Chemistry S-Block Elements Online Mcqs Test

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Question 1

1. Boric acid cannot be used

Answer

For enamels and glazes

Answer

An antiseptic medicine

Answer

For washing of eyes

Answer

In soda bottles

Question 2

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

Answer

Antifreeze

Answer

Lubricants

Answer

Water repellent

Answer

Hydraulic brakes

Question 3

3. Potassium is kept in

Question 4

4. Amongst the metals Be, Mg, Ca and Sr of group 2 of the periodic table, the least ionic chloride would be formed by

Question 5

5. Cesium oxide will be

Answer

Weakly basic

Answer

Amphoteric

Answer

Very strongly basic

Question 6

6. Born is soil has been considered micronutrient for

Answer

Proper growth of plants

Answer

Soil porosity

Answer

Alkalinity of soil

Question 7

7. The formula of calcium cyanamide is

Question 8

8. Bleaching action of bleaching powder is due to the liberation of

Question 9

9. Which is the chemical formula of mica?

Answer

KH₂Al₃(SiO₄)₃

Answer

K2HAL(SiO₄)₃

Answer

NaKSiO₄. 10H₂O

Answer

NaAlSiO₄. 3H₂O

Question 10

10. 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

On heating it melts in its water of crystallization

Answer

Its aqueous sol. Is basic in nature

Question 11

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

Answer

Na₂co₃

Question 12

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

Answer

To remove air bubbles from molten metal

Answer

As nitro meter

Answer

As insulator

Answer

To produce alloy

Question 13

13. The aqueous solution of potash alum is

Answer

None of these

Question 14

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

Answer

Noble gases

Question 15

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

Answer

Lime stone and gypsum

Answer

Lime stone and silica

Answer

Lime stone and clay

Answer

Clay and silica

Question 16

16. Which of the following conceivable structures for CCl₄ will have a zero dipole moment?

Answer

None of these

Answer

Square pyramid (carbon at apex)

Answer

Irregular tetrahedron

Answer

Square planar

Question 17

17. Plaster of Paris hardens by

Answer

Giving off CO₂

Answer

Changing into CaCO₃

Answer

Giving out water

Answer

Combining with water

Question 18

18. Which of the following alkali metal hydroxides is the strongest base?

Question 19

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

Answer

Fifth group

Answer

First group

Answer

First transition series

Answer

Third group

Question 20

20. Which of the following is most dense?

Question 21

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

Question 22

22. Which of the following statements is correct with respect to the property of elements with increase in atomic number in the carbon family (group 14)?

