Chemistry S-Block Elements Online Mcqs Test

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Question 1

1. The formula of Nitre is

Answer

Na₂CO₃

Question 2

2. The formula of sodium meta borate is

Answer

Na₂B₄O₇

Answer

Na₃BO₃

Question 3

3. Substance which is found in dried up lakes of Tibet and California is

Answer

Boric acid

Answer

Calcium carbonate

Answer

Colemanite

Question 4

4. Which of the following is most dense?

Question 5

5. Which one is formula of borax?

Answer

NaOH. B₂O₃

Answer

Na₂B₄O₇. 4G₂O

Answer

Ca₂B₆O₁₁. 5H₂O

Answer

Na₂B₄O₇. 10H₂O

Question 6

6. Which of the following properties is not true for an alkali metal?

Answer

Low electro negativity

Answer

Low ionization energy

Answer

Low density

Answer

Low atomic volume

Question 7

7. The word alkali means

Question 8

8. Washing soda has formula

Answer

Na₂CO₃. 10H₂O

Answer

Na₂CO₃.

Answer

Na₂CO₃. 3H₂O

Answer

Na₂CO₃. 7H₂O

Question 9

9. Which of the most basic of the following?

Question 10

10. Sodium reacts with water more vigorously than lithium because

Answer

It is a metal

Answer

It has higher atomic weight

Answer

It is more electronegative

Answer

It is more electropositive

Question 11

11. Which is the formula of Chili Salt Peter?

Answer

Na₂So₄

Question 12

12. Alkali metal hydroxides are stable to heat except

Question 13

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

Answer

Smaller ionic radii

Answer

High melting point

Answer

Lower ionization energy

Answer

Greater hardness

Question 14

14. Which of the following is most abundant alkali metal in combined state in nature?

Answer

d – only

Answer

Both d – and f –

Answer

s – or – p

Answer

f – only

Question 15

15. Alkali earth metals have two electrons outermost

Question 16

16. Gypsum is applied to the soil as a source of

Answer

Could not apply

Question 17

17. Mica and bauxite are ores of

Question 18

18. Which is the most amphoteric?

Question 19

19. Which of the following sulphates is not soluble in water?

Answer

Zinc sulphate

Answer

Barium sulphate

Answer

Sodium sulphate

Answer

Potassium sulphate

Question 20

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

Question 21

21. Galena is an ore of

Question 22

22. Magnesium keeps on burning in

Answer

N₂ as well as CO₂

Question 23

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

Question 24

24. Bleaching powder is a compound having a formula

Question 25

25. Silicon is an important constituent of

Answer

Haemoglbin

Answer

Chlorophyll

Question 26

26. 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 27

27. White lead is

Answer

Basic lead carbonate

Answer

Basic lead hydroxide

Answer

Basic lead acetate

Answer

Acidic lead carbonate

Question 28

28. The elements which belong to group IIIA are called

Answer

F – block

Answer

S – block

Answer

P – block

Answer

D – block

Question 29

29. The elements having highest melting point is

Question 30

30. Boric acid cannot be used

Answer

For enamels and glazes

Answer

For washing of eyes

Answer

In soda bottles

Answer

An antiseptic medicine

Question 31

31. The chemical composition of white lead is

Answer

Na₂CO₃

Answer

Pb(OH)₂.2PbCO₃

Question 32

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

Question 33

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

Question 34

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

Question 35

35. Red lead is

Question 36

36. 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 37

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

Answer

Carbrandum

Question 38

38. BF₃ acts as acid according to the concept of

Question 39

39. Which of the following is monovalent?

Answer

Alkaline earth metals

Answer

Metalloids

Answer

Alkali metals

Question 40

40. H₃BO₃ is a

Answer

Monobasic acid

Answer

Dibasic acid

Answer

None of these

Answer

Tribasic acid

Question 41

41. Which halide has highest melting point?

Question 42

42. Anodizing of Al is said when

Answer

Aluminum obtained at anode

Answer

Aluminum coated electrically with aluminum oxide

Answer

Aluminum allay containing 95% Al

Answer

Aluminum prepared electrolytically

Question 43

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

Question 44

44. The element having highest electronegativity among the following is

Question 45

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

Answer

Sr(NO₃)₂

Answer

Be(NO₃)₂

Answer

Mg(NO₃)₂

Question 46

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

Answer

Na₂B₄O₇

Answer

Na₂B₄O₇.5H₂O

Answer

Na₂B₄O₇. 10H₂O

Answer

Na₂B₃O₆. 10H₂O

Question 47

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

Answer

None of these

Question 48

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

Answer

To produce alloy

Answer

As nitro meter

Answer

To remove air bubbles from molten metal

Answer

As insulator

Question 49

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

Question 50

50. Which metal is protected by a layer of its own oxide?

Question 51

51. The elements which are very abundant I earth are

Question 52

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

Question 53

53. 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 ionization energy increases

