Test: Variant #2 of the University Scholarship Examination

Vestnik: CAU Scholarship Examination | Mavzudagi savollar: 50 | Fan: Bio+Chem

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Mavzu savollari

1

An element has two naturally occurring isotopes. Isotope A has a mass of 10.01 amu and an abundance of 20%. Isotope B has a mass of 11.01...

Variantlar: 4

2

Which of the following elements is the most electronegative according to the Pauling scale?

Variantlar: 4

3

Which of the following molecules has a non-zero dipole moment (is polar)?

Variantlar: 4

4

Balance the following equation in an acidic medium: Cr₂O₇²⁻ + Fe²⁺ → Cr³⁺ + Fe³⁺. What is the coefficient of Fe²⁺ in the balanced equation?

Variantlar: 4

5

How many molecules are present in 9 grams of water (H₂O)? (Molar mass of H₂O = 18 g/mol, Nₐ = 6.02 × 10²³)

Variantlar: 4

6

In the reaction N₂ + 3H₂ → 2NH₃, if 28 g of Nitrogen reacts with excess Hydrogen and produces 17 g of Ammonia, what is the percentage yie...

Variantlar: 4

7

What is the mass of Sulfuric acid (H₂SO₄) required to prepare 500 grams of a 10% solution by mass?

Variantlar: 4

8

Which pair of aqueous solutions will produce a precipitate when mixed?

Variantlar: 4

9

Which of the following salts will undergo hydrolysis to form an acidic solution (pH < 7)?

Variantlar: 4

10

The rate of a chemical reaction increases when the temperature is raised primarily because:

Variantlar: 4

11

For the reaction C(s) + CO₂(g) ⇌ 2CO(g), what happens to the equilibrium if the pressure is increased at a constant temperature?

Variantlar: 4

12

Calculate the standard enthalpy of reaction (ΔH°) for: 2CO(g) + O₂(g) → 2CO₂(g). (ΔH°f for CO = -110.5 kJ/mol; ΔH°f for CO₂ = -393.5 kJ/mol)

Variantlar: 4

13

What is the product when concentrated Nitric acid (HNO₃) reacts with Copper (Cu) metal?

Variantlar: 4

14

Which of the following is an amphoteric oxide?

Variantlar: 4

15

How many structural isomers exist for the hydrocarbon Butane (C₄H₁₀)?

Variantlar: 4

16

What is the functional group present in an ester?

Variantlar: 4

17

Which test can be used to distinguish between Glucose and Sucrose?

Variantlar: 4

18

Complete combustion of 0.44 g of an organic compound produced 0.88 g of CO₂ and 0.36 g of H₂O. What is the empirical formula of the compo...

Variantlar: 4

19

[Olympiad] Calculate the pH of a 0.1 M solution of Cyanic acid (HCN). (Ka = 4.9 × 10⁻¹⁰)

Variantlar: 4

20

[Olympiad] The Ksp of Lead(II) iodide (PbI₂) is 7.1 × 10⁻⁹. What is the molar solubility of PbI₂ in pure water?

Variantlar: 4

21

[Olympiad] For the reaction A + B → C, the rate equation is Rate = k[A]²[B]. If the concentration of A is halved and the concentration of...

Variantlar: 4

22

[Olympiad] Which of the following conditions must be met for a reaction to be spontaneous at all temperatures?

Variantlar: 4

23

[Olympiad] A metal crystallizes in a face-centered cubic (FCC) lattice. What is the packing efficiency of this unit cell?

Variantlar: 4

24

[Olympiad] How many unpaired electrons are present in a high-spin Fe²⁺ ion (Z=26) in an octahedral crystal field?

Variantlar: 4

25

[Olympiad] Which mechanism describes the reaction of 2-bromo-2-methylpropane with aqueous NaOH?

Variantlar: 4

26

Which organelle is responsible for synthesizing proteins within a cell?

Variantlar: 4

27

By which process do mineral ions usually enter a plant root hair cell when the concentration of ions in the soil is lower than inside the...

Variantlar: 4

28

What are the monomers that make up a DNA molecule?

Variantlar: 4

29

At high temperatures, enzymes stop working because they have been:

Variantlar: 4

30

Which of the following is a product of photosynthesis?

Variantlar: 4

31

Which component of the human diet is essential for the prevention of scurvy?

Variantlar: 4

32

In the human heart, which valve prevents blood from flowing back from the aorta into the left ventricle?

Variantlar: 4

33

Which of the following environmental factors increases the rate of transpiration in plants?

Variantlar: 4

34

Antibiotics are effective against which type of pathogen?

Variantlar: 4

35

What is the role of bile in the human digestive system?

Variantlar: 4

36

Which structure in the human respiratory system is kept open by rings of cartilage?

Variantlar: 4

37

Anaerobic respiration in yeast cells produces Carbon dioxide and:

Variantlar: 4

38

What is the primary function of the kidneys?

Variantlar: 4

39

Which hormone is released into the blood during a "fight or flight" situation?

Variantlar: 4

40

A plant with genotype Rr is crossed with another plant of genotype Rr. What is the probability of the offspring having the genotype rr?

Variantlar: 4

41

What defines "sensitivity" as a characteristic of living organisms?

Variantlar: 4

42

Which kingdom do organisms that are multi-cellular, have a nucleus, but NO cell wall belong to?

Variantlar: 4

43

Excessive use of nitrogen-containing fertilizers can lead to which environmental problem?

Variantlar: 4

44

Which of the following is an example of discontinuous variation in humans?

Variantlar: 4

45

In a food web, what is the role of "decomposers"?

Variantlar: 4

46

What happens during the process of "ovulation" in the human menstrual cycle?

Variantlar: 4

47

The transfer of pollen grains from the anther to the stigma is called:

Variantlar: 4

48

Which enzyme is used in the food industry to extract juice from fruit?

Variantlar: 4

49

A group of cells with similar structures working together to perform a shared function is called a/an:

Variantlar: 4

50

Which of the following represents the correct flow of energy in a food chain?

Variantlar: 4

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