Friday, 19 August 2016

UHS MCAT Chemistry Past Papers 2015

Looking for the uhs past papers of 2015 ofChemistry  portion? If yes then you are at right page because here we have published UHS MCAT Chemistry  Past Papers 2015.
UHS MCAT MCAT Chemistry Past Papers 2015

45- ‘Ka` values of few organic acids are given :
The order of acid strength is :
  1. A) CCL3COOH>CHCl2COOH > CH2ClCOOH > CH3COOH
  2. B) CH3COOH>CHCl2COOH>CCl3COOH>CH2ClCOOH
  3. C) CHCl2COOH > CH3COOH > CCl3COOH > CH2ClCOOH
  4. D) CCl3COOH > CH3COOH> CHCl2COOH>CH2CLCOOH
46- An organic acid ‘z` reacts separately with sodium bicarbonate , sodium hydroxide and sodium carbonate. Which one of the following represent the structure of ‘z`
  1. HCOOC2H5
  2. CH3-CH=CH2
  3. CH3CH2OH
  4. H3C-CH2-COOH
47- Carboxylic acids are rather hard to reduce, which powerful reducing agent can be used to convert them to the corresponding primary alcohol
  1. H2SO4/HgSO4
  2. V2O5
  3. LiAlH4
  4. K2Cr2O7/H2SO4
48-
The Structure is
  1. Gly-Ala (dipeptide)
  2. Asp-Gly (dipeptide)
  3. Gly-Val (dipeptide)
  4. Asp-Val (Dipeptide)
49- Which one of the following structures shows the correct formula of glutamic acid ?
50-  Select the correct zwitter ionic structures of an amino acid ?
51- Which one of the following amino acids is basic in nature ?
  1. Glycine
  2. Alanine
  3. Lysine
  4. Glutamic acid
52- The structural formula for alanine is

53- How many moles of sodium are present in 0.1g of sodium?
  1. 3 × 10-3
  2. 03× 10-1
  3. 01× 10-2
  4. 3× 10-2
54- With the help of spectral data given calculate the mass of Neon and encircle the best option. (Percentage of10 Ne 20 , 21Ne21 and 10Ne22 are 90.92%,0.26% and 8.82% respectively)
  1. 18amu
  2. 18amu
  3. 18amu
  4. 20amu
55- Which graph represents Boyle`s law
56- If the volume of a gas collected at a temperature of 600C and pressure of 1.05×105 Nm-2 is 60dm3 what would be the volume of gas at STP (P=1.01×103Nm-2,T=273K)?
  1. 25cm3
  2. 75cm3
  3. 100cm3
  4. 51cm3
57- There are four orbitals s, p, d and f. Which order is correct with respect to the increasing energy of the orbitals.
  1. 4s<4p<4d<4f
  2. 4p<4s<4f<4d
  3. 4s<4f<4p<4d
  4. 4f<4s<4d<4p