Answer

Their atomic size decreases

Answer

The stability of +2 oxidation state increases

Answer

Their metallic character decreases

Question 54

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

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

Answer

Its empirical formula is KAl(SO₄). 12H₂O

Question 55

55. The chief are of aluminum is

Answer

Na₃ALF₆

Answer

Al₂O₃. H₂O

Answer

Al₂O₃.₂H₂O

Question 56

56. What is true about reactivity of aluminum?

Answer

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

Answer

It reacts readily with oxygen of the air at room temperature

Answer

None is correct

Answer

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

Question 57

57. Chrome yellow has a formula

Question 58

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

Answer

Carbon is non-metal while silicon is semi-metal

Answer

CO2 is an independent molecule while SiO2 has network covalent structure

Answer

CO2 forms multiple bond while silicon does not form multiple bonds

Answer

Silicon has all sigma bonds

Question 59

59. Choose the number of group of periodic table to which alkali metals belong to

Question 60

60. The oxides of born and silicon are

Answer

Amphoteric

Answer

Acidic solution

Question 61

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

Answer

Baeyer’s process

Answer

Hoop’s process

Answer

Serpeck’s process

Answer

Electrolytic process

Question 62

62. Which is formula of orthoboric acid?

Answer

H₆B₄O₉

Answer

H₂B₄O₇

Question 63

63. Ordinary window glass is a mixture of

Answer

Na₂SiO₃ and SiO₂

Answer

Na₂SiO₃ and CaSiO₃

Answer

Na₂O and SiO₂

Answer

Na₂CiO₃ and CO₂

Question 64

64. With the increase in atomic weights, melting points of the alkali metals

Answer

Do not show definite trend

Answer

Remain constant

Answer 116

Amphoteric

Answer 117

None of these

Answer 118

None of these

Answer 119

As compared to aluminum, iron has greater affinity for oxygen

Answer 120

Refraction between aluminum and oxygen is endothermic

Answer 121

As compared to iron, aluminum has greater affinity for oxygen

Answer 122

Reaction between iron and oxygen is endothermic

Answer 123

Diffusion of sodium ions

Answer 124

Existence of body centered cubic lattice

Answer 125

Oscillation of loose electrons

Answer 126

Excitation of free protons

Answer 127

Baryata solution

Answer 128

Slaked lime

Answer 129

Caustic potash

Answer 130

Caustic soda

Answer 131

Sodium metal

Answer 132

Sodium carbonate

Answer 133

Sodium hydroxide

Answer 134

Sodium bicarbonate

Answer 135

Oxygen forms a protective reaction easily with water

Answer 136

Fe form mono and divalent ions

Answer 137

It is a noble metal

Answer 138

Iron undergoes reaction easily with water

Answer 139

It is a conductor of heat

Answer 140

It is a conductor of electricity

Answer 141

It is not true

Answer 142

It is a good reflector of radiant energy

Answer 143

Na₂CO₃. H₂O

Answer 144

Na₂B₄O₇

Answer 145

Na₂HBO₃

Answer 146

Na₂B₄O₇

Answer 147

Na₃BO₃

Answer 148

Limestone, gypsum and sand

Answer 149

Limestone, clay and sand

Answer 150

Limestone, gypsum and alumina

Answer 151

Limestone, clay and gypsum

Answer 152

Kerosene oil

Answer 153

Na₂co₃

Answer 154

In drying of benzene

Answer 155

As a general drying agent

Answer 156

In drying of alcohols

Answer 157

In drying of ammonia solution

Answer 158

Dehydration

Answer 159

Hydration to yield another hydrate

Answer 160

Combination with atmospheric CO₂

Answer 161

Oxidation with atmospheric oxygen

Answer 162

Green in colour

Answer 163

Low melting

Answer 164

Used to prepare chemical garden

Answer 165

Heat resistant

Answer 166

Giving out water

Answer 167

Combining with water

Answer 168

Giving off CO₂

Answer 169

Changing into CaCO₃

Answer 170

Endothermic reaction

Answer 171

Neither exothermic nor endothermic

Answer 172

Exothermic reaction

Answer 173

Lime stone and silica

Answer 174

Clay and silica

Answer 175

Lime stone and clay

Answer 176

Lime stone and gypsum

Answer 177

It gives hydrogen with water

Answer 178

It is a soft alkali metal

Answer 179

It has only one electron in the outermost orbit

Answer 180

It has mobile electrons

Answer 181

None of these

Answer 182

Irregular tetrahedron

Answer 183

Square pyramid (carbon at apex)

Answer 184

Square planar

Answer 185

Al₂O₃. 2SiO₂. 2H₂O

Answer 186

Al₂O₃. SiF₄

Answer 187

Al₂O₃. 2H₂O

Answer 188

Al₂O₃. 2H₂O

Answer 189

Al₂O₃. SiF₄

Answer 190

None of these

Answer 191

Na₂ CO₃

Answer 192

Carbon atoms of each plane have sp²

Answer 193

Carbon atoms have covalent bonds

Answer 194

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

Answer 195

It has delocalized mobile electron

Answer 196

KH₂Al₃(SiO₄)₃

Answer 197

NaKSiO₄. 10H₂O

Answer 198

NaAlSiO₄. 3H₂O

Answer 199

K2HAL(SiO₄)₃

Answer 200

Hg₂Cl₂

Answer 201

Readily soluble in cold water

Answer 202

Sparingly soluble in cold water at all temperatures

Answer 203

Highly soluble in water at all temperatures.

