Chemistry

1. Which one of the following is the correct decreasing order of boiling point?

H₂Te > H₂O > H₂Se > H₂S

H₂O > H₂S > H₂Se > H₂Te

H₂Te > H₂Se > H₂S > H₂O

H₂O > H₂Te > H₂Se > H₂S

Question 1 of 15

2. Sulphur reacts with chlorine in 1 : 2 ratio and forms X. Hydrolysis of X gives a sulphur compound Y. What is the structure and hybridisation of anion of Y?

Pyramidal, sp³

Trigonal planar, sp²

Linear, sp

Tetrahedral, sp³

Question 2 of 15

3. The paramagnetic species is:

KO₂

SiO₂

BaO₂

TiO₂

Question 3 of 15

4. In the nitrogen family the H – M – H bond angle in the hydrides MH₃ gradually becomes closer to 90° on going from N to Sb. This shows that gradually –

Almost pure p-orbitals are used for M – H bonding

The bond energies of M – H bond increases

The basic strength of hydrides increases

The bond pairs of electrons becomes nearer

Question 4 of 15

5. Which of the following compound is a tribasic acid?

H₃PO₄

H₄P₂O₇

H₃PO₂

H₃PO₃

Question 5 of 15

6. Arsenicals are mainly used for treatment of:

Syphilis

Typhoid

Cholera

Jaundice

Question 6 of 15

7. Which of the following oxides is most acidic?

N₂O₅

Ag₂O

V₂O₅

Question 7 of 15

8. Which gas cannot be collected over water?

PH₃

O₂

SO₂

N₂

Question 8 of 15

9. The tribasic acid is:

H₃PO₃

HPO₃

H₃PO₂

H₃PO₄

Question 9 of 15

10. Choose the correct statement –

White or yellow phosphorus is stored under water

Black phosphorus is non crystalline

Ignition temperature of red phosphorus is low

Phosphorus does not form hydrides

Question 10 of 15

11. Nitrolium is:

CaCN₂+C

Ca(NO₃)₂

Ca(CN)₂

CaCN₂

Question 11 of 15

12. The mixture of concentrated HCI and HNO₃ made in 3 : 1 ratio contains:

NCl₃

N₂O₄

NOCl

ClO₂

Question 12 of 15

13. The laughing gas is:

N₂O

N₂O₄

N₂O₅

Question 13 of 15

14. Iodide of Millon’s base is:

Hg(NH₂)I

HIO₃

K₂HgI₄

NH₂HgO.HgI

Question 14 of 15

15. The incorrect statement among the following is:

C₆₀ is an allotropic form of carbon

Red phosphorus is more stable in air than white phosphorus

O₃ is an allotropic form of oxygen

S₈ is the only allotropic form of sulpur.

Question 15 of 15

Test Name	S-Block Elements Test
Subject	Chemistry
Test Type	MCQs
Total Question	15
Total Marks	30
Total Time	15 Mints
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