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.

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?

4. 3 × 10^-3
5. 03× 10^-1
6. 01× 10^-2
7. 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)

22. 18amu
23. 18amu
24. 18amu
25. 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+2F^–àF²+2Cl^–
4. I²+2Br^–àBr²+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

---

You may also like:

• Newer Post
• Older Post

This is the post on the topic of the UHS MCAT Chemistry Past Papers 2015. The post is tagged and categorized under in Education News, mcat, mcat pastpapers, mcat prepration, mcatecat, Pastpapers Tags. For more content related to this post you can click on labels link.

You can give your opinion or any question you have to ask below in the comment section area. Already 0 people have commented on this post. Be the next one on the list. We will try to respond to your comment as soon as possible. Please do not spam in the comment section otherwise your comment will be deleted and IP banned.