Chemistry S-Block Elements Online Mcqs Test

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Question 1

1. Which of the following is most abundant in the earth’s crust?

Question 2

2. Metallic luster exhibited by Na can be explained by

Answer

Existence of body centered cubic lattice

Answer

Excitation of free protons

Answer

Diffusion of sodium ions

Answer

Oscillation of loose electrons

Question 3

3. Red lead is

Question 4

4. Which of the following is not a use of silicon?

Answer

Lubricants

Answer

Antifreeze

Answer

Hydraulic brakes

Answer

Water repellent

Question 5

5. The solubility of aluminum hydroxide in sodium hydroxide solution is due to formation of

Answer

Sodium aluminum hydroxide

Answer

Sodium aluminum hydride

Answer

Aluminum peroxide

Answer

Sodium meta aluminate

Question 6

6. Silicon is found in nature in the form of

Answer

Silica or siticates

Answer

Only silicates

Question 7

7. Which of the following is a Lewis acid?

Question 8

8. Dolomite has the composition

Answer

CaCl₂.MgCl₂.6H₂O

Answer

Na₃AIF₆

Answer

KCL.MgCL₂.6H₂O

Answer

CaCO₃.MgCO₃

Question 9

9. The halide which is not hydrolyzed is

Question 10

10. Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When carbon dioxide is bubbled through A, it turns cloudy. What is the chemical formula of A?

