Chemistry Exam

Lodine can be separated from a mixture of Iodine and Potassium Chloride by ?

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Filtration
Sublimation
Distillation
Sedimentation

What is the degeneracy of the rotational energy level with J = 4 for a heteronuclear diatomic molecule?

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1
2
4
9

Consider the following statements and select the correct code. Assertion (A): A chemical reaction becomes faster at higher temperature. Reason (R): At higher temperature, molecular motion becomes more rapid.

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Both A and R are true and R is the correct explanation of A
Both A and R are true, but R is not correct explanation of A
A is true, but R is false
A is false, but R is true

The National Chemical Laboratory is situated in:

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New Delhi
Bangalore
Pune
Patna

A nuclear magnetic resonance transition is shifted from the reference in a 400 MHz NMR spectrometer by 529 Hz. Calculate the chemical shift.

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5.29
1.32
7.56
1.76

What is the maximum number of electrons the second energy level can hold?

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6
8
4
2

The term anomers of glucose refers to:

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Isomers of glucose that differ in configurations at carbons one and four (C-1 and C-4)
A mixture of (D)-glucose and (L)-glucose
Enantiomers of glucose
Isomers of glucose that differ in configuration at carbon one (C-1)

Which one of the following gas is readily soluble in water at room temperature ?

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Chlorine
Nitrogen
Ammonia
Carbon dioxide

“Atoms can neither be created nor destroyed.” This principle was given by ____________?

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Avogadro
Dalton
Rutherford
Niels Bohr

In the process of electroplating a utensil with zinc:

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The utensil is made the cathode
Pure zinc is made the anode
The utensil is made the cathode and pure zinc is made the anode
The utensil is made the anode and pure zinc is made the cathode

The inherited traits of an organism are controlled by:

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RNA molecules
nucleotides
DNA molecules
Enzymes

The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively, which of the following statements is NOT correct?

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Magnesium chloride solution coagulates, the gold sol more readily than the iron (III) hydroxide sol
Sodium sulphate solution causes coagulation in both sols
Mixing the sols has no effect
Coagulation in both sols can be brought about by electrophoresis

What does Nucleus consist of?

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Protons and Neutrons
Protons and Electrons
Neutrons
Protons

Unreactive non metals are called. ____________ .

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Alkanes
Alkali metals
Polymers
Noble gases

Zone refining is used for the purification of:

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Au
Ge
Ag
Cu

Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is:

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R4Si
R4Si
R2SiCl2
R3SiCl

How many nearest neighbours are there for an atom in a hexagonal close-packed crystal structure?

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6
12
18
24

Consider the following statements : In 90 2 38 Sr : (i) atomic number is 36 (ii) number of electrons is 38 (iii) number of neutrons is 52 (iv) number of protons is 38 Which of these are correct ?

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(i) and (ii)
(ii) and (iii)
(iii) and (iv)
(i) and (iv)

What do non metal atoms lose to form negatively charged ions?

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Protons
Neutrons
Electrons
Protons and Neutrons

What are the number of moles of CO2 which contains 16 g of oxygen?

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0.5 mole
0.2 mole
0.4 mole
0.25 mole

Atomic number is equal to :

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Number of electrons
Number of nutron
Number of protons
Total number of protons and neutrons

The mass number of a nucleus is:

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Always less than its atomic number
The sum of the number of protons and neutrons present in the nucleus
Always more than the atomic weight
A fraction

The isotope atoms differ in ?

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Number of neutrons
Atomic number
Number of electrons
Atomic weight

The main active constituent of tea and coffee is:

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Nicotine
Chlorophyll
Caffeine
Aspirin

One of the essential minerals in the human body is salt. How much salt (NaCl) is in the average adult human body?

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1 kilogram
500 grams
250 grams
Practically none

Consider the following statements: Assertion (A): LPG is a pollution free vehicular fuel. Reason (R): Plying of CNG fuelled-buses is recommended for metropolitan cities in India.

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Both A and R are true, and R is the correct explanation of A
Both A and R are true, but R is not the correct explanation of A
A is true, but R is false
A is false, but R is true

Living in the atmosphere of CO is dangerous because it:

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Reduces organic matter of tissues
Dries up the blood
Combined with O2 present inside to form CO2
Combines with haemoglobin and makes it incapable of absorbing oxygen

Which of the following is a polyamide?

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Teflon
Nylon – 66
Terylene
Bakelite

The mineral containing both magnesium and calcium is:

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Magnesite
Calcite
Carnallite
Dolomite

What is atomic number of an atom?

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Number of protons
Number of neutrons
Number of electrons
Total number of protons and neutrons

Chemistry Exam : Question 1 of 30