NTSE SAT Chemistry - Acids, Bases and Salts
Exam Duration: 45 Mins Total Questions : 30
Aqueous solutions of which of the following salts will change the colour of blue litmus to red?
i) KNO3
ii) (NH4)2SO4
iii) Na2CO3
iv) NH4Cl
- (a)
(i) only·
- (b)
(ii) and (iii) only
- (c)
(ii) and (iv) only
- (d)
(i)' (ii) and (iv)
Anhydrous CuSO4 is used for the detection of water vapour. Which property of anhydrous CuSO4 is exploited for the above use?
- (a)
Anhydrous CuSO4 changes from solid state to liquid state in presence of water vapour.
- (b)
Colourless anhydrous CuSO4 changes to blue coloured hydrated CuSO4
- (c)
Blue coloured anhydrous CuSO4 changes to colourless hydrated CuSO4
- (d)
None of the above
Formula of gypsfm is ____
- (a)
CaSO4. 1/2 H20
- (b)
CaSO4.2H2O
- (c)
MgSO4· 2H2O
- (d)
Na2So4. 7H2o
Which of the following is an alkali?
- (a)
CU(OH)2
- (b)
Ca(OH)2
- (c)
KOH
- (d)
Zn(OH)2
When SO3 is dissolved in water the acid forms is
- (a)
H2SO3
- (b)
H2SO4
- (c)
H2S2O7
- (d)
None of these
Acid used in car batteries is
- (a)
HCl
- (b)
H2SO4
- (c)
HNO3
- (d)
CH3COOH
Identify the weak base among the following
- (a)
KOH
- (b)
NaOH
- (c)
Cs(OH)
- (d)
Ca(OH)2
A strong acid in solution is __________
- (a)
mostly molecules
- (b)
mostly ions
- (c)
both molecules and ions
- (d)
mostly water
An acid is ____________
- (a)
a proton donor
- (b)
a proton acceptor
- (c)
an electron donor
- (d)
an electron acceptor
Which is a soluble base in water?
- (a)
Fe(OH)3
- (b)
CU(OH)2
- (c)
Zn(OH)2
- (d)
NaOH
The word acid comes from the Latin word 'acere' which means:
- (a)
Sweet
- (b)
Salty
- (c)
Neutral
- (d)
Sour
Citric acid is found in:
- (a)
Curd
- (b)
Citrus fruits
- (c)
Ascorbic acid
- (d)
Lime water
Tartaric acid is found in:
- (a)
Tamarind
- (b)
Grapes
- (c)
Unripe mangoes
- (d)
All of the above
Calcium hydroxide is found in:
- (a)
Calcium carbonate
- (b)
Calcium chloride
- (c)
Calcium
- (d)
Lime water
Metallic oxides are ___________ in nature, but non-metallic oxides are ____________ in nature. The information in which alternative completes the given statement?
- (a)
neutral, acidic
- (b)
acidic, basic
- (c)
basic, neutral
- (d)
basic, acidic
A student tests a sample drinking water and reports its pH value as 6 at room temperature. Which one of the following might have been added in water?
- (a)
Calcium chloride
- (b)
Sodium chloride
- (c)
Sodium bicarbonate
- (d)
Bleaching powder
Which of the following natural sources contains oxalic acid?
- (a)
lemon
- (b)
orange
- (c)
tomato
- (d)
tamarind
Reaction of an acid with a base is known as
- (a)
decomposition
- (b)
combination
- (c)
redox reaction
- (d)
neutralization
When CO2 is passed through lime water, it turns milky; The milkiness is due to the formation of -
- (a)
CaCO3
- (b)
Ca(OH)2
- (c)
H20
- (d)
CO2
Calcium hydroxide (slaked lime) is used in-
- (a)
Plastics and dyes
- (b)
Fertilizers
- (c)
Antacids
- (d)
White washing
If pH of any solution is equal to zero then solution will be
- (a)
acidic
- (b)
basic
- (c)
neutral
- (d)
none of these
Energy released in neutralisation reaction which occurs between strong acid and strong base is-
- (a)
57.8 kJ
- (b)
57.1 kJ
- (c)
HNO3
- (d)
H2C2P4
The difference in number of water molecules in gypsum and plaster of paris is-
- (a)
5/2
- (b)
2
- (c)
1/2
- (d)
3/2
Basic solutions have
- (a)
Only OH- ions
- (b)
Both H+ and OH- ions but OH- ions concentration is more than H+ ions
- (c)
Only H+ ions
- (d)
Both H+ and OH- ions with OH- ions concentration less than H+ ions.
Brine is an aqueous solution of
- (a)
Sodium hydroxide
- (b)
Sodium oxide
- (c)
Sodium chloride
- (d)
Potassium chloride
The chemical substance used for removal of permanent hardness of water is
- (a)
Bleaching powder
- (b)
Washing soda
- (c)
Baking soda
- (d)
Plaster of Paris.
An aqueous solution of the salt is acidic in nature. Which of the following acids and bases react to give this salt?
- (a)
Strong acid and weak base
- (b)
Strong acid and strong base
- (c)
Weak acid and weak base
- (d)
Weak acid and strong base
Which one of the following will turn red litmus blue
- (a)
Lemon juice
- (b)
Curd
- (c)
Washing soda
- (d)
Vinegar.
Which amongst the following can be used as an antacid?
- (a)
Vinegar
- (b)
Milk of magnesia
- (c)
Calcium hydroxide
- (d)
Sodium hydroxide,
The expected pH of solution of calcium sulphate is
- (a)
Exactly 7
- (b)
Less than 7
- (c)
Between 7-10
- (d)
Above 12
