Indian army has published the notification for SSC Tech 56 men and SSC Tech 27 women for the course commencing at OTA Chennai from April 2021
Which of the following is the strongest base?
NH3
AsH3
SbH3
BiH3
Metal X forms amphoteric oxide. This means ________
Oxide of X is only acidic
Oxide of X is only basic
Oxide of X is neutral
Oxide of X can be both acidic or basic
Match the correct substance that are used to neutralize effect of column A
A. Ant sting I. Vinegar
B. Wasp Sting II. Put skin in running water
C. Acidity in stomach III. Baking soda
D. Acid fall on skin IV. Milk of magnesia
A - III, B - I, C - IV, D - II
A - I, B - II, C - III, D - IV
A - IV, B - I, C - II, D - III
A - II, B - IV, C - I, D - III
You have phenolphthalein solution in three test tubes A, B and C. On putting 2-3 drops of dilute hydrochloric acid in A, a solution of sodium hydroxide in B and distilled water in C, if you immediately observe the colour of the solution in each test tube, you will find that the solution in test tube
A is colourless, in B pink and in C colourless
A is pink, in B pale green and in c colourless
A is colourless, in B colourless and in C pink
A is pale green, in B pink and in C pink
Identify the incorrect statement.
a. Acids are sour in taste whereas bases are bitter in taste and soapy to touch.
b. Acids turn blue litmus red and bases turn red litmus blue.
c. Solutions of substances that show different colours in acidic, basic and neutral solutions are called indicators.
d. An acid and a base neutralise each other to form a salt and a salt is always neutral.
a, d
c
b, c
d
Which one of the following is an organic acid ?
Sulphuric acid
Carbonic acid
Oxalic acid
Nitric acid
You have three test tubes X, Y and Z half-filled with different solutions, as X is filled with sodium chloride solution, Y is filled with sodium hydroxide solution and Z is filled with dilute hydrochloric acid. On adding one drop of phenolphthalein solution to each of the above solutions, you would observe the solutions in the test tubes as:
X is colourless; Y is pale green and Z is pink
X is colourless; Y is pink and Z is colourless
X is pink; Y is pink and Z is colourless
X is pale green; Y is colourless and Z is red
Why does a turmeric solution turn red when it come in contact with soap?
Soap solution is acidic
The pH is very low
Soap solution is basic
Natural dyes are added
The number of water molecules associated with copper sulphate molecule to form crystals is
2
4
5
6
Which of the following is weakest Lewis Base?
OH-
H-
HCO3-
Cl-
