Chemistry Test 231

Question 1
4 / -1

64g of an organic compound has 24g carbon and 8g hydrogen and the rest is oxygen. The empirical formula of the compound is

A
CH₄O

B
CH₂O

C
C₂H₄O

D
None of these

Question 2
4 / -1

The number of spectral lines observed when an electron falls from n = 5 to n = 1 in the visible region is

A
5

B
3

C
2

D
4

Question 3
4 / -1

Which transition involves the maximum amount of energy?

A
M^-(g) → M(g) + e

B
M^-(g) → M⁺(g) + 2e

C
M⁺(g) → M²⁺(g) + e

D
M²⁺(g) → M³⁺(g) + e

Question 4
4 / -1

Which of the following has the highest dipole moment and which one has the highest m.p. respectively?

A
d and c

B
a and c

C
a and d

D
d and a

Question 5
4 / -1

A diatomic gas will be obtained in which of the following cases:

A
KNO3 + K → (with heat)

B
NH4NO3 → (with heat)

C
Both (a) and (b)

D
None of these

Question 6
4 / -1

Calcium lactate is a salt of a weak organic acid and is represented as Ca(Lac)₂. A saturated solution of Ca(Lac)₂ contains 0.13 mol of this salt in 0.50 litre solution. The pOH of this solution is 5.60. Assuming a complete dissociation of the salt, calculate K_a of lactic acid.

A
8.2 x 10 ^-4

B
9.0 x 10 ^-4

C
6.5 x 10 ^-4

D
4.1 x 10 ^-4

Question 7
4 / -1

X and Y are two elements which form X₂Y₃ and X₃Y₄. If 0.20 mol of X₂Y₃ weighs 32.0 g and 0.4 mol X₃Y₄ weighs 92.8 g, the atomic weights of X and Y are respectively

A
16.0 and 56.0

B
8.0 and 28.0

C
56.0 and 16.0

D
28.0 and 8.0

Question 8
4 / -1

One beaker contains 100 mL of 0.1 M oxalic acid solution and other beaker contains 50 mL of 0.1 M acetic acid solution. Which one of the following statement is correct in this regard ?

A
Both solution have the same pH

B
The pH of oxalic acid solution is double that of acetic acid solution

C
The pH of oxalic acid solution is greater, but not double that of acetic acid solution

D
The pH of the oxalic acid solution is less than that of acetic acid solution

Question 9
4 / -1

An acidic solution contains Cu²⁺, Pb²⁺ and Zn²⁺, If H₂S(g) is passed through this solution , the precipitate will contain

A
CuS and ZnS

B
PbS and ZnS

C
CuS and PbS

D
Cus,Pbs and ZnS.

Question 10

4 / -1

Match list I containing fuels with list II containing their composition. Select the correct answer using the coeds given below

List I (Fuels)		List II (Compostion)
(a)	Water gas	1.	A mixture of CO and N₂
(b)	Producer gas	2.	Methane
(c)	Coal gas	3.	Equimolecular mixture of CO and H₂
(d)	Natural gas	4.	A mixture of CO, H₂, CH₄ and CO₂

Chemistry Test ...

Question 1

CH4O

CH2O

C2H4O

None of these

Question 2

5

3

2

4

Question 3

M-(g) → M(g) + e

M-(g) → M+(g) + 2e

M+(g) → M2+(g) + e

M2+(g) → M3+(g) + e

Question 4

d and c

a and c

a and d

d and a

Question 5

KNO3 + K → (with heat)

NH4NO3 → (with heat)

Both (a) and (b)

None of these

Question 6

8.2 x 10 -4

9.0 x 10 -4

6.5 x 10 -4

4.1 x 10 -4

Question 7

16.0 and 56.0

8.0 and 28.0

56.0 and 16.0

28.0 and 8.0

Question 8

Both solution have the same pH

The pH of oxalic acid solution is double that of acetic acid solution

The pH of oxalic acid solution is greater, but not double that of acetic acid solution

The pH of the oxalic acid solution is less than that of acetic acid solution

Question 9

CuS and ZnS

PbS and ZnS

CuS and PbS

Cus,Pbs and ZnS.

Question 10

a - 3, b - 1, c - 4, d - 2

a - 3, b - 1, c - 2, d - 4

a - 1, b - 3, c - 4, d - 2

None of these

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CH₄O

CH₂O

C₂H₄O

M^-(g) → M(g) + e

M^-(g) → M⁺(g) + 2e

M⁺(g) → M²⁺(g) + e

M²⁺(g) → M³⁺(g) + e

8.2 x 10 ^-4

9.0 x 10 ^-4

6.5 x 10 ^-4

4.1 x 10 ^-4