Answer

Ca(HCO₃)₂

Question 11

11. In the manufacture of cement which of the following is used?

Answer

Lime stone and clay

Answer

Lime stone and silica

Answer

Clay and silica

Answer

Lime stone and gypsum

Question 12

12. The formula of sodium meta borate is

Answer

Na₃BO₃

Answer

Na₂B₄O₇

Question 13

13. Which one of the following sulphate is not soluble in water?

Answer

Barium sulphate

Answer

Potassium sulphate

Answer

Zinc sulphate

Answer

Sodium sulphate

Question 14

14. Choose the compound which decomposes on heating similar to LiNO₃

Answer

Be(NO₃)₂

Answer

Sr(NO₃)₂

Answer

Mg(NO₃)₂

Question 15

15. Which element is used in thermite process due to its reactivity?

Question 16

16. Keeping in view the comparison of alkali metals with alkaline earth metals, the alkali metals have

Answer

High melting point

Answer

Smaller ionic radii

Answer

Greater hardness

Answer

Lower ionization energy

Question 17

17. Anodizing of Al is said when

Answer

Aluminum allay containing 95% Al

Answer

Aluminum prepared electrolytically

Answer

Aluminum coated electrically with aluminum oxide

Answer

Aluminum obtained at anode

Question 18

18. The purification method of bauxite containing iron oxide as impurity is known as

Answer

Serpeck’s process

Answer

Baeyer’s process

Answer

Hoop’s process

Answer

Electrolytic process

Question 19

19. Down’s cell is used to prepare

Answer

Sodium carbonate

Answer

Sodium bicarbonate

Answer

Sodium hydroxide

Answer

Sodium metal

Question 20

20. The oxides of beryllium are

Answer

Amphoteric

Answer

None of these

Question 21

21. NaNO₃ decomposes on heating at high temperature to give

Question 22

22. The process of aluminum extraction is called

Answer

Hall process

Answer

Termite process

Answer

Contact process

Answer

Haber process

Question 23

23. The elements which belong to group IIIA are called

Answer

D – block

Answer

F – block

Answer

S – block

Answer

P – block

Question 24

24. Sodium reacts with water more vigorously than lithium because

Answer

It is more electropositive

Answer

It is more electronegative

Answer

It has higher atomic weight

Answer

It is a metal

Question 25

25. Main process for the manufacture of Na₃CO₃ is

Answer

Nelson process

Answer

Castner process

Answer

Down process

Answer

Solvay process

Question 26

26. Graphite is a good conductor of electricity. The reason is that

Answer

Carbon atoms have covalent bonds

Answer

Carbon atoms of each plane have sp²

Answer

There are Van der wall’s forces of attraction between the planes of c atoms

Answer

It has delocalized mobile electron

Question 27

27. Which one of the following gives white precipitate with aqueous BaCl₂?

Answer

Na₂co₃

Question 28

28. Which halide has highest melting point?

Question 29

29. Choose the gas among the following which turns line water milky:

Question 30

30. Alum is not used

Answer

In purification of water

Answer

In tanning of leather

Answer

As a mordant is dyeing

Answer

As an insecticide

Question 31

31. The substance used as a smoke screen in warfare is

Question 32

32. Boric acid cannot be used

Answer

An antiseptic medicine

Answer

For washing of eyes

Answer

For enamels and glazes

Answer

In soda bottles

Question 33

33. BF₃ acts as acid according to the concept of

Question 34

34. A combustible gas is liberated when caustic soda solution is heated with

Question 35

35. Which one of the following has the lowest boiling point?

Question 36

36. Setting of Plaster of Paris involves

Answer

Combination with atmospheric CO₂

Answer

Hydration to yield another hydrate

Answer

Oxidation with atmospheric oxygen

Answer

Dehydration

Question 37

37. Which of the following is a component of ruby?

Question 38

38. The element having least value of ionization energy among the following elements is

Question 39

39. Which is the formula of Chili Salt Peter?

Answer

Na₂So₄

Question 40

40. A pseudo solid is

Question 41

41. Which of the following statements is not true about potash alum?

Answer

Its empirical formula is KAl(SO₄). 12H₂O

Answer

It is used in dyeing industry

Answer

Its aqueous sol. Is basic in nature

Answer

On heating it melts in its water of crystallization

Question 42

42. The formula of calcium cyanamide is

Question 43

43. Among the following oxides, the one which is most basic is

Answer

Aluminum oxide

Answer

Magnesium oxide

Answer

Zinc oxide

Answer

Nitrogen pent oxide

Question 44

44. When excess of SnCl₂ is added to a solution of HgCl₂, a white precipitate turning to grey is obtained. This grey colour is due to the formation of

