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2019 55 questions

Q832019 · 9 Apr 2019 · Shift 1
Excessive release of $C O_{2}$ into the atomosphere results in :
1. A.depletion of ozone
2. B.polar vortex
3. C.global warming
4. D.formation of smog
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Answer: C
Q892019 · 9 Apr 2019 · Shift 1
Magnisium powder burns in air to give :
1. A.MgO and $M g_{3} N_{2}$
2. B.MgO only
3. C. $Mg (N O_{3})_{2}$ and $M g_{3} N_{2}$
4. D.MgO and $Mg (N O_{3})_{2}$
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Answer: A
Q832019 · 9 Apr 2019 · Shift 2
The amorphous form of silica is :
1. A.kieselguhr
2. B.quartz
3. C.tridymite
4. D.cristobalite
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Answer: A
Q882019 · 9 Apr 2019 · Shift 2
Noradrenaline is a/an
1. A.Antacid
2. B.Antihistamine
3. C.Neurotransmitter
4. D.Antidepressant
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Answer: C
Q892019 · 9 Apr 2019 · Shift 2
The layer of atmosphere between 10 km to 50 km above the sea level is called as :
1. A.mesosphere
2. B.thermosphere
3. C.troposphere
4. D.stratosphere
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Answer: D
Q692019 · 8 Apr 2019 · Shift 2
The compound that inhibits the growth of tumors is :
1. A.cis- $[Pd (Cl)_{2} (N H_{3})_{2}]$
2. B.trans- $[Pd (Cl)_{2} (N H_{3})_{2}]$
3. C.cis- $[Pt (Cl)_{2} (N H_{3})_{2}]$
4. D.trans- $[Pt (Cl)_{2} (N H_{3})_{2}]$
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Answer: C
Q722019 · 8 Apr 2019 · Shift 2
The statement that is INCORRECT about the interstitial compounds is :
1. A.They are chemically reactive
2. B.They have metallic conductivity
3. C.They have high melting points
4. D.They are very hard
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Answer: A
Q772019 · 8 Apr 2019 · Shift 2
For a reaction scheme $A k_{1} B k_{2} C$ , if the rate of formation of B is set to be zero then the concentration of B is given by :
1. A. $k_{1} k_{2} [A]$
2. B. $(\frac{k _{1}}{k _{2}}) [A]$
3. C. $(k_{1} + k_{2}) [A]$
4. D. $(k_{1} - k_{2}) [A]$
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Answer: B
Q782019 · 8 Apr 2019 · Shift 2
Which of the following compounds will show the maximum 'enol' content?
1. A. $C H_{3} COC H_{3}$
2. B. $C H_{3} COC H_{2} COC H_{3}$
3. C. $C H_{3} COC H_{2} COO C_{2} H_{5}$
4. D. $C H_{3} COC H_{2} CON H_{2}$
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Answer: B
Q822019 · 8 Apr 2019 · Shift 2
If p is the momentum of the fastest electron ejected from a metal surface after the irradiation of light having wavelength $λ$ , then for 1.5 p momentum of the photoelectron, the wavelength of the light should be: (Assume kinetic energy of ejected photoelectron to be very high in comparison to work function)
1. A. $1/2 λ$
2. B. $3/4 λ$
3. C. $4/9 λ$
4. D. $2/3 λ$
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Answer: C
Q832019 · 8 Apr 2019 · Shift 2
Polysubstitution is a major drawback in:
1. A.Reimer Tiemann reaction
2. B.Friedel Craft's alkylation
3. C.Acetylation of aniline
4. D.Friedel Craft's acylation
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Answer: B
Q872019 · 8 Apr 2019 · Shift 2
0.27 g of a long chain fatty acid was dissolved in $100 c m^{3}$ of hexane. 10 mL of this solution was added dropwise to the surface of water in a round watch glass. Hexane evaporates and a monolayer is formed. The distance from edge to centre of the watch glass is 10 cm. What is the height of the monolayer? [Density of fatty acid = $0.9 g c m^{- 3}$ , $π = 3$ ]
1. A. $1 0^{- 8} m$
2. B. $1 0^{- 2} m$
3. C. $1 0^{- 4} m$
4. D. $1 0^{- 6} m$
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Answer: D
Q902019 · 8 Apr 2019 · Shift 2
The strength of 11.2 volume solution of $H_{2} O_{2}$ is : [Given that molar mass of H = $1 g mo l^{- 1}$ and O = $16 g mo l^{- 1}$ ]
1. A.3.4%
2. B.34%
3. C.13.6%
4. D.1.7%
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Answer: A