Answer

Their atomic size decreases

Answer

The stability of +2 oxidation state increases

Answer

Their metallic character decreases

Answer

Their ionization energy increases

Question 23

23. Causticisation process is used for the preparation of

Answer

Slaked lime

Answer

Caustic soda

Answer

Baryata solution

Answer

Caustic potash

Question 24

24. Leblanc process is employed in the manufacture of

Answer

Plaster of Paris

Answer

Baking soda

Answer

Washing soda

Question 25

25. Chrome yellow has a formula

Question 26

26. Setting of Plaster of Paris involves

Answer

Combination with atmospheric CO₂

Answer

Hydration to yield another hydrate

Answer

Dehydration

Answer

Oxidation with atmospheric oxygen

Question 27

27. Which is the chemical formula of zircon?

Answer

Na₃AlF₆

Answer

Al₂F₂SiO₄

Answer

H₂Mg₃(SiO₃)₄

Question 28

28. Solid CO₂ (dry ice) has a structure just like

Answer

None of these

Question 29

29. The principle constituent of pyrex glass is

Question 30

30. Which is the most amphoteric?

Question 31

31. Aluminum reacts with caustic soda to form

Answer

Aluminum hydroxide

Answer

Sodium tetra aluminate

Answer

Sodium meta-aluminate

Answer

Aluminum oxide

Question 32

32. Silicon is found in nature in the form of

Answer

Silica or siticates

Answer

Only silicates

Question 33

33. NaNO₃ decomposes on heating at high temperature to give

Question 34

34. The metal which is used in thermite process because of its activity is

Question 35

35. Point out one of the following which shows moderate electrical conductivity:

Answer

Carbrandum

Question 36

36. In which of the following elements + 1 oxidation state is more stable than +3

Question 37

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

Question 38

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

Answer

Magnesium oxide

Answer

Zinc oxide

Answer

Nitrogen pent oxide

Answer

Aluminum oxide

Question 39

39. What is true about solubility of orthoboric acid?

Answer

Highly soluble in water at all temperatures.

