Chemistry MCQ 1 | Questions Answers

Chemistry Quiz 1, online questions and answers to grow the knowledge of chemistry for different types of school college competitive examinations. The Quiz set contains 10 multiple choice questions (MCQ) from different topics of chemistry for all competitive exams.

Among the following, the species with identical chemical bond order

CO and O₂⁻²

O₂⁻ and CO

O₂⁻² and B₂

CO and N₂⁺

The role of hemoglobin is to

Store oxygen in muscles

Transport oxygen to different part of body

Convert CO to CO₂

Convert carbon-dioxide to carbonic acid

The paper soaked in salt X turns brown when exposed to HNO₃ vapor, the salt X is

KCl

KBr

KI

K₂SO₄

The formal oxidation number of Cr and Cl in the ions Cr2O7-2 and ClO3- are

+6 and +7

+7 and +5

+6 and +5

+8 and +7

The hybridization of xenon atom in XeF₄

SP³

dsp²

sp³d²

d²sp³

The correct order of energy of 2S orbitals in H, Li, Na and K

K < Na < Li < H

Na < Li < K < H

Na < K < H < Li

H < Na < Li < K

A container of volume 2.24 lit can stand with a maximum pressure of 2 atm at 298K before exploding. The maximum amount of nitrogen that can be safely put to the container at this temperature closet to

2.8 gm

5.6 gm

1.4 gm

4.2 gm

Among the following, the correct statement

No two electrons in an atom can have the same set of four quantum numbers

The maximum number of electrons in the shell with the principal quantum number, n equal to n2 +2

Electrons in an orbital must have opposite spin

In the ground state, atomic orbitals filled in the order of their increasing energies

The solubility of BasO₄ in pure water is closest to
[Given K_SP = 1.0 × 10^-10 at 25⁰C and molecular weight = 233 gm mol^-1]

1.0 × 10⁻⁵

1.0 × 10⁻³

2.3 × 10⁻⁵

2.3 × 10⁻³

Among the following, the correct statement is

pH decreases when solid ammonium chloride added to a dilute aqueous solution of NH3.

pH decreases when solid ammonium acetate added to a dilute aqueous solution of acetic acid.

When solid NaCl added to a dilute aqueous solution of NaOH pH decrease.

pH decreases when solid sodium oxalate added to a dilute aqueous solution of oxalic acid.

The number of water molecules in 250 ml of water solution closest to
[Given the density of water 1.0 gm ml^-1; Avogadro number = 6.023 × 10²³]

83.6 × 10²³

13.9 × 10²³

1.5 × 10²³

33.6 × 10²³

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