Question

1. The number of electrons in an ion M2+ will be (Atomic number =20)

a. 22 b. 20

c. 18 d. None of these

2. The empirical formula of glucose is

a. C6H6 b. HCHO

c. CH2O d. C6H12O6

3. The number of significant figures in 0.02450.

a. 4

b. 5

c. 6

d. 3

4. Which is not an alkali metal?

a. Na b. Mg

c. Cs d. K

5. The series of hydrogen spectrum which lies in visible region is

a. Lyman b. Balmer

c. Paschen d. Brackett

6. Which electromagnetic wave have maximum wavelength?

a. Radio waves

b. Cosmic rays

c. X-Rays

d. Microwaves

7. How many nodes are present in 3-d orbital?

a. 1

b. 2

c. 3

d. 0

8. An orbital in which n=4, l=2 is expressed as?

a. 4s b. 4p

c. 4d d. 4f

9. One mole of Methane contains:

a. 4 atoms of Hydrogen

b. 6.02 × 1023 atoms of hydrogen

c. 2.408 × 1024 atoms of hydrogen

d. None of these

10. Which molecule has maximum bond angle?

a. H2O

b. CO2

c. NH3

d. CH4​

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