RRB NTPC Chemistry Questions with Answers & Explanations

The most abundant gas in the Earth's atmosphere is

1. AOxygen
2. BNitrogen
3. CArgon
4. DCarbon dioxide

Which gas is known as "laughing gas"?

1. ANitrogen dioxide
2. BAmmonia
3. CNitrous oxide
4. DNitric oxide

Rusting of iron requires

1. AOnly water
2. BCarbon dioxide only
3. COxygen and moisture
4. DOnly oxygen

Plaster of Paris is prepared from

1. ABauxite
2. BLimestone
3. CHaematite
4. DGypsum

The atomic number of an element is the number of

1. AElectrons and neutrons
2. BNeutrons in its nucleus
3. CProtons in its nucleus
4. DNucleons

Galvanisation is the coating of iron with

1. ACopper
2. BTin
3. CChromium
4. DZinc

The chemical formula of common salt is

1. AKCl
2. BNa₂CO₃
3. CNaCl
4. DNaOH

LPG mainly contains

1. ACarbon monoxide
2. BMethane only
3. CEthane and hydrogen
4. DButane and propane

The chemical symbol of gold is

1. AGo
2. BAg
3. CGd
4. DAu

A solution with pH less than 7 is

1. AAcidic
2. BSaline
3. CBasic
4. DNeutral

Washing soda is chemically

1. ACalcium hydroxide
2. BSodium hydroxide
3. CSodium bicarbonate
4. DSodium carbonate

Lemon juice contains

1. ACitric acid
2. BOxalic acid
3. CAcetic acid
4. DFormic acid

The pH of pure water at 25 °C is

1. A14
2. B7
3. C0
4. D5

The gas used in fire extinguishers is

1. AHydrogen
2. BOxygen
3. CNitrogen dioxide
4. DCarbon dioxide

The main ore of aluminium is

1. AHaematite
2. BGalena
3. CCinnabar
4. DBauxite

CNG mainly contains

1. AButane
2. BPropane
3. CEthylene
4. DMethane

The main ore of aluminium is

1. ABauxite
2. BHaematite
3. CCinnabar
4. DGalena

Which metal is liquid at room temperature?

1. ASodium
2. BMercury
3. CAluminium
4. DLead