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Important questions about Chemistry. Chemistry MCQ questions with answers. Chemistry exam questions and answers for students and interviews.

1. The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is

Options

A : 1.568 x 10 3

B : 6.023 x 10 19

C : 4.84 x 10 17

D : 6.023 x 10 23

2. The gas present in the stratosphere which filters out some of the sun's ultraviolet light and provides an effective shield against radiation damage to living things is

Options

A : helium

B : ozone

C : oxygen

D : methane

3. The nucleus of an atom consists of

Options

A : electrons and neutrons

B : electrons and protons

C : protons and neutrons

D : All of the above

4. The metal that is used as a catalyst in the hydrogenation of oils is

Options

A : Ni

B : Pb

C : Cu

D : Pt

5. The organic reaction represented by equation CH 3 - CH = O + H 2 NOH gives CH 3 - CH - NH + H 2 O is an example of

Options

A : an addition reaction

B : a condensation reaction

C : an oxidation reaction

D : an elimination reaction

6. The mineral containing both magnesium and calcium is

Options

A : magnesite

B : calcite

C : carnallite

D : dolomite

7. The graphite rods in the nuclear reactor

Options

A : react with U to release energy

B : produce neutrons

C : undergo combustion which triggers the nuclear fission

D : convert fast moving neutrons into thermal neutrons

8. The molecules of which gas have highest speed?

Options

A : H 2 at -73 o C

B : CH 4 at 300 K

C : N 2 at 1,027 o C

D : O 2 at 0 o C

9. The number of g-molecule of oxygen in 6.02 x 10 24 CO molecules is

Options

A : 1 gram of molecule

B : 0.5 gram of molecule

C : 5 gram of molecule

D : 10 gram of molecule

10. The main buffer system of the human blood is

Options

A : H 2 CO 3 - HCO 3

B : H 2 CO 3 - CO 3 2-

C : CH 3 COOH - CH 3 COO -

D : NH 2 CONH 2 - NH 2 CONH +

1. The isomerism which exists between CH 3 CHCI 2 and CH 2 CI. CH 2 CI is

Options

A : chain isomerism

B : functional group isomerism

C : positional isomerism

D : metamerism

2. The number of d-electrons in Fe 2+ (Z = 26) is not equal to that of

Options

A : p -electrons in Ne(Z = 10)

B : s -electrons in Mg(Z = 12)

C : d -electrons in Fe(Z = 26)

D : p -electrons in CI(Z = 17)

3. The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is

Options

A : carbon

B : hydrogen

C : oxygen

D : nitrogen

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

Options

A : 0.5 mole

B : 0.2 mole

C : 0.4 mole

D : 0.25 mole

5. The molecule which has the highest percentage of ionic character among the following is

Options

A : HI

B : HF

C : HCI

D : HBr

6. The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth;s early life and solidified into hard rock's called

Options

A : granite

B : basalt

C : igneous rocks

D : sedimentary rocks

7. The metal does not give H 2 on treatment with dilute HCL is

Options

A : Zn

B : Fe

C : Ag

D : Ca

8. The nuclear particles which are assumed to hold the nucleons together are

Options

A : electrons

B : positrons

C : neutrons

D : mesons

9. The iron ore magnetite consists of

Options

A : Fe 2 O 3

B : Fe 3 OH 4

C : FeCO 3

D : 3Fe 2 O 3 .. 3H 2 O

10. The hydronium ion is

Options

A : H +

B : HO -

C : H2 +

D : H 3 O +

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