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Quiz 20
Mdcat-past-papers - SZABMU Quiz
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Board: SZABMU |
381. The oxidation number of oxygen in Na₂O₂ is:
-1
2
-2
1
382. The oxidation number of oxygen in NaO₂ is:
-1
2
-2
1
383. During electrolysis of concentrated aqueous solution of NaCl, which ion is NOT discharged at cathode?
Na⁺
Cl⁻
H⁺
OH⁻
384. Which statement correctly describes the standard electrode potential?
It is the electrode potential determined at room temperature and pressure
It is the electrode potential determined under standard conditions using standard hydrogen electrode as the other electrode
It is the electrode potential of an element and its solution compared to a standard value
It is the potential which is measured when two half cells are connected together
385. The unit of rate constant is the same as that of the rate of reaction in which of the following order of reaction?
Zero
First
Second
Third
386. If a reaction is first order with respect to a reactant, then the rate will be ___ if concentration of reactant is doubled:
Doubled
Halved
One fourth
Quadrupled
387. The rate constant 'k' in the rate equation is the rate of reaction when molar concentration of each of the reactant is:
1 M
2 M
3 M
4 M
388. The rate of reaction:
Increases as the reaction proceeds
Decreases as the reaction proceeds
Remains the same as the reaction proceeds
Remains the same initially & then increases
389. The study of rates of chemical reactions is known as:
Thermodynamics
Stoichiometry
Electrochemistry
Chemical kinetics
390. Decomposition of ammonia on heated tungsten is an example of:
Pseudo first order reaction
First order reaction
Second order reaction
Zero order reaction
391. What is incorrect about activated complex?
It is a high energy specie
It is a stable specie
It is an unstable specie
Potential energy is maximum at activated complex stage
392. Which of the following has the smallest size?
Mg
S
P
Na
393. Which element has smaller shielding effect among the following?
Mg
Ca
Rb
Sr
394. Which of the following alkali metals can form normal oxide as well as peroxide?
Na
K
Li
Cs
395. The transition element which doesn't show variable valency:
Zn
Cu
Fe
Co
396. The binding energy of transition metals increases up to group:
IIB
IVB
IIIB
VIB
397. Which of the following have positive electron affinity?
Addition of electron to Cl
Addition of electron to O
Addition of electron to O⁻¹
Addition of electron to N
398. The melting point of sulphur is higher than that of phosphorus because:
Sulphur has strong van der Waals forces
Sulphur has weak van der Waals forces
Phosphorus has strong van der Waals forces
Phosphorus has weak van der Waals forces
399. Which one of the following noble gases will have highest boiling point?
Kr
Ar
Ne
He
400. A metal reacts vigorously with cold water melting into a ball of molten metal. It moves across the surface of water giving off hydrogen gas and burns with yellowish golden flame. What could be the identity of this metal?
Potassium
Sodium
Lithium
Calcium
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