Answer

Hg₂Cl₂

Question 45

45. Plaster of Paris hardens by

Answer

Combining with water

Answer

Giving off CO₂

Answer

Changing into CaCO₃

Answer

Giving out water

Question 46

46. CO2 is gas while SiO2 is solid at room temperature.

Answer

CO2 is an independent molecule while SiO2 has network covalent structure

Answer

Carbon is non-metal while silicon is semi-metal

Answer

CO2 forms multiple bond while silicon does not form multiple bonds

Answer

Silicon has all sigma bonds

Question 47

47. Which of the following in rain water is responsible for weathering of rocks?

Answer

Noble gases

Question 48

48. Because of its ability to combine with both oxygen and nitrogen aluminum metal is used

Answer

As nitro meter

Answer

To produce alloy

Answer

As insulator

Answer

To remove air bubbles from molten metal

Question 49

49. Choose the correct statement

Answer

Diamond is the hardest and coke is the softest

Answer

Coal is the hardest and coke is the softest

Answer

Graphite is the hardest which lamp black is the softest

Answer

Diamond is the hardest and graphite is the softest

Question 50

50. Aluminum can jam radar due to

Answer

It is a conductor of electricity

Answer

It is a good reflector of radiant energy

Answer

It is a conductor of heat

Answer

It is not true

Question 51

51. Which one is not an element of III A group?

Question 52

52. Magnesium keeps on burning in

Answer

N₂ as well as CO₂

Question 53

53. Cesium oxide will be

Answer

Amphoteric

Answer

Very strongly basic

Answer

Weakly basic

Question 54

54. The chloride of an element A gives a neutral solution in water. In the periodic table, the element A belongs to

Answer

First group

Answer

Fifth group

Answer

Third group

Answer

First transition series

Question 55

55. Ordinary window glass is a mixture of

Answer

Na₂CiO₃ and CO₂

Answer

Na₂SiO₃ and SiO₂

Answer

Na₂O and SiO₂

Answer

Na₂SiO₃ and CaSiO₃

Question 56

56. Metals belonging to the same group in the periodic table are

Answer

Magnesium and barium

Answer

Magnesium and sodium

Answer

Magnesium and potassium

Answer

Magnesium and copper

Question 57

57. Which of the following compounds has the lowest anion to cation size ratio?

Question 58

58. H₃BO₃ is a

Answer

Monobasic acid

Answer

Tribasic acid

Answer

Dibasic acid

Answer

None of these

Question 59

59. Plaster of Paris is a hydrate of

Question 60

60. Sodium metal cannot be stored under

Answer

Kerosene oil

Question 61

61. The principle constituent of pyrex glass is

Question 62

62. Which is the chemical formula of mica?

Answer

K2HAL(SiO₄)₃

Answer

KH₂Al₃(SiO₄)₃

Answer

NaAlSiO₄. 3H₂O

Answer

NaKSiO₄. 10H₂O

Question 63

63. One of the outstanding features of boron is its ability to form

Answer

Molecular crystals

Answer

Semiconductors

Answer

Molecular addition compounds

Answer

Ionic compounds

Question 64

64. Which element is present in excess in skeletal material?

Answer 144

Al₂O₃. H₂O

Answer 145

Al₂O₃.₂H₂O

Answer 146

Na₃ALF₆

Answer 147

Na₂ CO₃

Answer 148

Carbrandum

Answer 149

Aluminum hydroxide

Answer 150

Sodium tetra aluminate

Answer 151

Sodium meta-aluminate

Answer 152

Aluminum oxide

Answer 153

White crystalline sublime solid

Answer 154

White amorphous solid

Answer 155

White crystalline solid

Answer 156

None of these

Answer 157

Amphoteric

Answer 158

Acidic solution

Answer 159

Alkaline earth metals

Answer 160

Alkali metals

Answer 161

Metalloids

Answer 162

Readily soluble in cold water

Answer 163

Sparingly soluble in cold water but readily soluble in hot water

Answer 164

Highly soluble in water at all temperatures.

Answer 165

Sparingly soluble in cold water at all temperatures

Answer 166

Na₂B₄O₇. 10H₂O

Answer 167

Na₂B₄O₇

Answer 168

Na₂B₄O₇.5H₂O

Answer 169

Na₂B₃O₆. 10H₂O

Answer 170

Na₃AlF₆

Answer 171

H₂Mg₃(SiO₃)₄

Answer 172

Al₂F₂SiO₄

Answer 173

Al has larger radius

Answer 174

Al has greater ionization potential

Answer 175

Incomplete p-subshell

Answer 176

High charge in nucleus

Answer 177

Washing soda

Answer 178

Plaster of Paris

Answer 179

Baking soda

Answer 180

Caustic soda

Answer 181

Baryata solution

Answer 182

Caustic potash

Answer 183

Slaked lime

Answer 184

Aqueous NaoH

Answer 185

As a general drying agent

Answer 186

In drying of benzene

Answer 187

In drying of alcohols

Answer 188

In drying of ammonia solution

Answer 189

Calcium oxide

Answer 190

Calcium bicarbonate

Answer 191

Calcium hydroxide

Answer 192

Calcium carbonate

Answer 193

Haemoglbin

Answer 194

Chlorophyll

Answer 195

It has only one electron in the outermost orbit

Answer 196

It is a soft alkali metal

Answer 197

It gives hydrogen with water

Answer 198

It has mobile electrons

Answer 199

Proper growth of plants

Answer 200

Soil porosity

Answer 201

Alkalinity of soil

Answer 202

Na₂S₂O₃

Answer 203

Na₂SO₄

Answer 204

They have smaller size

Answer 205

They have greater atomic size

Answer 206

They are more reactive

Answer 207

Refraction between aluminum and oxygen is endothermic

Answer 208

As compared to aluminum, iron has greater affinity for oxygen

Answer 209

Reaction between iron and oxygen is endothermic

Answer 210

As compared to iron, aluminum has greater affinity for oxygen

Answer 211

None of these

Answer 212

Al₂O₃. 2H₂O

Answer 213

Al₂O₃. SiF₄

Answer 214

Al₂O₃. 2SiO₂. 2H₂O

Answer 215

Its powder form reacts with O₂ and N₂ of air at 800C

Answer 216

None is correct

Answer 217

It reacts with oxygen of air at high temperature (2000c)

