Chemistry Test 182

Result

Chemistry Test 182

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Weekly Quiz Competition

Question 1
4 / -1

In a closed insulated container, a liquid is stirred with a paddle to increase the temperature, which of the following is true?

A
E =W 0,q = 0

B
E = W= q 0

C
E = 0, W= q 0

D
W = 0, E = q 0

Solution

Internal energy is dependent upon temperature and according to first law of thermodynamics total energy of an isolated system remains same, i.e., in a system of constant mass, energy can neither be created not destroyed by any physical or chemical change but can be transformed from one from to another For closed insultated container, q = 0, so, E = +W, as work is done by the system
Question 2
4 / -1

At 100°C the Kw of water is 55 times its value at 25°C. What will be the pH of neutral solution? (log 55 = 1.74)

A
6.13

B
7.00

C
7.87

D
5.13

Solution
Question 3
4 / -1

Which of the following is a redox reaction?

A

B

C

D

Solution
Question 4
4 / -1

Which statement is correct for hydrogen?

A
It has a very high ionisation potential

B
It is always collected at cathode

C
It can exists both in +1 as well as –1 oxidation state

D
It has same electronegativity as halogens

Solution

The correct option is (c). In H2O, hydrogen has +1 oxidation no. In CaH2, hydrogen has 1 oxidation no.
Question 5
4 / -1

Which of the following represents a correct sequence of reducing power of the following elements?

A
Li > Cs > Rb

B
Rb > Cs > Li

C
Cs > Li > Rb

D
Li > Rb > Cs

Solution
Question 6
4 / -1

Which of the following statements about anhydrous aluminium chloride is correct?

A
It exists as AlCl₃ molecules

B
It is not easily hydrolysed

C
It sublimes at 180ºC

D
It is a strong Lewis base

Solution
Question 7
4 / -1

The IUPAC name of

A
1-hydroxy-4-methyl-3-pentanone

B
2-methyl-5-hydroxy-3-pentanone

C
4-methyl-3-oxo-1-pentanol

D
Hexanol-1-one-3

Solution
Question 8
4 / -1

Ethyl hydrogen sulphate is obtained by reaction of H₂SO₄ on

A
Ethylene

B
Ethane

C
Ethyl chloride

D
Ethanol

Solution
Question 9
4 / -1

Green-house gases

A
allow shorter wavelength to enter earth's atmosphere while doesn't allow longer wavelength to leave the earth's atmosphere.

B
allow longer wavelength to enter earth atmosphere while doesn't allow shorter wavelength to leave the surface

C
don't have wavelength specific character.

D
show wavelength specific behaviour near the earth while far from earth these have wavelength independent behaviour

Solution

Radiation coming from sun or outerspace have high energy or short wavelength, which are allowed to enter by green house gases. However, radiation emitted by earth is in infrared region, having long wavelength, are reflected back by the envelope of green house gases.
Question 10
4 / -1

A
primitive

B
face centered

C
body centered

D
end centered

Solution