Indicators are used to detect the nature of the solution for
A) Acidity
B) Basicity
C) Both A and B
D) None of these

Bases tend to taste …………….. and feel …………
A) sour, pleasant to touch
B) bitter, slippery to touch
C) sour, slippery to touch
D) None of these

Acids turn …………… litmus to ………………..litmus
A) red, red
B) blue, red
C) red, blue
D) blue, blue

Natural indicators are prepared from…..
i) plants
ii) petrochemicals
iii) living organisms
iv) minerals
A) only i
B) both i and ii
C) both i and iii
D) both ii and iv

Synthetic indicator among these
A) Methyl red
B) Phenolphthalein
C) Methyl orange
D) All of these

Match the following.
a) hydrochloric acid — i) H₂SO₄
b) sulphuric acid — ii) CH₃COOH
c) nitric acid — iii) HCl
d) acetic acid — iv) HNO₃
A) a → i, b→ii, c →iii, d → iv
B) a → iii, b →i, c →iv, d → ii
C) a →i, b →iii, c →iv, d → ii
D) a → i, b → iv, c →iii, d → ii

Match the following.
a) Sodium hydroxide — i) Ca(OH)₂
b) Calcium hydroxide — ii) NH₄OH
c) Magnesium hydroxide — iii) Mg(OH)₂
d) Ammonium hydroxide — iv) NaOH
A) a → i, b → ii, c → iii, d → iv
B) a → i,b → iii,c → ii,d → iv
C) a → iv, b → i, c →iii, d → ii
D) a → iv,b → iii,c → ii,d → i

The gas released in this experiment is.,

A) oxygen
B) hydrogen
C) chlorine
D) carbon dioxide

2NaOH + Zn → ………………… + ………………………
A) NaCZ, H₂
B) ZnO₂, NaH₂
C) Na₂ZnO₂, H₂
D) Na₂O, H₂O

More reactive metals react with acids and liberate …………….. gas.
A) O₂
B) H₂
C) Cl₂
D) C0₂

Electromagnetic wave travels with a speed of …………….
A) 3 x 10⁷ m/s
B) 3 x 10⁶ m/s
C) 3 x 10⁸ m/s
D) 3 x 10⁹ m/s

The relation between frequency and wavelength of electromagnetic wave
A) λ ∝ v
B) λ = v
C) λ ∝ 1/v
D) None of these

Red has …………………. wavelength and …………………. frequency.
A) maximum, maximum
B) minimum, maximum
C) maximum, minimum
D) minimum, minimum

Quantum theory was proposed by……………….
A) Einstein
B) Maxwell
C) Max Planck
D) Newton

When an iron rod is heated first it turns to
A) violet
B) red
C) green
D) orange

In this figure magnetic field and electric field are………. each other.

A) parallel to
B) perpendicular to
C) intersect
D) None of these

An emission spectrum consists of, bright spectral lines on a dark background. Which one of the following does not correspond to the bright j spectral lines?
A) Frequency of emitted radiation
B) Wavelength of the emitted radiation
C) Energy of emitted radiation
D) Velocity of light

Match the following:
a) n = 1 — i) L
b) n = 2 — ii) N
c) n = 3 — iii) K
d) n = 4 — iv) M
A) a → i, b → ii, c → iii, d → iv
B) a → iii, b→ i, c → iv, d → ii
C) a → iv, b → iii, c → ii, d→i
D) a → ii, b→ i, c → iii, d → iv

Bohr’s model explains the line spectra of ………
A) H⁺ ion
B) Hatom
C) The atom
D) Li⁺ ion

Match the following:
a) s – orbital — i) dumbell
b) p – orbital — ii) spherical
c) d – orbital — iii) double dumbell
A) a→i, b→ii, c→iii
B) a→iii, b→ii, c→h
C) a→ii, b→i, c→iii
D) a→ii, b→iii, c→i

……………. defined an element as any substance that cannot be decomposed into further simple substance by physical or chemical change.
A) Charles
B) Robert Boyle
C) Avagadro
D) Madam Curie

According to this, every 8th element has similar properties starting from a, given element
A) Dobereiner triad
B) Newlands’ law
C) Mendeleev’s periodic table
D) Modern periodic table

Dobereiner triad failed for …………………..
i) low mass
ii) equal mass
iv) neutral mass

A) Only i
B) both i and iii
C) both i and iv
D) all

Atomic weight = ……………….. x equivalent weight
A) atomic number
B) combining capacity
C) valency
D) both B and C

Mendeleev corrected the atomic weights of
i) Beryllium
ii) Indium
iii) Gold
A) only i
B) only ii
C) both i and ii
D) all of these

The predicted properties of elements Eka boron, Eka aluminium, and Eka silicon were close to the observed properties of the following elements respectively.
A) scandium, gallium, germanium
B) gallium, germanium, scandium
C) gallium, scandium, germanium
D) germanium, gallium, scandium

The set of elements that is not Dobereiner triad from the following
A) Ca, Sr, Ba
B) Cl ,Br, I
C) Mn, Cr, Fe
D) S, Si, Te

A Dobereiner triad in the following is
A) Cl, Br, I
B) H, He, Li
C) H, Na, Cl
D) C,N, O

……………….. found that each element emits a characteristic pattern of X ^ rays when subjected to bombardment by high-energy electrons.
A) Bohr
B) Sommerfeld
C) Mendeleeff
D) Mosley

The number of periods and groups in the modern periodic table ………………..
A) 7, 8
B) 7,18
C) 6,7
D) 5,6