Cr as 6, and that all NH3 molecules are present inside the coordination sphere]
Answer: 5
∆Tb = i × Kb × m
i × 0.1 × Kb = 3 × 0.05 × Kb × 2
i = 3
[Cr(NH3)5. Cl] Cl2 →[Cr(NH3)5Cl]+2 + 2Cl–x = 5
23. Potassium chlorate is prepared by the electrolysis of KCl in basic solution
6OH– + Cl– -> ClO3– + 3H2O + 6e–
If only 60% of the current is utilized in the reaction, the time (rounded to the nearesthour) required to produce 10g of KClO3 using a current of 2A is ………….
(Given: F = 96,500 C mol-1; molar mass of KClO3=122g mol-1)
Answer: 11
t(hr) =
= 11 hours
24. In an estimation of bromine by Carius method, 1.6 g of an organic compound gave 1.88 g of AgBr. The mass percentage of bromine in the compound is……. .(Atomic mass, Ag=108, Br=80 g mol–1)
Answer: 50 %
Carius method
= (1.88/1.6) x (80/188) x 100 = 15040/300.8 = 50 %
25. The number of Cl = O bonds in perchloric acid is, “……………”
Answer: 3
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