Q632019 · 12 Jan 2019 · Shift 1
The element with Z = 120 (not yet discovered) will be an/a -
1. A.Alkaline earth metal
2. B.Alkali metal
3. C.Transition metal
4. D.Inner transition metal
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Answer: A
Q642019 · 12 Jan 2019 · Shift 1
What is the work function of the metal if the light of wavelength $4000 \overset{˚}{A}$ generates photoelectrons of velocity $6 \times 1 0^{5} m s^{- 1}$ from it ? (Mass of electron $= 9 \times 1 0^{- 31} kg$ ; Velocity of light $= 3 \times 1 0^{8} m s^{- 1}$ Plank's constant $= 6.626 \times 1 0^{- 34} Js$ ; Charge of electron $= 1.6 \times 1 0^{- 19} Je V^{- 1}$ )
1. A. $4.0 eV$
2. B. $0.9 eV$
3. C. $2.1 eV$
4. D. $3.1 eV$
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Answer: C
Q722019 · 12 Jan 2019 · Shift 1
The hardness of a water sample (in terms of equivalents of $CaC O_{3}$ ) containing $1 0^{- 3} M CaS O_{4}$ is (Molar mass of $CaS O_{4} = 136 g mo l^{- 1}$ )
1. A. $90 ppm$
2. B. $100 ppm$
3. C. $50 ppm$
4. D. $10 ppm$
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Answer: B
Q802019 · 12 Jan 2019 · Shift 1
$M n_{2} (CO)_{10}$ is an organometallic compound due to the presence of -
1. A. $C - O$ bond
2. B. $Mn - Mn$ bond
3. C. $Mn - O$ bond
4. D. $Mn - C$ bond
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Answer: D
Q672019 · 12 Jan 2019 · Shift 2
The element that does NOT show catenation is :
1. A.Ge
2. B.Si
3. C.Sn
4. D.Pb
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Answer: D
Q732019 · 12 Jan 2019 · Shift 2
The increasing order of the reactivity of the following with $LiAl H_{4}$ is (A) $C_{2} H_{5} CON H_{2}$ (B) $C_{2} H_{5} COOC H_{3}$ (C) $C_{2} H_{5} COCl$ (D) $C_{2} H_{5} CO - O - CO C_{2} H_{5}$
1. A.A < B < C < D
2. B.B < A < C < D
3. C.B < A < D < C
4. D.A < B < D < C
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Answer: D
Q762019 · 12 Jan 2019 · Shift 2
The element that shows greater ability to form $p π$ - $p π$ multiple bonds, is :
1. A.Si
2. B.Ge
3. C.C
4. D.Sn
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Answer: C
Q872019 · 12 Jan 2019 · Shift 2
The volume strength of 1M $H_{2} O_{2}$ is : (Molar mass of $H_{2} O_{2} = 34 g mo l^{- 1}$ )
1. A.5.6
2. B.22.4
3. C.11.35
4. D.16.8
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Answer: C
Q902019 · 12 Jan 2019 · Shift 2
Among the following the false statement is -
1. A.Lyophilic sol can be coagulated by adding an electrolyte
2. B.Tyndall effect can be used to distinguish between a colloidal solution and a true solution
3. C.It is possible to cause artificial rain by throwing electrified sand carrying charge opposite to the one on clouds from an aeroplane
4. D.Latex is a colloidal solution of rubber particles which are positively charged
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Answer: D
Q652019 · 11 Jan 2019 · Shift 2
The reaction, $MgO (s) + C (s) \to Mg (s) + CO (g)$ , for which $Δ_{r} H^{\circ} = 491.1 kJ mol^{- 1}$ and $Δ_{r} S^{\circ} = 198.0 JK^{- 1} mol^{- 1}$ , is not feasible at 298 K. Temperature above which reaction will be feasible is :
1. A. $2480.3 K$
2. B. $2040.5 K$
3. C. $2380.5 K$
4. D. $1890.0 K$
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Answer: A
Q682019 · 11 Jan 2019 · Shift 2
$\underline{A} 3 \underline{B} 2 \underline{C} 4 KOH, O_{2} (Green) 2 \underline{B} + 2 H_{2} O 4 HCl (Purple) 2 \underline{C} + Mn O_{2} + 2 H_{2} O H_{2} O, KI (Brown) 2 \underline{A} + 2 KOH + \underline{D}$ In the above sequence of reactions, $\underline{A}$ and $\underline{D}$ , respectively, are :
1. A. $KI$ and $KMn O_{4}$
2. B. $KI$ and $K_{2} Mn O_{4}$
3. C. $KI O_{3}$ and $Mn O_{2}$
4. D. $Mn O_{2}$ and $KI O_{3}$
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Answer: D
Q792019 · 11 Jan 2019 · Shift 2
1. A.(b), (c) and (d)
2. B.(a) and (e)
3. C.(a) and (d)
4. D.(a)
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Answer: A