Answer

Sparingly soluble in cold water at all temperatures

Answer

Sparingly soluble in cold water but readily soluble in hot water

Answer

Readily soluble in cold water

Question 40

40. The common mineral of alkali metal sodium is borax which has formula.

Answer

Na₂B₄O₇

Answer

Na₂B₄O₇.5H₂O

Answer

Na₂B₃O₆. 10H₂O

Answer

Na₂B₄O₇. 10H₂O

Question 41

41. Choose the correct statement

Answer

Graphite is the hardest which lamp black is the softest

Answer

Coal is the hardest and coke is the softest

Answer

Diamond is the hardest and coke is the softest

Answer

Diamond is the hardest and graphite is the softest

Question 42

42. Which of the following gases burns with a blue flame?

Question 43

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

Answer

Magnesium and copper

Answer

Magnesium and barium

Answer

Magnesium and sodium

Answer

Magnesium and potassium

Question 44

44. Which halide has highest melting point?

Question 45

45. BF₃ acts as acid according to the concept of

Question 46

46. The chief are of aluminum is

Answer

Al₂O₃. H₂O

Answer

Al₂O₃.₂H₂O

Answer

Na₃ALF₆

Question 47

47. Which one of the following substances conducts electricity by the movement of ions?

Answer

Molten NaCl

Question 48

48. The most abundant element in III A group in earth crust is?

Question 49

49. Al is more reactive than Fe but Al is less easily corroded than Fe because

Answer

Fe form mono and divalent ions

Answer

Oxygen forms a protective reaction easily with water

Answer

It is a noble metal

Answer

Iron undergoes reaction easily with water

Question 50

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

Question 51

51. Magnesium keeps on burning in

Answer

N₂ as well as CO₂

Question 52

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

Answer

It has delocalized mobile electron

Answer

Carbon atoms have covalent bonds

Answer

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

Answer

Carbon atoms of each plane have sp²

Question 53

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

Question 54

54. First ionization potential of alkaline earth metal is greater than alkali metals because

Answer

They have greater atomic size

Answer

They are more reactive

Answer

They have smaller size

Question 55

55. The elements having highest melting point is

Question 56

56. AlCl₃ exist as dimmer because

Answer

Al has greater ionization potential

Answer

Incomplete p-subshell

Answer

Al has larger radius

Answer

High charge in nucleus

Question 57

57. Which is most abundant alkaline metal in earth crust?

Question 58

58. Borax is a white crystalline solid and it is

Answer

Soluble only in organic solvents

Answer

Insoluble in water

Answer

More soluble in cold water

Answer

More soluble in hot water

Question 59

59. Aluminum oxide is

Answer

Basic oxide

Answer

Amphoteric oxide

Answer

Acidic oxide

Answer

It does not exists

Question 60

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

Answer

Electrolytic process

Answer

Baeyer’s process

Answer

Hoop’s process

Answer

Serpeck’s process

Question 61

61. Choose the element which does not belong to group II A of the periodic table

Question 62

62. Anodizing of Al is said when

Answer

Aluminum coated electrically with aluminum oxide

Answer

Aluminum obtained at anode

Answer

Aluminum prepared electrolytically

Answer

Aluminum allay containing 95% Al

Question 63

63. Dolomite has the composition

Answer

CaCl₂.MgCl₂.6H₂O

Answer

CaCO₃.MgCO₃

Answer

KCL.MgCL₂.6H₂O

Answer

Na₃AIF₆

Question 64

64. The process of aluminum extraction is called

Answer

Haber process

Answer

Termite process

Answer

Contact process

Answer

Hall process

Answer 136

NaOH. B₂O₃

Answer 137

Na₂B₄O₇. 10H₂O

Answer 138

Na₂B₄O₇. 4G₂O

Answer 139

Ca₂B₆O₁₁. 5H₂O

Answer 140

Al₂O₃. 2SiO₂. 2H₂O

Answer 141

Al₂O₃. SiF₄

Answer 142

Al₂O₃. 2H₂O

Answer 143

Kerosene oil

Answer 144

Castner process

Answer 145

Down process

Answer 146

Nelson process

Answer 147

Solvay process

Answer 148

Sodium bicarbonate

Answer 149

Sodium carbonate

Answer 150

Sodium metal

Answer 151

Sodium hydroxide

Answer 152

Haemoglbin

Answer 153

Chlorophyll

Answer 154

Na₂B₄O₇

Answer 155

Na₃BO₃

Answer 156

Na₂HBO₃

Answer 157

Ca(HCO₃)₂

Answer 158

Aqueous NaoH

Answer 159

Li, Na, Be

Answer 160

Li, Mg, Ca

Answer 161

All have same products

Answer 162

None of these

Answer 163

Al₂O₃. 2H₂O

Answer 164

Al₂O₃. SiF₄

Answer 165

Na₂S₂O₃

Answer 166

Na₂SO₄

Answer 167

Neither exothermic nor endothermic

Answer 168

Endothermic reaction

Answer 169

Exothermic reaction

Answer 170

Low ionization energy

Answer 171

Low electro negativity

Answer 172

Low atomic volume

Answer 173

Low density

Answer 174

Na₂CO₃

Answer 175

Pb(OH)₂.2PbCO₃

Answer 176

Both d – and f –

Answer 177

s – or – p

Answer 178

d – only

Answer 179

f – only

Answer 180

In tanning of leather

Answer 181

As an insecticide

Answer 182

In purification of water

Answer 183

As a mordant is dyeing

Answer 184

It has only one electron in the outermost orbit

Answer 185

It has mobile electrons

Answer 186

It is a soft alkali metal

Answer 187

It gives hydrogen with water

Answer 188

None of these

Answer 189

Amphoteric

Answer 190

H₂B₄O₇

Answer 191

H₆B₄O₉

Answer 192

Na₂So₄

Answer 193

Electropositivity

Answer 194

Atomic radii

Answer 195

Atomic volume

Answer 196

It reacts readily with oxygen of the air at room temperature

Answer 197

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

Answer 198

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

Answer 199

None is correct

Answer 200

Calcium carbonate

Answer 201

Calcium bicarbonate

Answer 202

Calcium hydroxide

Answer 203

Calcium oxide

Answer 204

High melting point

Answer 205

Lower ionization energy

Answer 206

Smaller ionic radii

Answer 207

Greater hardness

Answer 208

Na₂CO₃. 10H₂O

Answer 209

Na₂CO₃. 7H₂O

Answer 210

Na₂CO₃.

