1- On hydrogen atom spectrum, series of ______ within visible region, is:
A. Lyman series
B. Balmer series
C. Paschen series
D. Bracket series
View Answer
Answer : B. Balmer series
Description
2- s-sp³ overlap occurs in ______ molecules:
A. Cl₂
B. CH₄
C. HF
D. HI
View Answer
Answer : B. CH₄
Description
3- ΔH = ΔE + PΔV is the change in enthalpy at constant ______.
A. Volume
B. Pressure
C. Temperature
D. Mass
View Answer
Answer : B. Pressure
Description
4- As the concentration of reactant increases, the rate of reaction also increases, it is because:
A. Oscillation increases between molecules
B. K.e. increase in molecules
C. Collisions frequency increases
D. None of these
View Answer
Answer : C. Collisions frequency increases
Description
5- The equation shows the reaction between elements X and dilute hydrochloric acid.
What types of bonding are present in element X and in compound XCl₂?
X(s)+ 2HCl(aq) → XCl₂(aq) + H₂(g)
Type of bonding In element X In compound XCl₂
A Covalent Covalent
B Covalent Ionic
C Metallic Covalent
D Metallic Ionic
A. Covalent covalent
B. Covalent ionic
C. Metallic covalent
D. Metallic ionic
View Answer
Answer : D. Metallic ionic
Description
6- If the value of Kc is very large then it shows that ______ completed.
A. Forward reaction
B. Reverse reaction
C. Equilibrium is maintained
D. Kc is moderate
View Answer
Answer : A. Forward reaction
Description
7- For stable molecular geometry, each carbon atom of undergoes:
A. Sp² hybridization
B. Sp³ hybridization
C. Dsp² hybridization
D. D²sp² hybridization
View Answer
Answer : B. Sp³ hybridization
Description
8- If the absolute temperature of a gas is reduced to one half and the pressure is doubled, the volume of gas will be:
A. Increased four times
B. Decreased four times
C. Remained unchanged
D. Reduced to one half
View Answer
Answer : B. Decreased four times
Description
9- Change in extensive property is proportional to the change in ______ of material.
A. Temperature
B. Volume
C. Quantity
D. Pressure
View Answer
Answer : C. Quantity
Description
10- Which of the following has the highest electrical conductivity?
A. Aqueous sugar solution
B. Solid graphite
C. Solid sodium chloride
D. Gaseous carbon dioxide
View Answer
Answer : B. Solid graphite
Description
11- The oxidation number of nitrogen in the HNO₃ is ______.
A. 4+
B. 5+
C. 6+
D. 7+
View Answer
Answer : B. 5+
Description
12- X is a salt that decomposed in water What is the reason for decomposition?
A. This potential oxidizes salt
B. This potential reduces salt
C. This potential reduces water
D. This potential oxidizes water
View Answer
Answer : D. This potential oxidizes water
Description
13- In acidic medium, oxidation action of potassium permanganate depends upon:
A. Mn²⁺
B. KMn³⁺
C. MnO₃
D. Mn⁴⁺
View Answer
Answer : A. Mn²⁺
Description
14- The energy required to remove the outermost electron from gaseous atom is called:
A. Electronegativity
B. Electropositivity
C. Ionization potential
D. Electron affinity
View Answer
Answer : C. Ionization potential
Description
15- Which sequence of reaction conditions should be used to produce the compound below from benzene?
A. AlCl₃/Cl₂, H₂/Rh/C
B. Cl₂/ UV light, H₂ / Rh / C
C. H₂ / Rh / C; AlCl₃ / Cl₂
D. HCl ; H₂ / Rh / C
View Answer
Answer : A. AlCl₃/Cl₂, H₂/Rh/C
Description
16- Cyanohydrins can be synthesized from ketones through:
A. Nucleophilic addition reaction
B. Uni-molecular nucleophilic substitution reaction
C. Electrophilic substitution reaction
D. Bimolecular nucleophilic substitution reaction
View Answer
Answer : A. Nucleophilic addition reaction
Description
17- Which of the following elements does not belong to elements?
A. Uranium
B. Samarium
C. Thorium
D. Osmium
View Answer
Answer : D. Osmium
Description
18- Gasoline is a mixture of hexane and ______.
A. Methane
B. Butane
C. Decane
D. Heptanes
View Answer
Answer : D. Heptanes
Description
19- What is the name of the following compound?
A. 1-ethyl-3, 4-dimethylcycloheptane
B. 2-ethyl-4, 5-dimethylcyclohexane
C. 1-ethyl-3, 4- dimethylcyclohexane
D. 4-ethyl-1, 2- dimethylcyclohexane
View Answer
Answer : C. 1-ethyl-3, 4- dimethylcyclohexane
Description
20- Bakelite is a polymer of formaldehyde and ______.
