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Chemistry 1488 MCQs [All-Courses]

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oost your exam preparation with our Chemistry MCQs designed for PPSC, FPSC, NTS, OTS, PTS, AJKPSC, BPSC, KPPSC, PMS, CSS, and all competitive exams.
Our content covers Basic Chemistry, Atomic Structure, Periodic Table, Chemical Reactions, Acids & Bases, Organic Chemistry, and everyday chemical concepts.

All Topics  1488

1 a.m.u =__________________?
A 1.6 x 10-27 kg
B 1.6 x 10-24 kg
C 1.6 x 10-26 kg
D 1.6 x 10-28 kg
Correct Answer: 1.6 x 10-27 kg
The properties of an element mosly corresponds to that isotope which has greater_________________?
A Mass number
B Atomic mass
C Relative abundance
D all of the above
Correct Answer: Relative abundance
For which of the following compounds the term empirical formula cannot be applied ?
A NaCl
B H2O
C CCI4
D It can be applied to all mentioned above
Correct Answer: It can be applied to all mentioned above
When cationic molecular ions are allowed to pass through strong magnetic field in mass spectrometer which of the following ions is fallen__________________?
A lighter
B intermediate
C heavier
D are collected at same time
Correct Answer: lighter
Isotopes of the same elements has__________________?
A different number of protons
B same number of neutrons
C different number of neutrons
D same mass number (nucleon number)
Correct Answer: different number of neutrons
Which of the following is not a macromolecule ?
A sand
B haemoglobin
C diamond
D maltose
Correct Answer: maltose
Mostly elements have fractional atomic masses because of______________________?
A Mass of an atom itself is in fraction
B Atomic masses are average masses of isobars
C Atmoic masses are average masses of isotopes proportional to their relative abundance
D Atmoic masses are average masses of isotopes
Correct Answer: Atmoic masses are average masses of isotopes proportional to their relative abundance
Percentage of calcium in calcium carbonate is___________________?
A 80%
B 30%
C 40%
D 20%
Correct Answer: 40%
For the measurement of standard electrode potential Zn is dipped in________________?
A 1 M ZnO solution
B 1 M ZnSO4 solution
C 1.5 M ZnSO4 solution
D 0.1 M ZnSO4 solution
Correct Answer: 1 M ZnSO4 solution
The correct electronic configuration of Cu is ___________________?
A [Ar]4s1
B [Ar]4s2
C [Ar]3d104s1
D [Ar]3d94s2
Correct Answer: [Ar]3d104s1
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