Section – III
CHEMISTRY
Q). Quick lime + water—–>’X’
The chemical formula of the product ‘X’ is
A) CaCl2
B) CaO
C) Ca(OH)2
D) CaCO3
Q). Which of the following is not a correct symbol, for expressing characteristics of substance in a chemical equation?
A) s = solid
B) l = liquid
C) g = gas
D) p = precipitate
Q). In the below equation, the values of ‘x’ and ‘y’ are:
C3H8 + ’x’O2 ‘y’ CO2 + 4H2O
A) 5,6
B) 5,3
C) 3,5
D) 6,5
Q). Which one of the following is not a base?
A) HCOOH
B) NaOH
C) KOH
D) Mg(OH)2
Q). When a metal carbonate reacts with acid, the products are
A) Salt + H3O+
B) Salt + H2O + CO2
C) Salt + H2
D) Salt + H2O + H2
Q). On mixing with water, plaster of paris turns into
A) CuSO4 . 5H2O
B) CaSO4 . 2H2O
C) CuSO4
D) CaSO4. 1/2h2O
Q). Tooth decay starts when the ‘pH’ of the mouth is
A) below 5.5
B) between 5.5 – 7
C) between 7 -7.5
D) beyond 7.5
Q). ‘n’ and T values for the electron in ‘2p’ subshell are
A) n = 2, l = 0
B) n = 1, l = 0
C) n = 2, l = 1
D) n = 1, l = 1
Q). Which element has the electronic configuration 1s2 2s22p63s23p5?
A) Si
B) S
C) P
D) Cl
Q). The maximum number of electrons in a subshell is given by
A) 2 (2l + 1)
B) 2l+ 1
C) n + l
D) 2 n2