Chemistry Questions Sep-2023
1.Which one of the following fuels causes minimum environmental pollution?
(A) Diesel (B) Coal
(C) Gasoline (D) Hydrogen
2.Born-Haber cycle is used to determine-
(A) Electro negativity (B) Lattice energy
(C) Both (D) None
3.The first element of rare earth metal is-
(A) Cerium (B) Actinium
(C) Uranium (D) Lanthanum
4.The mass of 6.02 X 1023 molecules of CO2 is-
(A) 28g (B) 44g
(C) 7.0g (D) 56g
5.Which of the following gases will have the highest rate of diffusion?
(A) O2 (B) CO2
(C) NH3 (D) N2
6.The nucleus of an atom consists of-
(A) Electrons and neutrons
(B) Electrons and protons
(C) Protons and neutrons
(D) All of the above
7.The Potassium graphite and Calcium Graphite can be mostly used as which among the following?
(A) Moderators (B) Semiconductors
(C) Superconductors (D) Lubricants
8. The number of moles of solute present in 1 kg of
a solvent is called its
(A) Molality (B) Molarity
(C) Normality (D) Formality
9.The most electronegative element among the following is.
(A) Sodium (B) Bromine
(C) Fluorine (D) Oxygen
10. Which method is used in general to obtain metal from its sulphide ore?
(A) Reduction (B) Roasting
(C) Calcination (D) Electrolysis
11.The most commonly used bleaching agent is
(A) Alcohol (B) Carbon dioxide
(C) Chlorine (D) Sodium chlorine
12.The monomer of polythene is-
(A) Vinyl chloride (B) Ethylene
(C) Ethyl alcohol (D) None of these
13.The luster of a metal is due to_________.
(A) Its High density
(B) Its High polishing
(C) Its chemical inertness
(D) Presence of free electrons
14.The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is __.
(A) 1.568 x 103 (B) 6.023 x 1019
(C) 4.84 \x 1017 (D) 6.023 x 1023
15.“Oil of mirbane” is the most common name of which among the following?
(A) Phenol (B) Toluene
(C) Phenolphthalein (D) Nitrobenzene
16.The oil used in the froth floatation process is
(A) Coconut oil (B) Olive oil
(C) Kerosene oil (D) Pine oil
17. The material which can be deformed permanently by heat and pressure is called a
(A) Thermoplastic (B) Thermoset
(C) Chemical compound (D) Polymer
18.The gas used in the manufacture of vanaspati from vegetable oil is-
(A) Hydrogen (B) Oxygen
(C) Nitrogen (D) Carbon dioxide
19. The ionic radii of N3-, O2-, F- and Na+ follows the order
(A) N3
- > O2
- > F- > Na+
(B) N3- > Na+ > O2- > F-
(C) Na+ > O2- > N3- > F-
(D) O2- > F- > Na+ > N3-
20.Which of these is a hydronium ion?
(A) H+ (B) HO –
(C) H2+ (D) H3O+
21.Which of the following statements is true?
I. Greenhouse gases trap heat in the atmosphere
which makes the Earth warmer, causing global
warming.
II. Co2, colorless odorless gas that occurs
abundantly in nature.
Select the correct option.
(A) Only I (B) Only II
(C) Both I & II (D) Neither I nor II
22.Which of the following statements is true?
I. Evaporation a substance from the solid to the
gaseous.
II. The process of change from liquid to gas is
called Vaporization.
Select the correct option.
(A) Only I (B) Only II
(C) Both I & II (D) Neither I nor II
23.Which of the following statements is true?
I. Oxidation is the loss of electrons
II. Nitrogen dioxide (NO2) is a reddish-brown
pungent gas.
Select the correct option.
(A) Only I (B) Only II
(C) Both I & II (D) Neither I nor II
24.Which of the following statements is true?
I. An exothermic reaction is a chemical reaction
that releases energy through light or heat.
II. Fermentation, chemical process by which
molecules such as glucose
Select the correct option.
(A) Only I (B) Only II
(C) Both I & II (D) Neither I nor II
25.Which of the following statements is true?
I. Yeast, any of about 1,500 species of singlecelled fungi.
II. Chlorofluorocarbons (CFCs) are nontoxic,
nonflammable chemicals containing atoms.
Select the correct option.
(A) Only I (B) Only II
(C) Both I & II (D) Neither I nor II
Answer: 1-(D) 2-(B) 3-(A) 4-(B) 5-(C) 6-(C) 7-(C) 8-(B) 9-(C) 10-(A) 11-(C) 12-(B) 13-(D) 14-(B) 15-(D) 16-(D) 17-(B) 18-(A) 19-(A) 20-(D) 21-(A) 22-(B) 23-(C) 24-(C) 25-(C)
