Solved Chemistry MCQS Set 3

Atmosphere of big/metropolitan cities is polluted most by

Radio-active fall out

Household waste

Pesticide residue

Automobile exhausts

The freezing point of 1 molal NaCl solution assuming NaCl to be 100% dissociated in water in

1.86

-3.72

3.72

-1.86

Formic acid is obtained when

Calcium formate is heated with calcium acetate

Calcium acetate is heated with conc. H₂SO₄

Acetaldehyde is oxidized with K2Cr₂O₇ and H₂SO₄

Glycerol is heated with oxalic acid

What happens when CCl₄is treated with AgNO₃solution?

Nothing will happen

NO₂will be evolved

CCl₄will dissolve in AgNO₃solution

A white ppt. of AgCl will form

Which is true for an element R present in group 13 of the periodic table?

It forms R₂O₃

It is a gas at room temperature

It has oxidation state of +4

It forms RX₂

Number of elements present in the fifth period of periodic table is

32

8

18

10

Which of the following as a molecular diseaes?

Cancer

Sickle cell anemia

Allergy

German measles

A current of 9.65 ampere flowing ofr 10 minutes deposits 3.0 g of the metal which is monovalent. The atomic mass of the metal is

96.5

30

50

10

The addition of HBr is easiest with

CICH = CHCl

(CH3)2 C = CH2

CH2 = CHCl

CH3 – CH = CH2

Which one is the property of an ideal solvent?

Should be safe to use

Should be expensive

It should react chemically with the solute

Impurities should crystallize along with the solute