60- The half life of N2O5 at C0 is 24 minutes. How long will it take for sample of N2O5 to decay to 25% of its original concentration?
  1. 24 mins
  2. 72 mins
  3. 120 mins
  4. 48 mins
61- When the change in concentration is 6×10-4  moldm-3  and time for that change is 10 seconds, the rate of reaction will be
  1. 6×10-3 moldm-3 sce-1
  2. 6 ×10-4 moldm-3 sce-1
  3. 6 ×10-2 moldm-3 sce-1
  4. 6 ×10-5 moldm-3 sce-1
62- Which one of the following will have the smallest radius?
  1. Al+3
  2. Si+4
  3. Mg+2
  4. Na+1
63- Keeping in view the size of atoms, which order is correct?
  1. N>C
  2. P>Si
  3. Ar>Cl
  4. Li>Be
64- On the basis of oxidizing power of halogens, which reaction is possible?
  1. I2+2Clà Cl2+I
  2. Br2+2I—-àI2+2Br
  3. Cl2+2FàF2+2Cl
  4. I2+2BràBr2+Br2+2I
65- Which one of the following gases is used as mixture for breathing by sea divers?
  1. Oxygen and Nitrogen
  2. Nitrogen and Helium
  3. Helium and Oxygen
  4. Helium and Hydrogen
66- [Ti(H2O)6]+3 transmits
  1. Yellow and Red light
  2. Yellow and Blue light
  3. Red and white light
  4. Red and blue light
67- Electronic configuration of Gold [Au79] is
  1. [Xe] 4f14,5d10,6s1
  2. [Xe]4f10,5d10,6s2
  3. [Xe]4f14,5d9,6s2
  4. [Xe]4f14,5d10,6s2
68- About 80% of ammonia is used for the production of
  1. Explosives
  2. Fertilizers
  3. Nylon
  4. Polymers
69- Urea is the most widely used nitrogen fertilizer in Pakistan. Its composition Is
  1. NH2CO
  2. N2H5CO2
  3. N2H4CO2
  4. N2H4CO
70- During the manufacture of nitric acid, nitric oxide is oxidized to nitrogen dioxide. This reaction is given as :
According to Le Chatelier`s Principle
  1. Reaction must not be temperature dependent
  2. Reaction must be carried out at room temperature
  3. Reaction must be carried out at low temperature
  4. Reaction must be carried out at high temperature
71- What is the  percentage of nitrogen in NH3NO3?
  1. 65%
  2. 35%
  3. 20%
  4. 58%
72- The structural formula of 2,3,4 trimethylpentane is :
73-  Which one of the following is a powerful electrophile used to attack on the electrons of benzene ring?
  1. FeCl2
  2. FeCl4
  3. Cl+
  4. Cl2
74- Order of reactivity of alkenes with hydrogen halide is
  1. HBr>HI>HCl
  2. HI>HBr>HF
  3. HF>HI>HCl
  4. HI>HBr>HCl
75- The given three hydrocarbons are
  1. Alicyclic hydrocarbons
  2. Aromatic hydrocarbons
  3. Acyclic Hydrocarbons
  4. Heterocyclic hydrocarbons
76- The IUPAC name of the given compound is
  1. 1-Chloro-2-methylpropane
  2. 1-Chloro-2-methylbutane
  3. Isobutyl chloride
  4. 2-Methyl-3-chloropropane
77-
In the above reaction, the configuration of product is
  1. 100% same of the configuration of reactant
  2. 50% retained
  3. 50% inverted
  4. 100% opposite from configuration of reactant
78- Which one of the following was used as one of the earliest antiseptic and disinfectant?
  1. Phenol
  2. Ether
  3. Ethanol
  4. Methanol
79- Which one of the following is NOT able to denature the ethanol?
  1. Methanol
  2. Lactic acid
  3. Pyridine
  4. Acetone
80- How will you distinguish between methanol and ethanol?
  1. By lucas test
  2. By silver mirror test
  3. By oxidation
  4. By idoform test
81- To produce absolute alcohol(100%) from rectified spirit (95.6% alcohol), the remaining 4.4% water must be removed by a drying agent such as
  1. Calcium oxide
  2. Calcium chloride
  3. Calcium carbonate
  4. Carbon monoxide
82- Which one of the following is also called silver mirror test?
  1. Fehling`s soloution test
  2. Idoform test
  3. Tollen`s reagent
  4. Benedict`s solution tests
83- When acetaldehyde reacts with 2,4-dinitrophenylhydrazine (2,4-DNPH), which one of the following products is formed
84- Both aldehydes and ketones are planer to the neighborhoods of carbonyl (C=O) group. Which one of the following bonds is distorted towards the oxygen atoms?
  1. Π bond of C and O
  2. Sigma bond of C and H
  3. Sigma bond of C and O
  4. Sigma bond of C and C
85- in the given  formula which one is alpha carbon atom ?
  1. 1
  2. 3
  3. 2
  4. 4
86- The specific substances (metabolite) that fits on the enzyme surface and is converted to products is called
  1. Co-factor
  2. Prosthetic group
  3. Isoenzyme
  4. Substrate
87- Polymide is formed due to the condensation od hexane-dioic acid with
  1. Hexane-1,5-diamine
  2. Hexane-1,6-diamine
  3. Hexane-1,4-diamine
  4. Hexane-2,5-diamine
88- Haemoglobin is a
  1. Genetic protein
  2. Building protein
  3. Transport protein
  4. Structural protein
89- Which one of the following polymer is polystyrene
90- Out of these which nitrogen base is NOT present in DNA
  1. Adenine
  2. Guanine
  3. Uracil
  4. Thymine
91- Which one of the  following is an example of co-polymer?
  1. Polyamide
  2. Polystyrene
  3. Polyvinyl acetate
  4. Polyvinyl chloride
92- The biggest source of acid rain is the oxide of
  1. N
  2. S
  3. O
  4. C
93- Burning of which one of the following waste is considered as useful industrial fuel or to produce electricity
  1. Metals
  2. Grass
  3. Paper
  4. Plastic

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