Answer 218

It reacts readily with oxygen of the air at room temperature

Answer 219

Na₂CO₃. H₂O

Answer 220

Na₂B₄O₇

Answer 221

All have same products

Answer 222

Li, Mg, Ca

Answer 223

Li, Na, Be

Answer 224

More soluble in hot water

Answer 225

Soluble only in organic solvents

Answer 226

More soluble in cold water

Answer 227

Insoluble in water

Answer 228

H₂B₄O₇

Answer 229

H₆B₄O₉

Answer 230

Pb(OH)₂.2PbCO₃

Answer 231

Na₂CO₃

Answer 232

None of these

Answer 233

Low melting

Answer 234

Green in colour

Answer 235

Heat resistant

Answer 236

Used to prepare chemical garden

Answer 237

Their atomic size decreases

Answer 238

The stability of +2 oxidation state increases

Answer 239

Their ionization energy increases

Answer 240

Their metallic character decreases

Answer 241

Na₂B₄O₇

Answer 242

Na₂HBO₃

Answer 243

Na₃BO₃

Answer 244

Limestone, gypsum and alumina

Answer 245

Limestone, clay and gypsum

Answer 246

Limestone, gypsum and sand

Answer 247

Limestone, clay and sand

Answer 248

Fe form mono and divalent ions

Answer 249

Oxygen forms a protective reaction easily with water

Answer 250

It is a noble metal

Answer 251

Iron undergoes reaction easily with water

Answer 252

NaOH. B₂O₃

Answer 253

Na₂B₄O₇. 10H₂O

Answer 254

Na₂B₄O₇. 4G₂O

Answer 255

Ca₂B₆O₁₁. 5H₂O

Answer 256

Acidic oxide

Answer 257

Basic oxide

Answer 258

It does not exists

Answer 259

Amphoteric oxide

Answer 260

Remain constant

Answer 261

Do not show definite trend

Answer 262

High ionization potential

Answer 263

High nuclear charge and ionization

Answer 264

High nuclear charge

Answer 265

None of these

Answer 266

Na₂CO₃. 10H₂O

Answer 267

Na₂CO₃. 3H₂O

Answer 268

Na₂CO₃. 7H₂O

Answer 269

Na₂CO₃.

Answer 270

Molten NaCl

Answer 271

Square planar

Answer 272

None of these

Answer 273

Irregular tetrahedron

Answer 274

Square pyramid (carbon at apex)

Answer 275

Low density

Answer 276

Low electro negativity

Answer 277

Low atomic volume

Answer 278

Low ionization energy

Answer 279

Basic lead carbonate

Answer 280

Acidic lead carbonate

Answer 281

Basic lead hydroxide

Answer 282

Basic lead acetate

Answer 283

1s2 2s2 2p6 3s2 3p6 4s2 3d1

Answer 284

1s2 2s2 2p3

Answer 285

1s2 2s2 2p4

Answer 286

1s2 2s2 2p6 3s2 3p1

Answer 287

Na₂CO₃

Answer 288

Sodium sulphate

Answer 289

Zinc sulphate

Answer 290

Potassium sulphate

Answer 291

Barium sulphate

Answer 292

HPO₄.4H₂O

Answer 293

Na(NH₄)HPO₄.4H₂O

Answer 294

Na(NH₄). H₂O

Answer 295

K(NH₄)HPO₃. 2H₂O

Answer 296

Colemanite

Answer 297

Boric acid

Answer 298

Calcium carbonate

Answer 299

Atomic radii

Answer 300

Atomic volume

Answer 301

Electropositivity

Answer 302

Endothermic reaction

Answer 303

Exothermic reaction

Answer 304

Neither exothermic nor endothermic

Answer 305

Fr, Li, Rb, K, Na, Cs

Answer 306

Na, K, Li, Rb, Fe, Cs

Answer 307

Li, Na, K, Rb, Cs, Fr

Answer 308

Li, Na, Cs, K, Rb, Fr

Answer 309

Could not apply

Answer 310

f – only

Answer 311

Both d – and f –

Answer 312

d – only

Answer 313

s – or – p

Answer 314

Al₂O₃. 2H₂O

Answer 315

None of these

Answer 316

Al₂O₃. SiF₄

Total Questions:	155
Time Allowed:	60 Minutes
Total Marks:	155
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