Answer 211

Na₂CO₃. 3H₂O

Answer 212

Sodium aluminum hydroxide

Answer 213

Sodium meta aluminate

Answer 214

Aluminum peroxide

Answer 215

Sodium aluminum hydride

Answer 216

Na₂CO₃

Answer 217

Na₂SiO₃ and CaSiO₃

Answer 218

Na₂CiO₃ and CO₂

Answer 219

Na₂SiO₃ and SiO₂

Answer 220

Na₂O and SiO₂

Answer 221

It is a conductor of heat

Answer 222

It is a good reflector of radiant energy

Answer 223

It is not true

Answer 224

It is a conductor of electricity

Answer 225

Acidic lead carbonate

Answer 226

Basic lead carbonate

Answer 227

Basic lead hydroxide

Answer 228

Basic lead acetate

Answer 229

Calcium carbonate

Answer 230

Boric acid

Answer 231

Colemanite

Answer 232

White amorphous solid

Answer 233

None of these

Answer 234

White crystalline sublime solid

Answer 235

White crystalline solid

Answer 236

Fr, Li, Rb, K, Na, Cs

Answer 237

Li, Na, K, Rb, Cs, Fr

Answer 238

Na, K, Li, Rb, Fe, Cs

Answer 239

Li, Na, Cs, K, Rb, Fr

Answer 240

Semiconductors

Answer 241

Ionic compounds

Answer 242

Molecular crystals

Answer 243

Molecular addition compounds

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

It is more electronegative

Answer 249

It is a metal

Answer 250

It has higher atomic weight

Answer 251

It is more electropositive

Answer 252

Refraction between aluminum and oxygen is endothermic

Answer 253

As compared to iron, aluminum has greater affinity for oxygen

Answer 254

As compared to aluminum, iron has greater affinity for oxygen

Answer 255

Reaction between iron and oxygen is endothermic

Answer 256

CO2 forms multiple bond while silicon does not form multiple bonds

Answer 257

CO2 is an independent molecule while SiO2 has network covalent structure

Answer 258

Carbon is non-metal while silicon is semi-metal

Answer 259

Silicon has all sigma bonds

Answer 260

1s2 2s2 2p6 3s2 3p1

Answer 261

1s2 2s2 2p3

Answer 262

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

Answer 263

1s2 2s2 2p4

Answer 264

Alkali metals

Answer 265

Alkaline earth metals

Answer 266

Metalloids

Answer 267

Amphoteric

Answer 268

Acidic solution

Answer 269

Na₃BO₃

Answer 270

Na₂B₄O₇

Answer 271

P – block

Answer 272

F – block

Answer 273

D – block

Answer 274

S – block

Answer 275

In drying of benzene

Answer 276

As a general drying agent

Answer 277

In drying of ammonia solution

Answer 278

In drying of alcohols

Answer 279

Na₂B₄O₇

Answer 280

Na₂CO₃. H₂O

Answer 281

Mg(NO₃)₂

Answer 282

Sr(NO₃)₂

Answer 283

Be(NO₃)₂

Answer 284

Excitation of free protons

Answer 285

Existence of body centered cubic lattice

Answer 286

Diffusion of sodium ions

Answer 287

Oscillation of loose electrons

Answer 288

Hg₂Cl₂

Answer 289

Do not show definite trend

Answer 290

Remain constant

Answer 291

High nuclear charge and ionization

Answer 292

High nuclear charge

Answer 293

None of these

Answer 294

High ionization potential

Answer 295

Heat resistant

Answer 296

Low melting

Answer 297

Used to prepare chemical garden

Answer 298

Green in colour

Answer 299

Na₂ CO₃

Answer 300

Dibasic acid

Answer 301

None of these

Answer 302

Monobasic acid

Answer 303

Tribasic acid

Answer 304

Zinc sulphate

Answer 305

Barium sulphate

Answer 306

Sodium sulphate

Answer 307

Potassium sulphate

Answer 308

Could not apply

Answer 309

Sodium sulphate

Answer 310

Potassium sulphate

Answer 311

Barium sulphate

Answer 312

Zinc sulphate

Answer 313

Na(NH₄)HPO₄.4H₂O

Answer 314

HPO₄.4H₂O

Answer 315

Na(NH₄). H₂O

Answer 316

K(NH₄)HPO₃. 2H₂O

Total Questions:	155
Time Allowed:	60 Minutes
Total Marks:	155
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Important Chemistry S-Block Elements Question and Answer

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