Answer 204

Sparingly soluble in cold water but readily soluble in hot water

Answer 205

Sodium sulphate

Answer 206

Potassium sulphate

Answer 207

Barium sulphate

Answer 208

Zinc sulphate

Answer 209

Down process

Answer 210

Nelson process

Answer 211

Castner process

Answer 212

Solvay process

Answer 213

Atomic volume

Answer 214

Atomic radii

Answer 215

Electropositivity

Answer 216

Calcium bicarbonate

Answer 217

Calcium oxide

Answer 218

Calcium hydroxide

Answer 219

Calcium carbonate

Answer 220

Molecular crystals

Answer 221

Semiconductors

Answer 222

Molecular addition compounds

Answer 223

Ionic compounds

Answer 224

Na₂S₂O₃

Answer 225

Na₂SO₄

Answer 226

In tanning of leather

Answer 227

As a mordant is dyeing

Answer 228

As an insecticide

Answer 229

In purification of water

Answer 230

Fr, Li, Rb, K, Na, Cs

Answer 231

Li, Na, Cs, K, Rb, Fr

Answer 232

Na, K, Li, Rb, Fe, Cs

Answer 233

Li, Na, K, Rb, Cs, Fr

Answer 234

K(NH₄)HPO₃. 2H₂O

Answer 235

HPO₄.4H₂O

Answer 236

Na(NH₄)HPO₄.4H₂O

Answer 237

Na(NH₄). H₂O

Answer 238

Coal is the hardest and coke is the softest

Answer 239

Graphite is the hardest which lamp black is the softest

Answer 240

Diamond is the hardest and graphite is the softest

Answer 241

Diamond is the hardest and coke is the softest

Answer 242

Very strongly basic

Answer 243

Weakly basic

Answer 244

Amphoteric

Answer 245

Molten NaCl

Answer 246

Silica or siticates

Answer 247

Only silicates

Answer 248

Hydraulic brakes

Answer 249

Lubricants

Answer 250

Water repellent

Answer 251

Antifreeze

Answer 252

Washing soda

Answer 253

Baking soda

Answer 254

Plaster of Paris

Answer 255

Haber process

Answer 256

Contact process

Answer 257

Hall process

Answer 258

Termite process

Answer 259

None of these

Answer 260

White crystalline solid

Answer 261

White amorphous solid

Answer 262

White crystalline sublime solid

Answer 263

Magnesium and barium

Answer 264

Magnesium and copper

Answer 265

Magnesium and potassium

Answer 266

Magnesium and sodium

Answer 267

Proper growth of plants

Answer 268

Soil porosity

Answer 269

Alkalinity of soil

Answer 270

Sodium tetra aluminate

Answer 271

Aluminum oxide

Answer 272

Sodium meta-aluminate

Answer 273

Aluminum hydroxide

Answer 274

1s2 2s2 2p4

Answer 275

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

Answer 276

1s2 2s2 2p3

Answer 277

1s2 2s2 2p6 3s2 3p1

Answer 278

High nuclear charge and ionization

Answer 279

High ionization potential

Answer 280

None of these

Answer 281

High nuclear charge

Answer 282

Al₂F₂SiO₄

Answer 283

H₂Mg₃(SiO₃)₄

Answer 284

Na₃AlF₆

Answer 285

Sodium meta aluminate

Answer 286

Aluminum peroxide

Answer 287

Sodium aluminum hydride

Answer 288

Sodium aluminum hydroxide

Answer 289

First group

Answer 290

Fifth group

Answer 291

Third group

Answer 292

First transition series

Answer 293

Noble gases

Answer 294

More soluble in hot water

Answer 295

More soluble in cold water

Answer 296

Insoluble in water

Answer 297

Soluble only in organic solvents

Answer 298

CaCO₃.MgCO₃

Answer 299

CaCl₂.MgCl₂.6H₂O

Answer 300

KCL.MgCL₂.6H₂O

Answer 301

Na₃AIF₆

Answer 302

They have greater atomic size

Answer 303

They have smaller size

Answer 304

They are more reactive

Answer 305

Al has greater ionization potential

Answer 306

High charge in nucleus

Answer 307

Al has larger radius

Answer 308

Incomplete p-subshell

Answer 309

Aqueous NaoH

Answer 310

Amphoteric oxide

Answer 311

It does not exists

Answer 312

Basic oxide

Answer 313

Acidic oxide

Answer 314

Li, Mg, Ca

Answer 315

All have same products

Answer 316

Li, Na, Be

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